Derivative works — US Patent 8593888

Defensive Disclosure Document: Advanced Semiconductor Memory Voltage Control Architectures

This document details novel derivative variations of the core concepts presented in US Patent 8,593,888, pertaining to semiconductor memory devices with integrated voltage regulation. The intent of this defensive disclosure is to establish prior art for potential future incremental improvements, thereby rendering them obvious or non-novel, and to strategically broaden the public domain knowledge surrounding efficient voltage management in memory architectures.

The core invention of US Patent 8,593,888 centers on utilizing a single voltage regulator to supply different regulated voltages to a memory cell and/or an associated voltage applying transistor during different operation modes (e.g., write and read), thereby reducing overall circuit area. The following derivative disclosures expand upon these foundational concepts across various technical axes.

Core Claim 1 Derivatives

Claim 1: A semiconductor memory device capable of erasing and writing memory contents in a memory cell using an electric signal, comprising: the memory cell, one regulator, first and second switches, and a voltage applying transistor for applying a voltage to the memory cell, wherein an output of the regulator is coupled to inputs of the first and second switches, an output of the first switch is coupled to a gate of the voltage applying transistor, a voltage is applied from a drain terminal of the voltage applying transistor to a drain terminal of the memory cell, and an output of the second switch is coupled to a gate of the memory cell for application of a voltage.

Derivative 1.1: Material & Component Substitution - High-K Dielectric Memory with GaN Switches

Enabling Description: This variation of Claim 1 utilizes a memory cell fabricated with high-k dielectric materials (e.g., HfO2, ZrO2) in its gate stack to enhance charge retention and endurance, particularly for advanced non-volatile memory types like ferroelectric RAM (FeRAM) or certain resistive RAM (ReRAM) variants. The voltage applying transistor is implemented as a lateral GaN HEMT (High Electron Mobility Transistor) to handle higher drain voltages and currents with lower ON-resistance and faster switching speeds during write operations. The first and second switches are also realized using compact GaN-on-Si power switches (e.g., normally-off p-GaN gate HEMTs), providing efficient and rapid routing of the single regulator's output. The single regulator is a high-frequency, switched-capacitor charge pump capable of generating multiple boosted voltages from a low supply, optimized for GaN gate drive requirements, providing Vreg to the GaN switches. The output of the GaN-based first switch controls the gate of the GaN voltage applying transistor, while the output of the GaN-based second switch directly controls the gate of the high-k dielectric memory cell.

graph TD
    A[Booster Circuit VPP1] --> R(Regulator)
    R -- Vreg --> S1(GaN 1st Switch)
    R -- Vreg --> S2(GaN 2nd Switch)
    S1 --> VAPT(GaN Voltage Applying Transistor Gate)
    B[Booster Circuit VPP2] --> VAPD(GaN Voltage Applying Transistor Drain)
    VAPD --> MC(High-K Dielectric Memory Cell Drain)
    S2 --> MCG(High-K Dielectric Memory Cell Gate)
    MCG --> MC

Derivative 1.2: Material & Component Substitution - Organic TFT Memory with MEMS Switches

Enabling Description: In this embodiment, the memory cell is an organic Thin-Film Transistor (OTFT) based non-volatile memory, leveraging flexible substrates and low-cost manufacturing processes. The voltage applying transistor and switches (first and second) are implemented using Microelectromechanical Systems (MEMS) switches. These MEMS switches offer near-ideal ON/OFF ratios, minimal leakage currents, and high voltage isolation, which are advantageous for the potentially higher operating voltages or specific switching requirements of OTFT memories. The single regulator could be a hybrid analog/digital control unit providing precise, pulsed voltage outputs, which are then routed via the MEMS switches. The output of the MEMS first switch controls the gate of the voltage applying transistor (which could also be an OTFT or a specialized MEMS transistor for voltage application), and the output of the MEMS second switch applies the regulated voltage directly to the gate of the OTFT memory cell. This setup is particularly relevant for flexible electronics or disposable smart devices.

graph TD
    A[Power Supply] --> R(Hybrid Regulator)
    R -- Vreg --> S1(MEMS 1st Switch)
    R -- Vreg --> S2(MEMS 2nd Switch)
    S1 --> VAPT(Voltage Applying Transistor Gate)
    VAPT --> MC(OTFT Memory Cell Drain)
    S2 --> MCG(OTFT Memory Cell Gate)
    MCG --> MC

Derivative 1.3: Operational Parameter Expansion - Cryogenic High-Parallelism Memory Array

