A programmable 3-V CMOS rail-to-rail opamp with gain boosting for driving heavy resistive loads

Author

Hogervorst, Ron ; Safai, S. Morteza ; Tero, John P. ; Huijsing, Johan H.

Author_Institution

Fac. of Electr. Eng., Delft Univ. of Technol., Netherlands

Volume

2

fYear

1995

fDate

30 Apr-3 May 1995

Firstpage

1544

Abstract

This paper describes a programmable 3-V CMOS rail-to-rail opamp with gain boosting. The unity-gain frequency can be programmed from 0.5 to 4 MHz, for a load of 50 pF, by changing the supply current from 55 to 390 μA. The g_m-control of the input stage functions regardless of its operating region, whether it is weak or strong inversion. This allows an optimal frequency compensation over the total programming range. The opamp features a low-voltage gain-boosting technique which provides a high gain of about 120 dB, even for loads of 50 Ω. The opamp has been designed in a 1 μm BiCMOS process

Keywords

CMOS analogue integrated circuits; compensation; differential amplifiers; operational amplifiers; 0.5 to 4 MHz; 1 micron; 120 dB; 3 V; 55 to 390 muA; BiCMOS process; CMOS rail-to-rail opamp; LV gain boosting; heavy resistive load driving; optimal frequency compensation; programmable opamp; BiCMOS integrated circuits; Boosting; CMOS technology; Current supplies; Frequency; Functional programming; Rail to rail inputs; Resists; Summing circuits; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1995. ISCAS '95., 1995 IEEE International Symposium on

Conference_Location

Seattle, WA

Print_ISBN

0-7803-2570-2

Type

conf

DOI

10.1109/ISCAS.1995.521430

Filename

521430