Synchronous tracking filter circuit for a broadcast satellite tu

Details Synchronous tracking filter circuit for a broadcast satellite tu Synchronous tracking filter circuit for a broadcast satellite tu

1995-11-20

1998-02-03

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

4551804, 4551912, 4551933, 455340, 455285, 455 32, H04B 110

Patent

active

057155313

ABSTRACT:
A synchronous tracking filter circuit for use in a broadcast satellite tuner that comprises four varactors and a strip-shaped inductor plate or pcb-printed strip line which produces a resonant frequency. The circuit is used in a doubly tuned resonant circuit to incorporate the tracking with the frequency changes of a voltage controlled oscillator (VCO) synchronously. The circuit can also control the image interference. This type of design is applicable in the tuner of an indoor broadcast satellite receiver unit to act as the synchronous tracking filter of input frequencies.

REFERENCES:
patent: 4662001 (1987-04-01), Cruz et al.
patent: 5285179 (1994-02-01), Wignot et al.
patent: 5619283 (1997-04-01), Pugel

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