Switched capacitor filters with continuous time control

Details Switched capacitor filters with continuous time control Switched capacitor filters with continuous time control

1990-03-21

1991-07-02

LaRoche, Eugene R.

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

333 81R, 330 51, H03H 700

Patent

active

050288938

ABSTRACT:
An ajustable switched capacitor circuit comprises a first stage, a second stage and a switched capacitor circuit coupling the output of the first stage to the input of the second stage. The operating parameters of the second stage are a function of the effective resistance of the switched capacitor coupling circuit. An attenuator interposed between the output of the first stage and the input of the switched capacitor coupling circuit controls the charging voltage of the switched capacitor coupler thereby controlling its effective resistance and parameters of the output stage. The signal loss through the attenuator is continuously adjustable responsive to an external control voltage to obtain continuous control of various output stage parameters. The output stage may comprise a filter having the parameters of its transfer function determined by the effective resistance of the switched capacitor coupling circuit.

REFERENCES:
patent: 4468749 (1984-08-01), Kato et al.
patent: 4634997 (1987-01-01), Tompsett et al.
patent: 4721923 (1988-01-01), Bares et al.
patent: 4866779 (1989-09-01), Kennedy et al.

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