A 10-bit 25-MS/s 1.25-mW Pipelined ADC With a Semidigital Gm-Based Amplifier

Author

Yunjae Suh ; Jongmi Lee ; Byungsub Kim ; Hong-June Park ; Jae-Yoon Sim

Author_Institution

Dept. of Electron. & Electr. Eng., Pohang Univ. of Sci. & Technol., Pohang, South Korea

Volume

60

Issue

3

fYear

2013

fDate

Mar-13

Firstpage

142

Lastpage

146

Abstract

A semidigital Gm-based amplifier is proposed for a low-power pipelined analog-to-digital converter (ADC). The amplifier performs a class-AB operation by smoothly changing between a comparator-like semidigital driver and a continuous-time high-gain amplifier according to the input voltage difference. A 10-bit pipelined ADC with 2.5-bit/stage architecture is implemented in a 0.13- CMOS. The ADC consumes 1.25 mW at a sampling rate of 25 MS/s and achieves a Nyquist-rate figure-of-merit of 139 and 232 fJ/c-s without and with power consumption from a resistor ladder, respectively.

Keywords

CMOS analogue integrated circuits; analogue-digital conversion; comparators (circuits); continuous time systems; driver circuits; low-power electronics; operational amplifiers; power consumption; CMOS; Nyquist-rate figure-of-merit; class-AB operation; comparator-like semidigital driver; continuous-time high-gain amplifier; input voltage difference; low-power pipelined analog-to-digital converter; pipelined ADC; power 1.25 mW; power consumption; resistor ladder; sampling rate; semidigital Gm-based amplifier; size 0.13 mum; word length 10 bit; CMOS integrated circuits; Digital control; Power demand; Resistance; Resistors; Transistors; Analog-to-digital converter (ADC); Gm-based amplifier; operational transconductance amplifier (OTA); pipelined ADC; semidigital amplifier;

fLanguage

English

Journal_Title

Circuits and Systems II: Express Briefs, IEEE Transactions on

Publisher

ieee

ISSN

1549-7747

Type

jour

DOI

10.1109/TCSII.2013.2240832

Filename

6475169