CMOS differential operational amplifier

Details CMOS differential operational amplifier CMOS differential operational amplifier

1995-04-24

1996-11-26

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330258, H03F 345

Patent

active

055789641

ABSTRACT:
A CMOS differential operational amplifier has a fully differential structure to improve the output swing and a cascode amplification structure to improve the operating speed. This amplifier includes: a differential input stage 21 which receives differential input voltage signals and converts the input voltage signals into current signals; a cascode output stage 22 which amplifies the current signals from the differential input stage 21 and converts them into high gain output voltage signals; and a common-mode feedback circuit(CMF) 23 which makes a common-mode voltage signal of the output voltage signals equal to a reference voltage signal. To the output ports of the cascode output stage 22, a load capacitor (C.sub.L) 24 is connected.

REFERENCES:
patent: 5216380 (1993-06-01), Carbou

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