A VCO-Based ADC with Relaxation Oscillator for Biomedical Applications

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Abstract

This paper describes a voltage controlled oscillator(VCO) -based ADC for biomedical applications which employs a relaxation oscillator for voltage-to-frequency conversion. The proposed circuit uses a redundant pair of capacitors to mitigate the conversion error resulting from the time required for resetting the capacitor. A switch matrix with feedback helps sustain oscillations. Further, the VCO frequency approaches zero as the input voltage approaches zero unlike a converter with ring oscillator, thereby reducing power consumption. Post-layout simulation of the proposed ADC designed with a 28 nm FDSOI CMOS technology shows an ENOB of 8 and power consumption of 12 uW from a 0.7 V supply.

Details

Original languageEnglish
Title of host publication2018 IEEE International Conference on Electronics Circuits and Systems
Publication statusPublished - 2018
MoE publication typeA4 Article in a conference publication
EventIEEE International Conference on Electronics Circuits and Systems - Bordeaux, France
Duration: 9 Dec 201812 Dec 2018
https://www.ieee-icecs2018.org/

Conference

ConferenceIEEE International Conference on Electronics Circuits and Systems
Abbreviated titleICECS
CountryFrance
CityBordeaux
Period09/12/201812/12/2018
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    Research areas

  • VCO, ADC, relaxation oscillator, voltage-to-frequency, biomedical applications

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