A VCO-Based ADC with Relaxation Oscillator for Biomedical Applications

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review


Research units


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.


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


ConferenceIEEE International Conference on Electronics Circuits and Systems
Abbreviated titleICECS
Internet address

    Research areas

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

Download statistics

No data available

ID: 30453996