CMOS class AB folded cascode operational amplifier for...

Details CMOS class AB folded cascode operational amplifier for... CMOS class AB folded cascode operational amplifier for...

2007-02-13

2007-02-13

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S257000, C330S258000

Reexamination Certificate

active

11096321

ABSTRACT:
An operational amplifier (1A or1B) includes a translinear transconductance stage (2B or2C) receiving an input signal (Vin) of the operational amplifier and operative to produce a first current (ID18) having a square-law relationship to the input signal (Vin) and a folded cascode operational amplifier (3B) including a differential input stage coupled to receive the input signal (Vin), a folded cascode stage coupled to the differential input stage, and a class AB output stage (45) coupled to the folded cascode stage. The differential input stage includes a tail current source (34) coupled to the translinear transconductance stage and operative to produce a square-law tail current (ID34) scaled to the first current (IDI8) to provide a substantially constant input transconductance for a relatively large range of magnitudes of the input signal (Vin).

REFERENCES:
patent: 5631607 (1997-05-01), Huijsing et al.
patent: 5909136 (1999-06-01), Kimura
patent: 6377085 (2002-04-01), Giuroiu
patent: 6657486 (2003-12-01), Kimura
patent: 6710654 (2004-03-01), Parkhurst et al.
patent: 6822505 (2004-11-01), Palaskas et al.
patent: 2001/0001232 (2001-05-01), Kung

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