A DTMOS-Based Memristor Emulator Circuit for Low-Power Biomedical Signal Conditioning.

Area of Science:

• Electronics Engineering
• Biomedical Engineering
• Materials Science

Background:

• Memristor emulators are crucial for analog front-end circuits in biomedical devices.
• Existing emulators often face challenges with power consumption, size, and operating frequency.
• There is a need for compact, low-power, and high-speed memristor emulators for biomedical signal processing.

Purpose of the Study:

• To present a novel, minimalist floating memristor emulator circuit.
• To design a circuit with minimal components for low-power biomedical analog front ends.
• To achieve high-speed operation and robustness for adaptive signal conditioning.

Main Methods:

• Developed a circuit topology using two dynamic threshold MOS (DTMOS) transistors and one capacitor.
• Utilized body-effect coupling in DTMOS devices for state-dependent resistance.
• Performed comprehensive simulations in a 0.18 μm CMOS process.
• Conducted experimental validation using a discrete CD4007-based prototype.

Main Results:

• The emulator exhibits core memristive characteristics, including a tunable, frequency-dependent pinched hysteresis loop.
• Demonstrated non-volatile memory capabilities and robustness across temperature and process variations.
• Experimental results confirmed the pinched hysteresis loop from 100 Hz to 800 kHz, with simulated operation up to 500 MHz.
• Achieved minimal transistor count and low power consumption with floating operation.

Conclusions:

• The proposed minimalist memristor emulator offers a compelling solution for low-power, high-speed biomedical analog front ends.
• Its compact design and efficient operation make it suitable for area and power-constrained adaptive signal conditioning systems.
• This emulator advances the development of next-generation biomedical devices requiring efficient analog signal processing.