On-chip self-tuning filter system

Details On-chip self-tuning filter system On-chip self-tuning filter system

1992-10-08

1994-01-25

Pascal, Robert J.

Wave transmission lines and networks

Automatically controlled systems

455125, 333174, 307521, H03G 1104, H04B 304

Patent

active

052819310

ABSTRACT:
An on-chip apparatus and method are provided for automatically tuning a continuous time filter in which a single filter selectively filters an information signal or, when tuning is desired, an unfiltered reference signal. During tuning, a controller determines the amplitudes of the unfiltered and filtered reference signals and their ratio. From the ratio, the controller ascertains a corresponding center or tuned frequency of the filter. If the ascertained frequency does not substantially equal a desired tuned frequency, the controller directs a bias controller to adjust the bias of the filter until the tuned frequency is substantially equal to the desired tuned frequency.

REFERENCES:
patent: 3978420 (1976-08-01), Lane
patent: 4451792 (1984-05-01), Gay
patent: 4726071 (1988-02-01), Jachowski
patent: 4733205 (1988-03-01), Hughes
patent: 4801888 (1989-01-01), Hague
patent: 5063309 (1991-11-01), Yamasari
patent: 5072298 (1991-12-01), Sumiyoshi

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