A Low-Power, Low-Noise, Resistive-Bridge Microsensor Readout Circuit with Chopper-Stabilized Recycling Folded Cascode Instrumentation Amplifier

In this paper, a low-power and low-noise readout circuit for resistive-bridge microsensors is presented. The chopper-stabilized, recycling folded cascode current-feedback instrumentation amplifier (IA) proposed to achieve the low-power, low-noise, high-input impedance. topology (with Monticelli-style, class-AB output stage) can enhance overall noise characteristic, gain, slew rate. consists of IA, low-pass filter (LPF), ADC driving buffer, 12-bit successive-approximation-register (SAR) analog-to-digital converter (ADC). prototype implemented in standard 0.18 µm CMOS process, with an active area 12.5 mm2. measured input-referred at 1 Hz 86.6 nV/√Hz efficiency factor (NEF) 4.94, respectively. total current consumption 2.23 μA, 1.8 V power supply.