Enabling Description: This derivative operates US Patent 8,593,888's core architecture within a cryogenic environment (e.g., 4K-77K) for high-performance computing or quantum computing applications. The single regulator is designed with superconducting or low-temperature CMOS components to maintain stable output voltages and minimize noise at extreme low temperatures. The memory array consists of millions of memory cells, possibly superconducting memory cells or specialized DRAM/SRAM, arranged for massive parallelism. The first and second switches are ultra-low temperature CMOS or single-electron transistor (SET) switches, capable of rapid and precise switching even with minimal thermal energy. The voltage applying transistor is also optimized for cryogenic operation. The system employs dynamic voltage scaling (DVS) to adjust the Vreg output based on the specific cryogenic temperature and the desired write/read speed, which might be in the GHz range for individual cells, utilizing the shared regulator to reduce footprint within the limited cold volume.

graph TD
    A[Cryo Power Supply] --> R(Cryo-Regulator)
    R -- Vreg --> S1(SET 1st Switch)
    R -- Vreg --> S2(SET 2nd Switch)
    S1 --> VAPT(Cryo Voltage Applying Transistor Gate)
    VAPD(Cryo Booster VDD) --> VAPT
    VAPT --> MC(Cryo Memory Cell Drain)
    S2 --> MCG(Cryo Memory Cell Gate)
    MCG --> MC

Derivative 1.4: Operational Parameter Expansion - Ultra-Low Power Energy-Harvesting Memory

Enabling Description: This variation focuses on operating the memory device at ultra-low power levels (e.g., microwatts to nanowatts) for energy-harvesting applications such as wireless sensor nodes or passive RFID tags. The single regulator is a highly efficient boost/buck converter optimized for minimal quiescent current, potentially incorporating a maximum power point tracking (MPPT) algorithm to draw energy from a photovoltaic cell or RF harvester. The memory cell is a non-volatile type, such as MRAM or ReRAM, selected for its low write energy and non-volatility without power. The first and second switches are extremely low-leakage subthreshold CMOS switches or tunnel FETs, minimizing power consumption when inactive. The voltage applying transistor is also a low-power design. The regulator dynamically adjusts its output voltage (Vreg) and operation frequency based on the available harvested energy, prioritizing critical memory operations (e.g., read) under low power conditions and enabling write operations only when sufficient energy is accumulated.

graph TD
    A[Energy Harvester] --> B(MPPT/Power Manager)
    B --> R(Ultra-Low Power Regulator)
    R -- Vreg --> S1(Tunnel FET 1st Switch)
    R -- Vreg --> S2(Tunnel FET 2nd Switch)
    S1 --> VAPT(Low Power V-Apply Transistor Gate)
    VAPT --> MC(MRAM/ReRAM Memory Cell Drain)
    S2 --> MCG(MRAM/ReRAM Memory Cell Gate)
    MCG --> MC

Derivative 1.5: Cross-Domain Application - Neuromorphic Computing Memory Array

Enabling Description: This derivative applies the single-regulator, switched-voltage control concept to a neuromorphic computing memory array, where memory cells function as synaptic weights. The "memory cell" here represents an analog memristor or phase-change memory (PCM) element, whose conductance state is precisely controlled by applied voltages for learning and inference. The single regulator is a high-precision digital-to-analog converter (DAC) integrated with a booster, capable of generating a wide range of analog voltages (Vreg) with fine granularity. The first and second switches are high-speed analog multiplexers, allowing the dynamically adjusted Vreg to be routed to either the gate of a selector transistor (acting as the "voltage applying transistor") or directly to the memristor element's control terminal. This enables efficient setting and reading of synaptic weights in massively parallel arrays, optimizing for different learning algorithms (ee.g., Spike-Timing-Dependent Plasticity, STDP) where precise, varied voltage pulses are critical.

graph TD
    A[Neuromorphic Controller] --> R(High-Precision DAC & Booster)
    R -- Vreg (Synaptic Write/Read Voltage) --> S1(High-Speed Analog MUX 1)
    R -- Vreg (Synaptic Read Voltage) --> S2(High-Speed Analog MUX 2)
    S1 --> VAPT(Selector Transistor Gate)
    VAPT --> MC(Memristor/PCM Memory Cell Drain/Terminal)
    S2 --> MCG(Memristor/PCM Memory Cell Gate/Control)
    MCG --> MC

Derivative 1.6: Cross-Domain Application - Automotive Safety & Event Logging Memory

Enabling Description: This derivative integrates the single-regulator memory system into an automotive Electronic Control Unit (ECU) for critical event logging and safety features (e.g., airbag deployment parameters, crash data, secure firmware logs). The memory cell is a highly reliable Automotive-grade EEPROM or NOR Flash. The single regulator is designed with enhanced electromagnetic compatibility (EMC) and robustness against voltage transients, adhering to automotive safety integrity levels (ASIL). The first and second switches are hardened CMOS switches, ensuring operation across extreme temperature ranges (-40C to +150C) and high vibration environments. In a "first operation mode" (write/logging), the regulator's output is routed via the first switch to the gate of the voltage applying transistor, enabling high-voltage programming. In a "second operation mode" (read/diagnostic), the regulator's output is routed via the second switch to the memory cell gate for reliable data retrieval, even under stressful conditions.

