Band-pass filter

Wave transmission lines and networks – Coupling networks – Frequency or time domain filters and delay lines utilizing...

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Details

307221D, 333172, 333173, 333174, H03H 710, H03H 730, H03K 5153, H03K 5159

Patent

active

042186650

ABSTRACT:
A bandpass filter is disclosed which includes a low-pass filter and an analog delay circuit in which the delay time is set by a clock signal. THe analog delay circuit samples the voltage of the low-pass filter capacitor and delays the sampled voltage according to the clock signal. The output of the analog delay circuit is then used to equalize within a certain period of time the voltage of the low-pass filter capacitor. The analog delay circuit may consist of an integrated circuit BBD (Bucket Brigade Device) or CCD (Charge Coupled Device).

REFERENCES:
patent: 2752491 (1956-06-01), Ringoen
patent: 3526858 (1970-09-01), Heinlein et al.
patent: 3531741 (1970-09-01), Langer
patent: 3603898 (1971-09-01), Dawson et al.
patent: 3783413 (1974-01-01), Froment et al.
Harden-"Digital Filters With IC's Boost Q Without Inductors" in Electronics, Jul. 24, 1967; pp. 91-100.
Franks et al.-"An Alternative Approach to the Realization of Network Functions; The N-Path Filter" in the Bell System Technical Journal; 9/1960; pp. 1321-1350.

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