Active filter

Details Active filter Active filter

1975-02-06

1976-10-19

Mullins, James B.

Amplifiers

Signal feedback

Amplifier in signal feedback path

330107, H03F 136

Patent

active

039873706

ABSTRACT:
An active band-reject filter of the state-variable type is tuneable over a broad frequency range (three decades) while maintaining a substantial notch depth (50-80 db) which is essentially independent of component value or matching. The filter uses active amplifiers in the inverting mode only, to thereby enable use of inexpensive amplifiers which can be feed-forward compensated to increase their open loop gain and bandwidth. Low-pass, band-pass, and high-pass outputs are also provided, with the gain of the bandpass output at the center frequency being essentially flat over three decades of tuning. Provision is made for compensating for non-ideal behavior of both the active (amplifiers) and passive (capacitors) elements.

REFERENCES:
patent: 3747007 (1973-07-01), Geitner
patent: 3760287 (1973-09-01), Harris
perea et al., "Filtro Activo De Supresion De Banda Sintonizable De Q Variable," Revista Telegrafica Electronica, Mar. 1973, pp. 130, 133.
Girling et al., "Active Filters," Wireless World, Mar. 1970, pp. 134-139.
"Multiplier As A Variable Resistor Voltage-Controlled Active Filter," Electronic Engineering, Oct. 1972, p. 27.

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