graph TD
    A[ECU Power Mgmt] --> R(Automotive-Grade Regulator)
    R -- Vreg --> S1(Hardened CMOS Switch 1)
    R -- Vreg --> S2(Hardened CMOS Switch 2)
    S1 --> VAPT(Voltage Applying Transistor Gate)
    VAPT --> MC(Automotive EEPROM Cell Drain)
    S2 --> MCG(Automotive EEPROM Cell Gate)
    MCG --> MC

Derivative 1.7: Integration with Emerging Tech - AI-Optimized Adaptive Memory Controller

Enabling Description: An AI-driven optimization engine dynamically adjusts the parameters of the single regulator and the switching logic based on real-time operational data. The memory device incorporates embedded IoT sensors (temperature, voltage, current, error rates) feeding data to an on-chip AI core. The AI analyzes wear-leveling patterns, cell degradation, power consumption, and access latency. Based on this analysis, the AI adjusts the output voltage (Vreg) of the regulator, the timing sequences of the first and second switches, and the operational characteristics of the voltage applying transistor. This allows for adaptive optimization of memory cell endurance, write/read speed, and power efficiency over the device's lifetime, compensating for process variations or environmental changes. For example, during high-temperature operation, the AI might slightly increase Vreg for faster write times, or during low-power standby, it might reduce Vreg for minimal leakage, all while maintaining data integrity.

graph TD
    A[AI Optimization Core] --> R_CTRL(Regulator Control Logic)
    R_CTRL --> R(Adaptive Regulator)
    R --> S1(1st Switch)
    R --> S2(2nd Switch)
    S1 --> VAPT(Voltage Applying Transistor Gate)
    VAPD(Booster VPP2) --> VAPT
    VAPT --> MC(Memory Cell Drain)
    S2 --> MCG(Memory Cell Gate)
    MCG --> MC
    Sensors[On-chip IoT Sensors] --> A
    MC --> Sensors

Derivative 1.8: Integration with Emerging Tech - Blockchain-Secured Immutable Log Memory

Enabling Description: This derivative utilizes the memory device as an immutable log for blockchain applications, such as secure firmware updates, critical transaction records, or hardware provenance tracking. The robust and precise voltage control from the single regulator ensures the integrity of write operations. Each write operation is cryptographically signed and hashed, with the hash stored in the memory cell itself. The "voltage applying transistor" and associated drain voltage control mechanism (via the first switch and regulator) are designed to provide highly specific programming pulses that are difficult to replicate or tamper with without authorization, acting as a physical layer security mechanism. The second switch allows for controlled read access to the memory cell, ensuring that only authorized voltage levels are applied to prevent side-channel attacks or unintentional modification during read. The state of the regulator and switches during critical writes could also be logged on-chain.

graph TD
    A[Blockchain Client] --> T(Trusted Execution Env)
    T --> R_CTRL(Regulator Control)
    R_CTRL --> R(Secure Regulator)
    R --> S1(1st Switch)
    R --> S2(2nd Switch)
    S1 --> VAPT(Secure V-Apply Transistor Gate)
    VAPT --> MC(Immutable Log Memory Cell Drain)
    S2 --> MCG(Immutable Log Memory Cell Gate)
    MCG --> MC
    MC --> Data_Integrity[Data Integrity Check]
    Data_Integrity --> Blockchain_Verify[Blockchain Verifier]

Derivative 1.9: The "Inverse" or Failure Mode - Graceful Degradation Memory

Enabling Description: This derivative implements a graceful degradation strategy for the memory device. Upon detection of increasing bit error rates (BER), voltage supply instability, or memory cell aging (e.g., reduced program/erase cycling capability), a fault management unit (FMU) activates. The FMU modifies the control parameters of the single regulator. Instead of catastrophic failure, the regulator's output voltage (Vreg) for write operations is slightly reduced, and write pulse durations are increased, thereby extending the apparent life of marginal cells at the cost of slower write speeds. For read operations, Vreg to the memory cell gate might be marginally adjusted to enhance sense margin for weakened cells, even if it slightly increases read latency. The first and second switches also operate in a "soft-switch" mode, with slower rise/fall times for their gate signals to minimize stress on aging transistors. This allows the memory to continue functioning reliably, albeit with reduced performance, rather than failing entirely.

graph TD
    A[Fault Management Unit] --> R_CTRL(Regulator Control)
    R_CTRL --> R(Degradation-Aware Regulator)
    R --> S1(Soft 1st Switch)
    R --> S2(Soft 2nd Switch)
    S1 --> VAPT(V-Apply Transistor Gate)
    VAPD(Booster VPP2) --> VAPT
    VAPT --> MC(Aging Memory Cell Drain)
    S2 --> MCG(Aging Memory Cell Gate)
    MCG --> MC
    MC --> Error_Det[Error Detection]
    Error_Det --> A

