Operational amplifier arrangement including a quiescent...

Details Operational amplifier arrangement including a quiescent... Operational amplifier arrangement including a quiescent...

2005-03-15

2005-03-15

Mottola, Steven J. (Department: 2817)

Amplifiers

Sum and difference amplifiers

C330S258000

Reexamination Certificate

active

06867647

ABSTRACT:
An operational amplifier arrangement (OAA) includes a differential output stage (OS), input terminals of which are coupled to respective output terminals of a preceding stage (A2, A3), said operational amplifier arrangement (OAA) further includes a quiescent current control circuit (QCCC) coupled between said output stage (OS) and said preceding stage (A2, A3) and adapted to control the quiescent current of said differential output stage (OS) by commonly and simultaneously tuning respective input offset voltages (VoffA2, VoffA3) of said preceding stage (A2, A3), is characterised in that said quiescent current control circuit (QCCC) is adapted to digitally and off-line tune said input offset voltages of said preceding stage.

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Casier H et al. “A 3.3-V, Low-Distortion ISDN Line Driver with a Novel Quiescent Current Control Circuit” IEEE Journal of Solid-State Circuits, IEEE Inc. New York, US. vol. 33, No. 7, Jul. 1998, pp. 1130-1133, XP000849173.

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