A 178.9-dB FoM 128-dB SFDR VCO-Based AFE for ExG Readouts With a Calibration-Free Differential Pulse Code Modulation Technique

Jiannan Huang; Patrick P. Mercier

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A 178.9-dB FoM 128-dB SFDR VCO-Based AFE for ExG Readouts With a Calibration-Free Differential Pulse Code Modulation Technique

机译：A 178.9-dB FoM 128-dB SFDR VCO-Based AFE for ExG Readouts With a Calibration-Free Differential Pulse Code Modulation Technique

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This article presents a voltage-controlled oscillator (VCO)-based analog front end (AFE) for ExG readout applications with both a wide dynamic range (DR) and high linearity. By using a differential pulse code modulation (DPCM) technique, VCO non-linearity is mitigated by operating the VCO in the small-signal linear regime. To minimize power consumption from the power-hungry gain error calibration, the effect of VCO gain variation within the DPCM loop is investigated, leading to a calibration-free DPCM via a inline-formula tex-math notation="LaTeX"$Delta Sigma $ /tex-math/inline-formula truncator. At the circuit level, a coarse–fine phase decoding scheme is proposed to increase signal-to-quantization-noise ratio (SQNR) while avoiding metastability issues. Fabricated in 65 nm, the AFE occupies an area of 0.056 mmsup2/sup. It achieves 94.2-dB SNDR and 95.1-dB DR in 500 Hz of bandwidth while dissipating 1.68-inline-formula tex-math notation="LaTeX"$mu text{W}$ /tex-math/inline-formula power from a single 0.8-V supply, yielding a Schreier FoM of 178.9 dB. Importantly, the techniques enable a virtually distortion-less spectrum with a noise-floor limited spurious-free dynamic range (SFDR) of 128 dB. In addition, the AFE is validated with ECG and EOG recording, demonstrating complete signal capturing in the presence of motion/stimulation artifacts.

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来源
《IEEE Journal of Solid-State Circuits》 |2021年第11期|3236-3246|共11页
作者
Jiannan Huang; Patrick P. Mercier;
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作者单位

Department of Electrical and Computer Engineering, University of California at San Diego, La Jolla, CA, USA;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
中图分类基本电子电路;
关键词
Pulse modulation; Voltage-controlled oscillators; Gain; Signal to noise ratio; Transfer functions; Noise shaping; Impedance; Analog front end (AFE); analog-to-digital converter (ADC); calibration-free; differential pulse code modulation (DPCM); ExG readout; noise shaping; voltage-controlled oscillator (VCO);

A 178.9-dB FoM 128-dB SFDR VCO-Based AFE for ExG Readouts With a Calibration-Free Differential Pulse Code Modulation Technique

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