Derivative 1.10: The "Inverse" or Failure Mode - Ultra-Low Power Read-Only Mode

Enabling Description: This derivative introduces an ultra-low power "Read-Only Mode" (ROM) for the memory device, typically activated during prolonged standby or critical power scarcity. In this mode, the single regulator transitions to a minimum power consumption state, potentially using a different, highly efficient low-dropout regulator (LDO) topology or operating at a very low duty cycle. The first switch (controlling the voltage applying transistor for writes) is permanently disabled or kept off, effectively preventing any write operations. The second switch, however, remains active but is optimized for minimal power draw to apply a reduced Vreg to the memory cell gate, sufficient only for reliable read operations. The voltage applying transistor might be fully switched off or held in a low-leakage state. This ensures that essential configuration data or boot code stored in the memory can still be accessed, even when the overall system power budget is severely restricted.

graph TD
    A[Power Management Unit] --> R_MODE(Regulator Mode Select)
    R_MODE --> R(Low-Power Regulator)
    R -- Vreg (Read-Only) --> S1(1st Switch - Disabled)
    R -- Vreg (Read-Only) --> S2(2nd Switch - Read-Optimized)
    S1 -.-> VAPT(V-Apply Transistor Gate)
    VAPT --X--> MC(Memory Cell Drain)
    S2 --> MCG(Memory Cell Gate)
    MCG --> MC
    PMU --> S1

Core Claim 2 Derivatives

Claim 2: A semiconductor memory device capable of erasing and writing memory contents in a memory cell using an electric signal, comprising: the memory cell, one regulator, second and third switches, and a voltage applying transistor, wherein an output of the regulator is coupled to an input of the second switch and a gate of the voltage applying transistor, a voltage is applied from a drain terminal of the voltage applying transistor to a drain terminal of the memory cell via the third switch, and an output of the second switch is coupled to a gate of the memory cell for application of a voltage.

Derivative 2.1: Material & Component Substitution - Carbon Nanotube FET Memory with Quantum-Dot Regulators

Enabling Description: This variant features memory cells composed of Carbon Nanotube Field-Effect Transistors (CNTFETs) or other nanoscale memory structures that exhibit unique quantum mechanical properties for data storage. The voltage applying transistor is also a CNTFET. The single regulator is a novel "quantum-dot regulator," utilizing arrays of quantum dots to generate highly stable and tunable ultra-low voltage levels (Vreg) with quantum precision, suitable for controlling nanoscale devices. The second and third switches are implemented as Graphene Field-Effect Transistors (GFETs), chosen for their extremely fast switching speeds and high current density at nanoscale. The quantum-dot regulator's output is connected to the input of the GFET second switch and the gate of the CNTFET voltage applying transistor. The third GFET switch controls the application of voltage from the drain of the CNTFET voltage applying transistor to the drain of the CNTFET memory cell. The output of the second GFET switch is connected to the gate of the CNTFET memory cell. This provides precise, low-power control for future nanoscale memory.

graph TD
    A[Quantum Power Source] --> R(Quantum-Dot Regulator)
    R -- Vreg --> S2(GFET 2nd Switch Input)
    R -- Vreg --> VAPT(CNTFET Voltage Applying Transistor Gate)
    B[Booster VPPX] --> VAPD(CNTFET Voltage Applying Transistor Drain)
    VAPD --> S3(GFET 3rd Switch)
    S3 --> MCD(CNTFET Memory Cell Drain)
    S2 --> MCG(CNTFET Memory Cell Gate)
    MCG --> MCD

Derivative 2.2: Material & Component Substitution - Spintronic Memory with Ferroelectric Transistor Switches

Enabling Description: This derivative uses magnetic tunnel junction (MTJ) based Spintronic Memory (MRAM) cells, where resistance states depend on magnetization direction. The voltage applying transistor could be a CMOS device or a specialized spin-injection transistor. The single regulator is a current-mode boost converter, providing precise current pulses for write operations in MRAM. The second and third switches are implemented using Ferroelectric Field-Effect Transistors (FeFETs). FeFETs offer non-volatile switching characteristics, allowing the switch state to be retained without continuous power, which could be beneficial for certain low-power or security-critical applications. The regulator output (Vreg, potentially current-controlled) is routed to the FeFET second switch input and the gate of the voltage applying transistor. The FeFET third switch selectively connects the voltage applying transistor's drain to the MRAM cell's drain, and the FeFET second switch's output controls the MRAM cell's gate for read/write assistance.

