A 10-bit, 771 nW Time-Mode ADC with a 2-Step TDC for Bio-Signal Acquisition

Conference Paper (2021)
Author(s)

E. Kandilakis (TU Delft - Bio-Electronics)

WA Serdijn (TU Delft - Bio-Electronics)

Can Akgün (TU Delft - Bio-Electronics)

Research Group
Bio-Electronics
Copyright
© 2021 E. Kandilakis, W.A. Serdijn, O.C. Akgün
DOI related publication
https://doi.org/10.1109/BioCAS49922.2021.9644997
More Info
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Publication Year
2021
Language
English
Copyright
© 2021 E. Kandilakis, W.A. Serdijn, O.C. Akgün
Research Group
Bio-Electronics
Pages (from-to)
1-6
ISBN (print)
978-1-7281-7205-7
ISBN (electronic)
978-1-7281-7204-0
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Abstract

In this paper, we present the design of a low-voltage, low-power, and small-area time-mode ADC (TM-ADC) for bio-signal sensing applications. The proposed time-mode ADC (TM-ADC) consists of a programmable oversampling ratio (OSR), voltage-controlled ring oscillator (VCRO) based analog-to-time converter (ATC), followed by an asynchronous unfolded SAR coarse TDC and an asynchronous, enhanced-range fine flash TDC. The integrated circuit has been implemented in a standard CMOS 65 nm process and its performance has been evaluated through extracted transient noise simulations. The ADC consumes 771 nW at a sampling rate of 2.2 kHz from a 0.5V supply voltage and achieves 10-bit resolution in a total area of 0.014 mm2. The simulation results indicate DNL and INL values of +0.86/-0.83 and +0.88/-1.79, respectively, an SNDR of 60.7 dB and an ENOB of 9.8 bits for a 10mV peak-to-peak signal 1kHz input signal.

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