Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude
Reexamination Certificate
2007-05-22
2007-05-22
Callahan, Timothy P. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By amplitude
C327S563000
Reexamination Certificate
active
11079711
ABSTRACT:
A system and method is provided for extending the range of a common mode voltage of a differential comparator. In one embodiment, a differential comparator comprises an input stage with a negative voltage reference node, a first differential input coupled to a first differential pair transistor and operative to receive a first input signal, and a second differential input coupled to a second differential pair transistor and operative to receive a second input signal. The first input signal and the second input signal form a differential input signal. The differential comparator further comprises a common mode sensing circuit interconnected between the first differential input, the second differential input, and the negative voltage reference node. The common mode sensing circuit is operative to sense a common mode voltage of the differential input signal and set a voltage potential at the negative voltage reference node substantially equal to the sensed common mode voltage.
REFERENCES:
patent: 5512848 (1996-04-01), Yaklin
patent: 6255863 (2001-07-01), Yamauchi et al.
patent: 6504404 (2003-01-01), Uchiki et al.
Jordanger Ricky Dale
Partow Anthony Sepehr
Brady III W. James
Callahan Timothy P.
Englund Terry L.
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
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