A low-voltage low-power fully differential rail-to-rail input/output opamp in 65-nm CMOS

Author

Yan, Weixun ; Kolm, Robert ; Zimmermann, Horst

Author_Institution

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

fYear

2008

fDate

18-21 May 2008

Firstpage

2274

Lastpage

2277

Abstract

A new fully differential rail-to-rail input/output opamp with constant small- and large-signal behavior fabricated in 65-nm digital CMOS technology is proposed. A novel current- mode common-mode feedback circuit is introduced to regulate the signal behavior. Measurements are done when the supply voltage is plusmn0.5 V and the load is 15 pF. The opamp attains a DC gain of 100 dB, a unity-gain frequency of 40 MHz, a phase margin of 64deg and a low power consumption of 720 muW. The small-signal behavior variation is only plusmn2.2%. The large-signal behavior is also verified to be constant.

Keywords

CMOS analogue integrated circuits; differential amplifiers; feedback amplifiers; low-power electronics; operational amplifiers; DC gain; current-mode common-mode feedback circuit; digital CMOS technology; frequency 40 MHz; fully differential rail-to-rail input-output opamp; gain 100 dB; low-power opamp; low-voltage opamp; phase margin; power 720 muW; size 65 nm; small-signal behavior variation; unity-gain frequency; CMOS digital integrated circuits; CMOS technology; Capacitance; Capacitors; Design optimization; Feedback circuits; Frequency; Leakage current; Rail to rail inputs; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2008. ISCAS 2008. IEEE International Symposium on

Conference_Location

Seattle, WA

Print_ISBN

978-1-4244-1683-7

Electronic_ISBN

978-1-4244-1684-4

Type

conf

DOI

10.1109/ISCAS.2008.4541907

Filename

4541907