120nm CMOS operational amplifier with pseudo-cascodes and positive feedback

Author

Schlögl, F. ; Zimmerman, H.

Author_Institution

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

fYear

2003

Firstpage

277

Lastpage

280

Abstract

A fully differential 3-stage operational amplifier in 0.12μm digital CMOS technology achieving a differential gain in excess of 86dB is presented. This operational amplifier contains only regular-VTh transistors. It uses a pseudo-cascode input differential stage and a pseudo-cascoded load for the high gain. Positive feedback is primarily implemented for a good common-mode rejection. A transit frequency of 46 MHz and a phase margin of 66° at a ±0.6V supply and with a load of 10pF have been measured. The current consumption is less than 1.7mA in the temperature range from -40 to +80°C.

Keywords

CMOS digital integrated circuits; integrated circuit design; operational amplifiers; -40 to 80 C; 1.7 mA; 10 pF; 120 nm; 46 MHz; 86 dB; CMOS operational amplifier; common-mode rejection; complementary metal oxide semiconductor; current consumption; differential gain; differential operational amplifier; phase margin; positive feedback; pseudocascoded load; transit frequency; Analog circuits; CMOS digital integrated circuits; CMOS technology; Differential amplifiers; Digital circuits; Feedback; Frequency; Operational amplifiers; Power supplies; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

System-on-Chip for Real-Time Applications, 2003. Proceedings. The 3rd IEEE International Workshop on

Print_ISBN

0-7695-1944-X

Type

conf

DOI

10.1109/IWSOC.2003.1213048

Filename

1213048