This work proposes a novel switching algorithm for capacitive digital-to-analog converters (CDAC) in successive approximation register (SAR) analog-to-digital converters (ADC). The proposed CDAC requires the same number of capacitors and switches as the monotonic switching CDAC while achieving a much smaller output common mode swing. This is obtained by properly alternating upwards and downwards transitions in the CDAC and by temporarily shifting the output common mode voltage. In addition, the common mode voltage to which the CDAC outputs converge can be decoupled from the input common mode of the ADC. As a result, the performance of the converter improves significantly because the behavior of the CDAC can be tailored according to the optimum input common mode of the comparator. The only cost is a slight increase of the average power consumption. The proposed technique has been validated by applying it to a 10 bit, 150 MS/s SAR ADC implemented in a 55 nm technology by STMicroelectronics. Despite the absence of calibration and redundant encoding, the ADC exhibits a signal-to-noise-and-distortion ratio (SNDR) of 56.3 dB while consuming 5.7 mW from a 1 V supply.

A 150 MS/s, 10 bit SAR ADC Featuring a Modified Quasi-Monotonic Switching Scheme / Spinogatti, Valerio; Bocciarelli, Cristian; Eusebio, Lorenzo; Centurelli, Francesco; Scotti, Giuseppe; Trifiletti, Alessandro. - (2024). (Intervento presentato al convegno 19th Conference on Ph.D Research in Microelectronics and Electronics, PRIME 2024 tenutosi a Larnaca; Cyprus) [10.1109/prime61930.2024.10559683].

A 150 MS/s, 10 bit SAR ADC Featuring a Modified Quasi-Monotonic Switching Scheme

Spinogatti, Valerio;Bocciarelli, Cristian;Eusebio, Lorenzo;Centurelli, Francesco;Scotti, Giuseppe;Trifiletti, Alessandro
2024

Abstract

This work proposes a novel switching algorithm for capacitive digital-to-analog converters (CDAC) in successive approximation register (SAR) analog-to-digital converters (ADC). The proposed CDAC requires the same number of capacitors and switches as the monotonic switching CDAC while achieving a much smaller output common mode swing. This is obtained by properly alternating upwards and downwards transitions in the CDAC and by temporarily shifting the output common mode voltage. In addition, the common mode voltage to which the CDAC outputs converge can be decoupled from the input common mode of the ADC. As a result, the performance of the converter improves significantly because the behavior of the CDAC can be tailored according to the optimum input common mode of the comparator. The only cost is a slight increase of the average power consumption. The proposed technique has been validated by applying it to a 10 bit, 150 MS/s SAR ADC implemented in a 55 nm technology by STMicroelectronics. Despite the absence of calibration and redundant encoding, the ADC exhibits a signal-to-noise-and-distortion ratio (SNDR) of 56.3 dB while consuming 5.7 mW from a 1 V supply.
2024
19th Conference on Ph.D Research in Microelectronics and Electronics, PRIME 2024
High-speed ADC; SAR ADC; capacitive DAC; comparators
04 Pubblicazione in atti di convegno::04b Atto di convegno in volume
A 150 MS/s, 10 bit SAR ADC Featuring a Modified Quasi-Monotonic Switching Scheme / Spinogatti, Valerio; Bocciarelli, Cristian; Eusebio, Lorenzo; Centurelli, Francesco; Scotti, Giuseppe; Trifiletti, Alessandro. - (2024). (Intervento presentato al convegno 19th Conference on Ph.D Research in Microelectronics and Electronics, PRIME 2024 tenutosi a Larnaca; Cyprus) [10.1109/prime61930.2024.10559683].
File allegati a questo prodotto
File Dimensione Formato  
Spinogatti_A 150 MS/s_2024.pdf

solo gestori archivio

Tipologia: Versione editoriale (versione pubblicata con il layout dell'editore)
Licenza: Tutti i diritti riservati (All rights reserved)
Dimensione 483.66 kB
Formato Adobe PDF
483.66 kB Adobe PDF   Contatta l'autore

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1717598
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 0
  • ???jsp.display-item.citation.isi??? 0
social impact