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

2008-07-22

2008-07-22

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

11554035

ABSTRACT:
A tuning method and a tuning apparatus for tuning a filter are disclosed. The tuning method includes: configuring the filter as a VCO; utilizing the VCO to generate an oscillation signal according to a driving signal; comparing a frequency of the oscillation signal with a reference frequency to generate a comparison result; converting the comparison result into the driving signal in order to establish a feedback mechanism. Therefore, the inner components such as the gm and capacitance inside the VCO are completely tuned when the VCO generates an oscillation signal having a wanted frequency. Since the VCO is inside the filter and the components of the filter and the VCO are similar, the driving signal can be utilized to make the filter operate in a desired center frequency under a well-designed relationship between the frequency of the oscillation signal and the center frequency.

REFERENCES:
patent: 6737919 (2004-05-01), Cyrusian
patent: 6914489 (2005-07-01), Charlon

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