Miscellaneous active electrical nonlinear devices – circuits – and – Gating – Parallel controlled paths
Reexamination Certificate
2006-03-14
2006-03-14
Nguyen, Long (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Gating
Parallel controlled paths
C327S408000, C327S099000, C330S009000
Reexamination Certificate
active
07012458
ABSTRACT:
An analog switching circuit selects one of a first pair of differential outputs of a first circuit having a first common mode voltage and a second pair of differential outputs of a second circuit having a second common mode voltage. The analog switching circuit includes first and second switches having one of a source and drain that communicate with the first pair of differential outputs. Third and fourth switches have one of a source and drain that communicate with the second pair of differential outputs. An operational amplifier has a first input that communicates with the other of the source and drain of the first and third switches and a second input that communicates with the other of the source and drain of the second and fourth switches. A common mode feedback circuit communicates with the first and second inputs of the operational amplifier and maintains a common mode voltage input of the amplifier below the first and second common mode voltages.
REFERENCES:
patent: 4191900 (1980-03-01), Redfern et al.
patent: 4547683 (1985-10-01), Bingham
patent: 5936469 (1999-08-01), Alexander et al.
patent: 6900686 (2005-05-01), Roo
patent: 2003/0080800 (2003-05-01), Kuttner
U.S. Appl. No. 10/106,720, filed Mar. 26, 2002.
U.S. Appl. No. 10/358,709, filed Feb. 5, 2003.
Marvel International LTD
Nguyen Long
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