Matched filters for processing related signal components

Details Matched filters for processing related signal components Matched filters for processing related signal components

1995-12-13

1997-04-01

Mis, David

Modulators

Phase shift keying modulator or quadrature amplitude modulator

327558, 332100, 332123, 375298, 375296, 455110, H03C 300, H04L 2712, H04L 2720, H04L 2736

Patent

active

056170637

ABSTRACT:
A circuit for processing related signal components, such as in-phase and quadrature signal components generated within a modulator, in which a first filter and a second filter are matched such that the gain of each such filter is nearly identical. A modulator is provided having matched filters in accordance with the present invention in which the gain "K" of each filter is equal to 1. By using a filter which has a gain of 1, the gain is removed from consideration when attempting to match the filter response of one filter to another. Furthermore, each filter is relatively simple to implement, having only four resistors, two capacitors, and two operational amplifiers.

REFERENCES:
patent: 3259692 (1966-07-01), Aspinwall
patent: 4086536 (1978-04-01), Acker
Bainter, J.R.; "Active Filter Has Stable Notch, And Response Can Be Regulated"; Electronics; Oct. 2, 1975; pp. 115-117.

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