Analysis and Design of Fully Differential Gain-Boosted Op-amp for 14bit 100MS/s Pipelined Analog-to-Digital Converter

Author

Wenxiao, Feng ; Tiejun, Lu ; Zongmin, Wang

Author_Institution

Beijing Microelectron. Technol. Inst., Beijing, China

fYear

2009

fDate

25-27 Aug. 2009

Firstpage

66

Lastpage

69

Abstract

This paper presents the analysis and design of high speed, high gain fully differential operational amplifier(op-amp). The op-amp is designed for sample and hold circuit of 14 bit 100 MS/s pipelined analog-to-digital converter (ADC). Both the main op-amp and the boosting op-amp are fully differential folded-cascode. The main op-amp has a switched capacitance common mode feedback circuit. The boosting op-amp is connected as a follower. The op-amp is designed in 0.18 mum CMOS process with 3.0 V power supply. Spectre simulation shows that the op-amp has the DC gain of 112 dB and the unity gain bandwidth of 1.15 GHz.

Keywords

CMOS integrated circuits; analogue-digital conversion; feedback amplifiers; operational amplifiers; pipeline processing; CMOS process; Spectre simulation; bandwidth 1.15 GHz; fully-differential folded-cascode; fully-differential gain-boosted op-amp; gain 112 dB; operational amplifier; pipelined analog-to-digital converter; size 0.18 mum; storage capacity 14 bit; switched capacitance common mode feedback circuit; voltage 3.0 V; Analog-digital conversion; Boosting; CMOS process; Capacitance; Circuit simulation; Differential amplifiers; Feedback circuits; Operational amplifiers; Power supplies; Switching circuits; boosting amplifier; folded cascode; fully differential op-amp; pipelined ADC;

fLanguage

English

Publisher

ieee

Conference_Titel

INC, IMS and IDC, 2009. NCM '09. Fifth International Joint Conference on

Conference_Location

Seoul

Print_ISBN

978-1-4244-5209-5

Electronic_ISBN

978-0-7695-3769-6

Type

conf

DOI

10.1109/NCM.2009.133

Filename

5331752