A novel common-mode sensing circuit with large input swing for Op-AMP with common-mode feedback

Author

Ma, Hua ; Ye, Yizheng ; Yu, Minyan ; Lai, Jinbao

Author_Institution

Harbin Inst. of Technol., Harbin

fYear

2007

fDate

22-25 Oct. 2007

Firstpage

465

Lastpage

468

Abstract

A novel continuous common-mode (CM) voltage sensing circuit is presented for Op-amp with large input swing. It has two stages: the first stage reduces the input swing, and the second detects the CM voltage. The proposed circuit is analyzed in detail. Finally, the circuit is designed with mixed-signal 0.18 um CMOS process, and the simulation results show that: the fluctuation of the sensing CM voltage is less than 1.5 mv when the input swing is up to plusmn0.8 V, which guarantees the minimization of the offset of the common-mode voltage and improves the linearity of the Op-amp.

Keywords

CMOS analogue integrated circuits; electric sensing devices; mixed analogue-digital integrated circuits; operational amplifiers; common-mode feedback; continuous common-mode voltage sensing circuit; mixed-signal CMOS process; operational amplifiers; size 0.18 mum; Current measurement; Feedback circuits; Fluctuations; Linearity; Microelectronics; Operational amplifiers; Resistors; Silicon; Switching circuits; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

ASIC, 2007. ASICON '07. 7th International Conference on

Conference_Location

Guilin

Print_ISBN

978-1-4244-1132-0

Electronic_ISBN

978-1-4244-1132-0

Type

conf

DOI

10.1109/ICASIC.2007.4415668

Filename

4415668