Filter using a state-variable biquadratic transfer function circ

Details Filter using a state-variable biquadratic transfer function circ Filter using a state-variable biquadratic transfer function circ

1979-05-08

1981-01-20

Dixon, H.

Amplifiers

Signal feedback

Phase shift means in loop path

328167, 330 76, H03F 136

Patent

active

042465427

ABSTRACT:
A second order section of an electronic filter comprises three cascaded amplifier stages and a compensating amplifier stage coupled between the first and second amplifier stages. The compensating stage introduces a leading phase shift at high frequencies so that the normalized transfer function of the circuit, for different frequencies, is substantially identical.

REFERENCES:
patent: 3696252 (1972-10-01), Chapman
patent: 3869084 (1975-03-01), Longman
patent: 3924199 (1975-12-01), Pearlman
Electronics, Jan. 20, 1977, pp. 112, 113, "Input Capacitance Feedback--" by Martin Thomas.
"A Versatile Second Order Active Filter" by Roy Electronic Engineering, Feb. 1974, pp. 64-68.

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