Bandpass filter having low passband phase shift

Details Bandpass filter having low passband phase shift Bandpass filter having low passband phase shift

1978-09-29

1980-02-19

Mullins, James B.

Amplifiers

Signal feedback

Frequency responsive feedback means

330294, H03F 134

Patent

active

041896815

ABSTRACT:
An active filter which can achieve extremely high attenuation of frequencies outside the passband while maintaining a very low phase shift of signals within the passband. A preferred embodiment is described in which two, second-order, multiple-feedback, active filter circuits are cascaded and the output of the second filter is fedback to the input of the first filter to realize a fourth-order filter which has very high attenuation of signals falling outside the passband while providing very low phase shifts of signals within the passband.

REFERENCES:
patent: 3361991 (1968-01-01), Wyndrum
patent: 3659212 (1972-04-01), Saliga
patent: 4015224 (1977-03-01), Benzinger
patent: 4057766 (1977-11-01), Lee

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