Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Reexamination Certificate
2009-07-09
2010-12-14
Le, Dinh T. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
C327S552000
Reexamination Certificate
active
07852147
ABSTRACT:
An integrated circuit includes a signal-path filter, a high-pass filter, and a control circuit. The signal-path filter is configured to receive an input signal and provide an output signal. The high-pass filter is coupled to the signal-path filter and is configured to reduce a direct-current (DC) component of the input signal. The high-pass filter includes a metal-oxide-semiconductor (MOS) switch, wherein a corner frequency of the high-pass filter is based on a resistance of the MOS switch. The control circuit is configured to provide a control voltage to the MOS switch. The control circuit includes a reference resistor, wherein the resistance of the MOS switch substantially tracks the resistance of the reference resistor. The integrated circuit may be embodied in software and/or included in a device (e.g., a mobile telephone) that receives and filters a signal.
REFERENCES:
patent: 4494551 (1985-01-01), Little et al.
patent: 6873206 (2005-03-01), Hildebrant et al.
patent: 7005929 (2006-02-01), Smith
patent: 7471140 (2008-12-01), Salerno
Darabi Hooman
Hadji-Abdolhamid Amir
Mirzaei Ahmad
Broadcom Corporation
Le Dinh T.
Sterne Kessler Goldstein & Fox P.L.L.C.
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