Rail-to-rail input stages with g.sub.m -control by multiple inpu

Details Rail-to-rail input stages with g.sub.m -control by multiple inpu Rail-to-rail input stages with g.sub.m -control by multiple inpu

1995-04-27

1996-10-01

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330257, 330258, 330261, H03F 345

Patent

active

055613969

ABSTRACT:
A transconductance (g.sub.m) control circuit for bipolar or CMOS rail-to-rail input stages is provided. The g.sub.m is controlled by the use of multiple input pairs and can be used in CMOS or bipolar technology. In CMOS the g.sub.m -control works regardless of the operating region of the MOS transistor, whether it is weak, moderate or strong inversion.

REFERENCES:
patent: 4555673 (1985-11-01), Huijsing et al.
patent: 5208552 (1993-05-01), Ryat
patent: 5280199 (1994-01-01), Itakura
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" J. H. Botma et al, IEEE J. Solid State Circuits, vol. SC-20, pp. 1144-1150 Dec. 1985.
"CMOS Low-Voltage Operational Amplifiers with Constant Gm Rail-to-Rail Input Stage" R. Hogervorst et al, Proceedings Iscas 92, pp. 2876-2879.
"A Rail-to-Rail Input/Output CMOS Power Amplifier" M. D. Pardoen et al, IEEE J. Solid State Circuits, vol. SC 25, pp. 501-504 Dec. 1990.
"A Compact Power Efficient Rail-to-Rail Input/Output Amplifier for VLSI Cell Libraries" R. Hogervorst et al, Digest ISSCC94, Feb. 1994, pp. 2444-2445.
CMOS Low-Voltage Operational Amplifiers with Constant-g.sub.m Rail-to-Rail Input Stage, By Ron Hogervorst Et Al, Analog Integrated Circuits and Signal Processing 5, 135-146 (1994).
Low-Voltage Operational Amplifier with Rail-to-Rail Input and Output Ranges, by Johan H. Huijsing Et Al, IEEE, 1985, pp. 1114-1150.

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