Differential OPAMP with Inherent Common-Mode Control and Self-Biased Cascodes in 120nm CMOS

Author

Schlogl, F. ; Dietrich, Horst ; Zimmermann, Horst

Author_Institution

Inst. of Electr. Measurements & Circuit Design, Vienna Univ. of Technol.

fYear

2006

fDate

4-7 Dec. 2006

Firstpage

17

Lastpage

20

Abstract

A fully differential operational amplifier with high gain and high bandwidth in deep-sub-mum CMOS is presented. The operational amplifier has up to five serial connected stages. The shown signal-path concept is suitable to reach high gain and bandwidth. The used compensation avoids pole-zero doublet problems. Positive-feedback circuits are used to set the operating point of cascodes and load elements. Production costs are kept low by using only regular-threshold transistors in the design. A DC gain of 99dB and a transit frequency of 330MHz were measured

Keywords

CMOS analogue integrated circuits; circuit feedback; operational amplifiers; 120 nm; 330 MHz; 99 dB; common-mode control; deep-sub-micron CMOS; differential op amp; operational amplifier; pole-zero doublet problem avoidance; positive-feedback circuits; self-biased cascodes; signal-path concept; Bandwidth; CMOS technology; Circuit synthesis; Costs; Differential amplifiers; Feedforward systems; Frequency; Gain measurement; Low voltage; Operational amplifiers; common mode control; operational amplifier; self-biased cascode;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2006. APCCAS 2006. IEEE Asia Pacific Conference on

Conference_Location

Singapore

Print_ISBN

1-4244-0387-1

Type

conf

DOI

10.1109/APCCAS.2006.342252

Filename

4145321