Apparatus and method for tuning center frequency of a filter

Details Apparatus and method for tuning center frequency of a filter Apparatus and method for tuning center frequency of a filter

2008-06-16

2009-12-01

Mis, David (Department: 2817)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

C327S103000, C327S513000, C327S553000, C327S562000, C327S563000, C330S253000, C330S254000, C330S289000, C331S017000, C331S059000

Reexamination Certificate

active

07626449

ABSTRACT:
A method for tuning a filter is provided. The method includes: enabling a VCO circuit, wherein at least a portion of the VCO circuit is selected from the filter; generating an oscillation signal by the VCO circuit according to a driving signal; comparing the oscillation signal with a reference signal and generating a comparison result; and adjusting the driving signal according to the comparison result.

REFERENCES:
patent: 6737919 (2004-05-01), Cyrusian
patent: 6914489 (2005-07-01), Charlon
patent: 7403063 (2008-07-01), Tu et al.

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