graph TD
    A[Current Source] --> R(Current-Mode Regulator)
    R -- Vreg (Current Pulse) --> S2(FeFET 2nd Switch Input)
    R -- Vreg (Gate Drive) --> VAPT(Voltage Applying Transistor Gate)
    VAPD(MRAM Write Driver) --> VAPT
    VAPT --> S3(FeFET 3rd Switch)
    S3 --> MCD(MRAM Cell Drain/Bitline)
    S2 --> MCG(MRAM Cell Gate/Wordline)
    MCG --> MCD

Derivative 2.3: Operational Parameter Expansion - High-Temperature Radiation-Hardened Memory

Enabling Description: This derivative envisions the memory device operating in extreme high-temperature (e.g., 200° C.+) and high-radiation environments, such as those found in deep-well drilling, nuclear reactors, or space probes. The memory cell is a Silicon Carbide (SiC) or Silicon-on-Insulator (SOI) non-volatile memory designed for radiation hardness and high-temperature stability. The single regulator is a high-voltage, radiation-hardened (Rad-Hard) design, utilizing wide bandgap semiconductors (e.g., SiC, GaN) for its power stages and control logic, ensuring stable Vreg output under thermal and radiation stress. The second and third switches are also Rad-Hard SiC or SOI-based power switches, maintaining functionality and low leakage in hostile environments. The regulator output controls the second switch input and the gate of the Rad-Hard voltage applying transistor. The Rad-Hard third switch controls voltage delivery to the memory cell drain, and the Rad-Hard second switch applies voltage to the memory cell gate.

graph TD
    A[Rad-Hard Power] --> R(High-Temp Rad-Hard Regulator)
    R -- Vreg --> S2(Rad-Hard SiC 2nd Switch Input)
    R -- Vreg --> VAPT(Rad-Hard V-Apply Transistor Gate)
    B[Rad-Hard Booster] --> VAPD(Rad-Hard V-Apply Transistor Drain)
    VAPD --> S3(Rad-Hard SiC 3rd Switch)
    S3 --> MCD(Rad-Hard SiC Memory Cell Drain)
    S2 --> MCG(Rad-Hard SiC Memory Cell Gate)
    MCG --> MCD

Derivative 2.4: Operational Parameter Expansion - Terabit-Scale 3D NAND with Asynchronous Voltage Control

Enabling Description: This derivative scales the concept to Terabit-scale 3D NAND flash memory arrays, emphasizing highly optimized and localized voltage control for individual blocks or planes. The single regulator is a distributed, multi-phase linear regulator (LDO) operating with asynchronous control signals. Instead of global synchronous switching, the second and third switches (which are high-voltage, stackable NAND-optimized CMOS switches) receive localized control signals based on the specific 3D NAND block being accessed, enabling fine-grained voltage application. The regulator output is coupled to the input of the second switch and the gate of the voltage applying transistor, but the actual voltage application to individual memory cell drains (via the third switch) and gates (via the second switch) is managed by dedicated block-level asynchronous state machines to reduce peak power and improve overall array throughput. This allows for complex voltage profiling across different layers of the 3D stack.

graph TD
    A[Global Controller] --> R(Distributed Multi-Phase LDO)
    R -- Vreg --> S2(NAND HV CMOS 2nd Switch Input)
    R -- Vreg --> VAPT(NAND V-Apply Transistor Gate)
    VAPD(High-Voltage Source) --> VAPT
    VAPT --> S3(NAND HV CMOS 3rd Switch)
    S3 --> MCD(3D NAND Block Drain)
    S2 --> MCG(3D NAND Block Gate)
    MCG --> MCD
    A --> ASM1(Asynchronous State Machine 1)
    ASM1 --> S2
    ASM1 --> S3

Derivative 2.5: Cross-Domain Application - Smart Grid Edge Computing Memory

Enabling Description: This derivative applies the memory architecture to edge computing devices within a smart grid infrastructure, where robust and secure data logging is critical for energy management, fault detection, and predictive maintenance. The memory cell is an industrial-grade non-volatile memory (e.g., MRAM, FRAM) capable of operating reliably in harsh outdoor environments (temperature, EMI). The single regulator is designed for high efficiency and reliability, potentially drawing power from local energy harvesting or a redundant power supply. The second and third switches are robust, fail-safe components (e.g., industrial-grade power MOSFETs) that guarantee proper voltage application even during power fluctuations or cyber-physical attacks. The regulator's output is coupled to the second switch input and the gate of the voltage applying transistor. The third switch controls the application of the main voltage from the voltage applying transistor to the memory cell drain, used for logging grid events, while the second switch applies gate voltage for readback and verification.

