A 16-W 10-kHz BW Incremental ADC with Automatic EDO Canceling for Implantable Neural Recording

This paper presents a DC-coupled, incremental AE analog-to-digital converter (ADC) based on two-step quantization for high-density implantable neural signal recording. To address the problem of electrode DC offset (EDO), a compensation circuit is proposed in this paper which can automatically cancel the EDO. Fabricated in a 180-nm CMOS process, the prototype ADC achieves a high input impedance, 20-mVpp linear input range, 60.3-dB signal-to-noise and distortion ratio (SNDR). Its core circuit has a power consumption of 16 iiW and an area of 0.0165mm(2).The referedto-input (RTI) noise is 6 iiVrms (1-10kHz) and it can cancel the EDO up to +/- 90mV.