Lowpass filter with electronic control of cutoff and resonance

Details Lowpass filter with electronic control of cutoff and resonance Lowpass filter with electronic control of cutoff and resonance

1980-12-30

1983-09-13

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including frequency-responsive means in the signal...

330257, 330288, 330305, 330306, H03G 522

Patent

active

044045298

ABSTRACT:
A lowpass filter circuit having an electronically controllable cutoff frequency and utilizing a feedback current mirror circuit as a variable impedance element. The filter circuit employs low noise, low distortion output circuitry and includes means for electronically controlling resonance.

REFERENCES:
patent: 3731215 (1973-05-01), Peil et al.
patent: 4288754 (1981-09-01), Okada et al.

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