Two SC-CMFB networks used in fully differential OTA: measurements and improvements

Author

Recoules, H. ; Bouchakour, R. ; Loumeau, P. ; Braz, F.T.

Author_Institution

Dept. Electron., Ecole Nat. Superieure des Telecommun., Paris, France

fYear

1998

fDate

9-12 Aug 1998

Firstpage

352

Lastpage

355

Abstract

Two SC common mode feedbacks are separately used to control the output dc level of a fully differential OTA. Both circuits are compared in order to put forward their drawbacks and advantages. Simulations and measurements are presented for both circuits. They show that the design of these SC networks has to be optimized in order to reduce their sensitivity to the layout. Finally the performance of the amplifier is presented, it achieves 70 dB of dc gain, 50 MHz of gain-bandwidth and a phase margin greater than 80 degrees

Keywords

circuit feedback; circuit simulation; differential amplifiers; feedback amplifiers; integrated circuit measurement; operational amplifiers; sensitivity analysis; switched capacitor networks; SC-CMFB networks; common mode feedbacks; fully differential OTA; gain-bandwidth; phase margin; sensitivity; Capacitors; Circuit simulation; Design optimization; Feedback loop; Frequency; Gain; Intelligent networks; Output feedback; Transconductance; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1998. Proceedings. 1998 Midwest Symposium on

Conference_Location

Notre Dame, IN

Print_ISBN

0-8186-8914-5

Type

conf

DOI

10.1109/MWSCAS.1998.759504

Filename

759504