A 10-bit 50-MS/s SAR ADC for dual-voltage domain portable systems

Wei Hao Tsai, Che Hsun Kuo, Soon Jyh Chang, Li Tse Lo, Ying Cheng Wu, Chun Jen Chen

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Abstract

The analog-to-digital converter (ADC) is an essential component providing the interface between the sensed analog signal and the corresponding digital representation for a portable ultrasonic systems. In order to extend the battery life for the portable system, a low-voltage ADC is crucial for saving the power. However, the sensed analog signal is usually larger than the tolerable range of a low-voltage ADC. A level shifter, which possibly consumes more power than ADC, is therefore adopted to solve this problem. This paper presents a 10-bit 50-MS/s successive approximation register (SAR) ADC by manipulating simple but effective circuit design techniques to operate at dualvoltage domain without the need of an additional level shifter for shrinking the input signals. Particularly, we propose a technique to implement the ADC with 3.3-V I/O devices and 1.2V MOS transistors. The proof-of-concept design was fabricated in TSMC 130-nm 1P8M CMOS technology. It consumes 1.6 mW at a 50 MS/s sampling frequency and about 2 MHz sinusoidal input signal with 1.65V input common-mode voltage and 2Vp-p differential input amplitude. The measurement result shows an ENOB of 9.15 bits, and both the DNL and INL are within 1 LSB. The active area is 0.226 mm2.

Original languageEnglish
Title of host publication2015 IEEE International Symposium on Circuits and Systems, ISCAS 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages2425-2428
Number of pages4
ISBN (Electronic)9781479983919
DOIs
Publication statusPublished - 2015 Jul 27
EventIEEE International Symposium on Circuits and Systems, ISCAS 2015 - Lisbon, Portugal
Duration: 2015 May 242015 May 27

Publication series

NameProceedings - IEEE International Symposium on Circuits and Systems
Volume2015-July
ISSN (Print)0271-4310

Other

OtherIEEE International Symposium on Circuits and Systems, ISCAS 2015
CountryPortugal
CityLisbon
Period15-05-2415-05-27

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

Fingerprint Dive into the research topics of 'A 10-bit 50-MS/s SAR ADC for dual-voltage domain portable systems'. Together they form a unique fingerprint.

Cite this