graph TD
    A[Smart Grid Sensor] --> R(Industrial-Grade Regulator)
    R -- Vreg --> S2(Robust Power MOSFET 2nd Switch Input)
    R -- Vreg --> VAPT(Industrial V-Apply Transistor Gate)
    B[Local Power Supply] --> VAPD(Industrial V-Apply Transistor Drain)
    VAPD --> S3(Robust Power MOSFET 3rd Switch)
    S3 --> MCD(Industrial NVM Cell Drain)
    S2 --> MCG(Industrial NVM Cell Gate)
    MCG --> MCD

Derivative 2.6: Cross-Domain Application - Satellite On-Board Memory with Self-Healing

Enabling Description: This derivative leverages the single-regulator architecture for on-board memory in satellites or deep-space probes, where radiation tolerance and autonomous fault recovery are paramount. The memory cell is a radiation-hardened (Rad-Hard) non-volatile memory (e.g., Rad-Hard EEPROM or MRAM). The single regulator is a Rad-Hard, latch-up immune design with redundant power paths. The second and third switches are also Rad-Hard, featuring built-in current limiting and over-voltage protection to prevent single-event upsets (SEUs) or catastrophic failures. A local autonomous fault detection and recovery (ADFR) module monitors the memory array and voltage lines. If a fault is detected (e.g., a shorted switch or a stuck bit), the ADFR reconfigures the regulator's output (Vreg) and the switching logic (via the second and third switches) to bypass the faulty path or memory block. For instance, Vreg could be momentarily altered to re-initialize a stuck cell, or the third switch could be bypassed in favor of a redundant voltage path to the memory cell drain.

graph TD
    A[Satellite Power System] --> R(Rad-Hard Redundant Regulator)
    R -- Vreg --> S2(Rad-Hard Latch-up Immune 2nd Switch Input)
    R -- Vreg --> VAPT(Rad-Hard V-Apply Transistor Gate)
    B[Redundant HV Source] --> VAPD(Rad-Hard V-Apply Transistor Drain)
    VAPD --> S3(Rad-Hard Latch-up Immune 3rd Switch)
    S3 --> MCD(Rad-Hard Memory Cell Drain)
    S2 --> MCG(Rad-Hard Memory Cell Gate)
    MCG --> MCD
    ADFR[Autonomous Fault Detection & Recovery] --> R_CTRL(Regulator Control)
    ADFR --> S2_CTRL(Switch 2 Control)
    ADFR --> S3_CTRL(Switch 3 Control)
    MCD --> ADFR

Derivative 2.7: Integration with Emerging Tech - Dynamic Power Management via RISC-V Custom Instructions

Enabling Description: The single regulator and its associated switches (second and third) are controlled by a RISC-V processor core via custom extensions to the Instruction Set Architecture (ISA). Specific RISC-V custom instructions allow the processor to directly control the output voltage (Vreg) of the regulator, as well as the states of the second and third switches. This enables highly granular and dynamic power management of the memory subsystem at the software level. For instance, a program could issue an MV_SET_VREG <voltage_value> instruction to precisely set the regulator output for a specific memory operation, or MV_SWITCH_STATE <switch_id> <state> to activate/deactivate the switches. This allows for fine-tuning of memory performance (write/read speed) and power consumption based on application requirements, memory wear, or even real-time security demands, directly from the CPU.

graph TD
    A[RISC-V Core] --> Custom_ISA(RISC-V Custom Instructions)
    Custom_ISA --> R_CTRL(Regulator Control Unit)
    Custom_ISA --> S2_CTRL(Switch 2 Control Unit)
    Custom_ISA --> S3_CTRL(Switch 3 Control Unit)
    R_CTRL --> R(Custom-Controlled Regulator)
    R -- Vreg --> S2_IN(2nd Switch Input)
    R -- Vreg --> VAPT(Voltage Applying Transistor Gate)
    VAPD(Booster VPP2) --> VAPT
    VAPT --> S3(3rd Switch)
    S3 --> MC(Memory Cell Drain)
    S2_IN --> S2(2nd Switch Output)
    S2 --> MCG(Memory Cell Gate)
    MCG --> MC

Derivative 2.8: Integration with Emerging Tech - IoT Sensor Network with Secure Over-the-Air (OTA) Updates

Enabling Description: This derivative integrates the memory device into an IoT sensor node responsible for secure over-the-air (OTA) firmware updates. The single regulator's controlled voltage output and the third switch (controlling voltage application to the memory cell drain) are crucial for ensuring the integrity of the updated firmware during the write process to a non-volatile memory (e.g., embedded Flash). The second switch controls the gate voltage of the memory cell for both reliable write verification and secure boot processes after an update. The entire memory operation, including voltage application via the regulator and switches, is monitored by an on-chip security enclave. If an unauthorized voltage profile or write attempt is detected (e.g., indicating a tampering attempt during OTA update), the security enclave can trigger a system reset or activate a secure erase function by controlling the regulator and switches to apply specific, controlled voltages that securely wipe the memory, preventing malicious code injection.

