Method and apparatus for filter tuning

Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression

Reexamination Certificate

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Details

C327S558000, C327S337000

Reexamination Certificate

active

06677814

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates generally to the field of communications devices and, more specifically, to filter tuning.
BACKGROUND OF THE INVENTION
In many filter circuit designs, resistance and capacitance are basic, yet critical design elements. A filter circuit is designed to function with particular results based on definite resistance and capacitance values. However, when the filter circuit is included within an integrated chip (IC), slight fabrication errors cause variations in the values of the resistors and capacitors in the filter circuit. These variations can be as large as ±20% for resistors and ±15% for capacitors. Thus, with variations so large, the filter circuit may exhibit significant errors in the filter response. Consequently, to overcome the undesirable variations in resistors and capacitors, a tuning circuit is required.


REFERENCES:
patent: 5187445 (1993-02-01), Jackson
patent: 5245646 (1993-09-01), Jackson et al.
patent: 5625316 (1997-04-01), Chambers et al.
patent: 5914633 (1999-06-01), Comino et al.
PCT Search Report for PCT/US 03/01302, 5 pages, Jun. 3, 2003.

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