An offset compensated and high-gain CMOS current-feedback op-amp

Author

Assi, Ali ; Sawan, Mohamad ; Zhu, Jieyan

Author_Institution

Dept. of Electr. & Comput. Eng., Ecole Polytech. de Montreal, Que., Canada

Volume

45

Issue

1

fYear

1998

fDate

1/1/1998 12:00:00 AM

Firstpage

85

Lastpage

90

Abstract

This work describes a new CMOS current-feedback operational amplifier (CFOA) with an on-chip continuous-time current-mode input offset voltage compensation circuit. The proposed compensation method is based on a combination of two techniques: the error integration and the current feedback. In addition, this method is irrespective of process and temperature parameters because of its fully symmetrical architecture. HSPICE simulations of the designed CMOS CFOA layout show that the input offset voltage could be reduced to lass than 1 mV, and a gain of around 112 dB and a power consumption of less than 3 mW are achievable

Keywords

CMOS analogue integrated circuits; differential amplifiers; error compensation; feedback amplifiers; integrated circuit layout; operational amplifiers; 1 mV; 112 dB; 3 mW; IC layout; current-feedback op-amp; current-mode compensation circuit; error integration; high-gain CMOS op-amp; input offset voltage compensation circuit; offset compensation; onchip continuous-time compensation circuit; operational amplifier; symmetrical architecture; Broadband amplifiers; Circuits; Convergence; FETs; Frequency; MOSFETs; Operational amplifiers; Steady-state; Switches; Voltage;

fLanguage

English

Journal_Title

Circuits and Systems I: Fundamental Theory and Applications, IEEE Transactions on

Publisher

ieee

ISSN

1057-7122

Type

jour

DOI

10.1109/81.660763

Filename

660763