Synchronous filter with switched capacitances

Details Synchronous filter with switched capacitances Synchronous filter with switched capacitances

1986-11-10

1988-07-05

LaRoche, Eugene R.

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

328151, H03H 701

Patent

active

047557796

ABSTRACT:
A synchronous filter for use as a narrow band, band-pass filter comprises a matching circuit receiving a signal to be filtered and supplying that signal to an output connected to filtering paths with switched capacitances connected in parallel. This filter also includes switches for switching the filtering paths, a summing circuit with inputs respectively connected to outputs of the filtering paths and a switch control circuit. Each filtering path has two identical filtering channels, each with a capacitance, connected to the switches. The switching control signals are symmetrical for the two channels of each path and staggered by T/2N. The sampling periods or cycles of the two channels of one path are equal to T/2.

REFERENCES:
patent: 3793599 (1974-02-01), Coor
patent: 4319207 (1982-03-01), Gignoux
patent: 4378538 (1983-03-01), Gignoux
Journal "Electronics Letters", vol. 15, Aug. 1979, No. 16.

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