graph TD
    A[IoT Gateway/Server] -- OTA Update --> SN(IoT Sensor Node)
    SN --> Security_Enclave(On-Chip Security Enclave)
    Security_Enclave --> R_CTRL(Regulator Control)
    Security_Enclave --> S2_CTRL(Switch 2 Control)
    Security_Enclave --> S3_CTRL(Switch 3 Control)
    R_CTRL --> R(Secure Regulator)
    R -- Vreg --> S2_IN(2nd Switch Input)
    R -- Vreg --> VAPT(Voltage Applying Transistor Gate)
    VAPD(Booster VPP2) --> VAPT
    VAPT --> S3(3rd Switch)
    S3 --> MC(Embedded Flash Cell Drain)
    S2_IN --> S2(2nd Switch Output)
    S2 --> MCG(Embedded Flash Cell Gate)
    MCG --> MC
    MC --> Security_Enclave

Derivative 2.9: The "Inverse" or Failure Mode - Power-Fail Safe Data Retention

Enabling Description: This derivative focuses on designing the memory device for power-fail safe data retention, particularly for applications requiring robust non-volatile storage during unexpected power loss. Upon detection of an imminent power failure, a dedicated power-fail interrupt (PFI) signal triggers a rapid sequence of operations. The single regulator, acting as a "backup mode regulator," quickly generates a precisely characterized, minimal-energy Vreg required to perform a final, highly reliable write of critical metadata or commit buffer contents to the memory cell. The second and third switches are designed with minimal latency and are controlled to execute this final write operation using the residual energy in on-chip capacitors. Subsequently, these switches enter a high-impedance, ultra-low leakage state, effectively isolating the memory cell and its gate/drain lines to maximize data retention time without any external power source. This ensures that the last valid state of critical data is saved before complete power down.

graph TD
    A[System Power] --> PMU(Power Management Unit)
    PMU --> PFI(Power-Fail Interrupt)
    PFI --> R_CTRL(Regulator Control)
    PFI --> S2_CTRL(Switch 2 Control)
    PFI --> S3_CTRL(Switch 3 Control)
    R_CTRL --> R(Backup Mode Regulator)
    R -- Vreg (Last Write) --> S2_IN(2nd Switch Input)
    R -- Vreg (Last Write) --> VAPT(Voltage Applying Transistor Gate)
    VAPD(Capacitor Bank) --> VAPT
    VAPT --> S3(3rd Switch)
    S3 --> MC(Critical Data Memory Cell Drain)
    S2_IN --> S2(2nd Switch Output)
    S2 --> MCG(Critical Data Memory Cell Gate)
    MCG --> MC

Derivative 2.10: The "Inverse" or Failure Mode - Data Scrubbing/Secure Erase Mode

Enabling Description: This derivative implements a "Data Scrubbing" or "Secure Erase Mode" for the memory device, designed to prevent data remanence for sensitive information. Upon command, the single regulator is commanded to generate specific voltage sequences (Vreg) that deliberately over-write or "scramble" the data in the memory cells multiple times, far beyond typical erase/write operations. The second and third switches are dynamically controlled to apply these scrubbing voltages to the memory cell gate and drain terminals in a complex pattern (e.g., alternating polarities, varying pulse widths) to ensure thorough and irreversible data destruction. The voltage applying transistor facilitates high-power erase cycles. This mode is distinct from a standard erase and is designed to meet stringent data sanitization standards, ensuring that even with advanced forensic techniques, previous data cannot be recovered.

graph TD
    A[Security Processor] --> SEC_ERASE(Secure Erase Command)
    SEC_ERASE --> R_CTRL(Regulator Control)
    SEC_ERASE --> S2_CTRL(Switch 2 Control)
    SEC_ERASE --> S3_CTRL(Switch 3 Control)
    R_CTRL --> R(Data Scrubber Regulator)
    R -- Vreg (Scrubbing Pulse) --> S2_IN(2nd Switch Input)
    R -- Vreg (Scrubbing Pulse) --> VAPT(Voltage Applying Transistor Gate)
    VAPD(High-Voltage Erase Source) --> VAPT
    VAPT --> S3(3rd Switch)
    S3 --> MC(Sensitive Data Memory Cell Drain)
    S2_IN --> S2(2nd Switch Output)
    S2 --> MCG(Sensitive Data Memory Cell Gate)
    MCG --> MC

Combination Prior Art Scenarios

Here are at least three "Combination Prior Art" scenarios where the core invention of US Patent 8,593,888 is combined with existing open-source standards, thereby expanding the defensive publishing landscape.

