Compact GM-control for CMOS rail-to-rail input stages by regulat

Details Compact GM-control for CMOS rail-to-rail input stages by regulat Compact GM-control for CMOS rail-to-rail input stages by regulat

1995-09-06

1997-05-20

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330258, 330261, H03F 345, H03F 316

Patent

active

056316070

ABSTRACT:
Compact g.sub.m -control circuits for CMOS rail-to-rail input stages operating in strong inversion are provided. The G.sub.m -control circuit makes the sum of the gate-source voltages of the complementary input transistors, and therefore the g.sub.m of the input stage constant. The compact g.sub.m -control circuits implement a floating voltage source in the form of circuit elements between the N and P-channel input stage transistors and the positive and negative supply rails of the operational amplifier.

REFERENCES:
patent: 4780688 (1988-10-01), Groom
patent: 5323120 (1994-06-01), Ryat
patent: 5371474 (1994-12-01), Wassenaar et al.
patent: 5412343 (1995-05-01), Rijns

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