Miscellaneous active electrical nonlinear devices – circuits – and – Gating – Utilizing three or more electrode solid-state device
Reexamination Certificate
2006-09-05
2006-09-05
Le, Dinh T. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Gating
Utilizing three or more electrode solid-state device
C381S104000, C381S107000, C330S297000
Reexamination Certificate
active
07102414
ABSTRACT:
A muting circuit for an audio amplifier comprises differential pairs of MOS transistors in a differential amplifier and two sets of MOS transistor switch to control the differential pairs respectively. The differential pairs are connected with a current mirror circuit and the two sets of MOS transistor switch control the first differential pair and the second differential pair of the differential pairs respectively. A muting signal controls one of the two sets of MOS transistor switch through an inverter, while controls the other of the two sets of MOS transistor switch via two inverters connected in series, so that the muting signal is able to open/close the first differential pair or the second differential pair to form a muting effect.
REFERENCES:
patent: 4398060 (1983-08-01), Ienaka et al.
patent: 5166983 (1992-11-01), Susak
patent: 5825251 (1998-10-01), Nakagawa
Birch & Stewart Kolasch & Birch, LLP
Le Dinh T.
Princeton Technology Corporation
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