US 8,593,888 with JEDEC JESD209-5 (LPDDR5 Standard) for Dynamic Voltage Scaling (DVS) for NVM:
- Description: The memory device described in US 8,593,888, featuring a single shared regulator for memory cell gate and drain control, is implemented within an embedded non-volatile memory (eNVM) block alongside a LPDDR5-compliant DRAM subsystem. The JEDEC JESD209-5 standard provides specifications for power management and dynamic voltage and frequency scaling (DVFS) for LPDDR5. A memory controller, adhering to JEDEC LPDDR5 power management protocols, sends commands to the US 8,593,888's single regulator to dynamically adjust Vreg based on the system's current power state (e.g., active, idle, deep sleep) and required eNVM access performance. This enables adaptive power savings for the eNVM, where the shared regulator is either boosting for fast write operations (First Mode) or providing a precise gate voltage for low-power read operations (Second Mode), aligning with the overall LPDDR5 power states. The mode transitions and voltage level adjustments are fully compliant with the JEDEC standard for interface and operational timing.
```
graph TD
    A[LPDDR5 Memory Controller] -- Power Management Commands --> R_CTRL(Regulator Control Unit)
    R_CTRL --> R(Single Regulator)
    R -- Vreg --> S1(1st Switch)
    R -- Vreg --> S2(2nd Switch)
    S1 --> VAPT(Voltage Applying Transistor Gate)
    S2 --> MCG(Memory Cell Gate)
    VAPT --> MC_Drain(Memory Cell Drain Path)
    MC_Drain --> MC(eNVM Memory Cell)
    MCG --> MC
    A -- Data/Address --> MC
    JEDEC[JEDEC JESD209-5 Compliance] -- Governs --> R_CTRL
```
US 8,593,888 with RISC-V ISA (Privileged Architecture) for Secure Boot & Firmware Update Memory:
- Description: The semiconductor memory device of US 8,593,888 is integrated into a system-on-chip (SoC) featuring a RISC-V processor core. The RISC-V privileged architecture specification defines different privilege levels (M-mode, S-mode, U-mode) and mechanisms for secure boot and firmware updates. The single regulator and its associated switches are managed by a dedicated hardware block, accessible only via custom RISC-V instructions or specific memory-mapped registers within the Machine-mode (M-mode) privilege level. During a secure boot sequence or an authenticated firmware update, the RISC-V processor in M-mode issues these specialized instructions to precisely control the regulator's output (Vreg) and the switching sequence, ensuring that memory cells storing critical boot code or new firmware images are written/erased only with verified voltage profiles. This prevents unauthorized modification or corruption of the memory contents, leveraging the fine-grained voltage control of US 8,593,888 for enhanced system security as part of a RISC-V secure boot chain.
```
graph TD
    A[RISC-V Processor (M-mode)] -- Custom Instructions/MMIO --> R_CTRL(Secure Regulator Control)
    R_CTRL --> R(Single Regulator)
    R -- Vreg --> S1(1st Switch)
    R -- Vreg --> S2(2nd Switch)
    S1 --> VAPT(Voltage Applying Transistor Gate)
    S2 --> MCG(Memory Cell Gate)
    VAPT --> MC_Drain(Memory Cell Drain Path)
    MC_Drain --> MC(Secure Boot NVM)
    MCG --> MC
    RISCV_ISA[RISC-V Privileged ISA] -- Governs --> A
```
US 8,593,888 with Common Public Radio Interface (CPRI) for Remote Radio Head (RRH) Configuration Memory:
- Description: A semiconductor memory device based on US 8,593,888 is deployed in a Remote Radio Head (RRH) within a cellular base station, where CPRI defines the interface between the RRH and the Baseband Unit (BBU). The memory stores critical configuration parameters, calibration data, and operational firmware for the RRH. The CPRI standard includes provisions for control and management plane signaling. A BBU, communicating over CPRI, can send specific commands that are interpreted by the RRH's local controller to manage the US 8,593,888's single regulator and switches. This allows for dynamic adjustment of memory voltage profiles (Vreg) for optimal performance or specific operational modes (e.g., low-power standby, full-power transmission, diagnostic mode) in the RRH, where precise memory operations are crucial for RF performance. For instance, during a CPRI-initiated calibration sequence, the regulator may be adjusted to ensure highly accurate writes to memory cells storing calibration coefficients.
```
graph TD
    A[Baseband Unit (BBU)] -- CPRI Control Plane --> RHC(RRH Local Controller)
    RHC --> R_CTRL(Regulator Control Unit)
    R_CTRL --> R(Single Regulator)
    R -- Vreg --> S1(1st Switch)
    R -- Vreg --> S2(2nd Switch)
    S1 --> VAPT(Voltage Applying Transistor Gate)
    S2 --> MCG(Memory Cell Gate)
    VAPT --> MC_Drain(Memory Cell Drain Path)
    MC_Drain --> MC(RRH Configuration NVM)
    MCG --> MC
    CPRI[CPRI Standard] -- Governs --> RHC
```