Analysis and Design of Constant-Slope Voltage-to-Time Converters

Santeri Porrasmaa*, Okko Järvinen, Ilia Kempi, Kari Stadius, Marko Kosunen, Jussi Ryynänen

*Corresponding author for this work

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

Abstract

Time-based analog-to-digital converters (ADCs) have recently gained attention because of their ability to reach high sample rates with good energy efficiency. The performance of most implementations is limited by the Voltage-to-Time Converter (VTC), hence necessitating thorough analysis on its performance. This paper derives expressions for the noise and linearity of a constant-slope VTC. The derived expressions provide an explicit link between the circuit parameters and VTC performance as well as offer insight on the available trade-offs. Based on the expressions, a general design methodology for constant-slope VTCs is proposed. The simulated verification with 28-nm CMOS shows good agreement with the presented analysis and with previously measured results, thereby corroborating the proposed design methodology. The presented design methodology allows the developed understanding between the VTC circuit parameters and performance metrics to be utilized in e.g. design exploration and algorithmic circuit optimization to find an optimal set of parameters for a given target specification.

Original languageEnglish
Title of host publicationISCAS 2024 - IEEE International Symposium on Circuits and Systems
PublisherIEEE
Number of pages5
ISBN (Electronic)979-8-3503-3099-1
DOIs
Publication statusPublished - 2024
MoE publication typeA4 Conference publication
EventIEEE International Symposium on Circuits and Systems - Singapore, Singapore
Duration: 19 May 202422 May 2024

Publication series

NameIEEE International Symposium on Circuits and Systems proceedings
ISSN (Print)0271-4310
ISSN (Electronic)2158-1525

Conference

ConferenceIEEE International Symposium on Circuits and Systems
Abbreviated titleISCAS
Country/TerritorySingapore
CitySingapore
Period19/05/202422/05/2024

Keywords

  • ADC
  • analog-to-digital converter
  • linearity
  • noise
  • power-area-speed trade-off
  • time-based
  • voltage-to-time converter
  • VTC

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