A Reconfigurable Differential-to-Single-Ended Autonomous Current Adaptation Buffer Amplifier Suitable for Biomedical...

Area of Science:

• • Electrical Engineering
• • Analog Integrated Circuit Design
• • Biomedical Engineering

Background:

• • Existing buffer amplifiers often lack adaptability and power efficiency for sensitive physiological signal acquisition.
• • Need for circuits that can dynamically adjust performance based on signal characteristics without complex control systems.

Purpose of the Study:

• • To propose and demonstrate a novel reconfigurable differential-to-single-ended autonomous current adaptation buffer amplifier (ACABA).
• • To achieve power efficiency and high performance suitable for processing dynamic physiological signals.
• • To enable adjustable gain, output DC level, and bandwidth using floating-gate technology.

Main Methods:

• • Design and fabrication of an ACABA prototype using floating-gate technologies in a 0.18 μm CMOS process.
• • Utilization of capacitive circuit design for reconfigurability of output DC level and bandwidth by programming floating nodes.
• • Implementation of autonomous current adaptation for dynamic slew rate enhancement without external control circuits.

Main Results:

• • Fabricated prototype occupies an area of 0.01 mm².
• • Achieved a unity-gain bandwidth of 10.5 MHz with a 1 pF load, consuming 70 μW.
• • Demonstrated a high slew rate of 20 V/μs and an IIP2 value of 65 dBV.

Conclusions:

• • The proposed ACABA offers a power-efficient and reconfigurable solution for physiological signal processing.
• • Autonomous current adaptation enables high slew rates when needed while maintaining low quiescent power.
• • The circuit's adjustability and performance metrics make it suitable for various bio-sensing applications.