Dual-stage filter with feedback

Details Dual-stage filter with feedback Dual-stage filter with feedback

1985-04-12

1986-01-07

LaRoche, Eugene R.

Amplifiers

Signal feedback

Phase shift means in loop path

330294, 330310, H03F 134, H03F 368

Patent

active

045636524

ABSTRACT:
A dual-stage band pass-band reject filter with feedback. Two state variable band pass filters with identical topology are cascaded as first and second stages. Each stage employs two inverting adders and two inverting integrators in a state variable topology, and each provides a band pass output and a band reject output. Both stages are selectively tuned to the same fundamental frequency. The filter output may be switched from a band pass to a band reject mode. In the band reject mode decreased attenuation of harmonics of the fundamental frequency is achieved by providing a predetermined amount of feedback from either the band reject output or band pass output of the second stage to the input of a respective one of the two adders of the first stage.

REFERENCES:
patent: 4189681 (1980-02-01), Lawson et al.
patent: 4207543 (1980-06-01), Izakson et al.

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