Highly selective programmable filter module

Details Highly selective programmable filter module Highly selective programmable filter module

1977-04-27

1979-02-20

Griffin, Robert L.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

333 70T, 328133, 325 25, H04B 138

Patent

active

041409752

ABSTRACT:
A programmable filter module includes a charge transfer device bandpass filter and a phase locked loop. The bandpass filter has a plurality of passbands dependent upon the frequency of a clocking signal. The phase locked loop receives a reference signal of one frequency and in response thereto, generates the clocking signals in the form N1 divided by N2 times the frequency of the reference signal, where N1 and N2 are programmable integers.

REFERENCES:
patent: 3809923 (1974-05-01), Esser
patent: 3953745 (1976-04-01), Bailey
patent: 3978416 (1976-08-01), Sutphin
patent: 3983484 (1976-09-01), Hodama
patent: 3997973 (1976-12-01), Buss
The Design and Operation of Practical Charge-Transfer Transversal Filters. IEEE Transaction vol. Ed-23, #2, Feb. 1976, pp. 133-141.
Programmable Transversal Filtering Using the Surface-Acoustic-Wave Diode Convolver, Grant et al., Wave Electronics 1 (1974/1976), pp. 381-386.

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