Fully differential operational amplifier with fast settling...

Details Fully differential operational amplifier with fast settling... Fully differential operational amplifier with fast settling...

2007-09-04

2007-09-04

Nguyen, Khanh Van (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S258000

Reexamination Certificate

active

11181564

ABSTRACT:
An operational amplifier includes a pair of differential input transistors, a pair of cascode transistors and a keep-alive circuit. The pair of differential input transistors is connected together at the source terminals and the gate terminals of the input transistors receive a pair of differential input signals. Each cascode transistor is connected to a respective input transistor to form a cascode. The drain terminals of the pair of cascode transistors provide a pair of differential output signals. The keep-alive circuit is connected to provide first and second bias currents to the source terminals of the pair of cascode transistors. In operation, each of the first and second bias currents is a variable current being a function of a voltage at the source terminal of the respective cascode transistor. The first and second bias currents keep the pair of cascode transistors alive during transient overload conditions.

REFERENCES:
patent: 5847607 (1998-12-01), Lewicki et al.
patent: 6759898 (2004-07-01), Opris

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