Active filter calibration method and apparatus

Details Active filter calibration method and apparatus Active filter calibration method and apparatus

2009-03-02

2010-11-30

Nguyen, Hai L (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

Reexamination Certificate

active

07843257

ABSTRACT:
An example bandpass filter calibration system includes a MUX, first and second signal sources coupled to inputs of the MUX, a bandpass filter coupled to an output of the MUX, a rectification circuit including a plurality of rectifiers having a corresponding plurality of rectifier outputs coupled to an output of the bandpass filter, a summer having a plurality of inputs coupled to the plurality of rectifier outputs, a low pass filter coupled to an output of the summer, an ADC coupled to an output of the low pass filter, and a calibration processor unit coupled to an output of the ADC. The calibration processor unit controls the MUX to selectively apply the first signal source and the second signal source to the bandpass filter and calibrates the bandpass filter by a least one of increasing filter center frequency and decreasing filter center frequency of the bandpass filter.

REFERENCES:
patent: 6452444 (2002-09-01), Mehr
patent: 6803813 (2004-10-01), Pham
patent: 7078961 (2006-07-01), Punzenberger et al.
patent: 7471142 (2008-12-01), Li et al.
patent: 7477099 (2009-01-01), Okamoto et al.

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