CMOS differential amplifier having constant transconductance and

Details CMOS differential amplifier having constant transconductance and CMOS differential amplifier having constant transconductance and

1996-08-02

1998-04-28

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330258, H03F 345

Patent

active

057450072

ABSTRACT:
An amplifier, particularly a CMOS amplifier has a differential input which is fed to six differential pairs. The outputs of the first and third differential pair are combined and fed to inputs of a summing network, while the outputs of the fourth and fifth are combined and fed to inputs of the summing network. The second and sixth differential pairs are arranged to cancel the tail currents of the fifth and third pairs, respectively, when all of the devices are in their active state. Thus, regardless of the common mode input level with respect to the supply rails the output current is provided by four devices giving a constant g.sub.m and slew rate.

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patent: 5384548 (1995-01-01), Sakurai et al.
"A Low-Voltage CMOS Op Amp With A Rail-to-Rail Constant-gm Input Stage and A Class AB Rail-to-Rail Output Stage", by J.H. Botma et al, MESA Research Ins., The Netherlands, IEEE, 1993, pp. 1314-1317.

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