Tail-current steering circuit and method for rail-to-rail...

Details Tail-current steering circuit and method for rail-to-rail... Tail-current steering circuit and method for rail-to-rail...

2007-01-19

2008-08-12

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S257000, C330S258000, C330S260000

Reexamination Certificate

active

07411453

ABSTRACT:
An amplifier includes first and second pairs of differentially coupled input transistors. The first current mirror generates a reference current which is mirrored by a second current mirror to produce a mirrored reference current. Current steering circuitry steers the mirrored reference current as a first tail current through the first pair when a common mode voltage associated with a differential input voltage exceeds a first reference voltage. A first portion of the mirrored reference current flows from the first current steering circuitry when the common mode voltage is greater than the first reference voltage to produce a second tail current for the second pair. A second portion of the mirrored reference current is fed back to an output of the first current mirror and summed with the reference current so as to reduce the second portion when the common mode voltage is greater than the first reference voltage.

REFERENCES:
patent: 5311145 (1994-05-01), Huijsing et al.
patent: 5392003 (1995-02-01), Nag et al.
patent: 6265941 (2001-07-01), Lopata
patent: 6366169 (2002-04-01), Ivanov
patent: 6972706 (2005-12-01), Snoeijs
patent: 7196581 (2007-03-01), Gammie et al.
patent: 7342450 (2008-03-01), Jones

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