Interference-free broadband television tuner

Details Interference-free broadband television tuner Interference-free broadband television tuner

1997-08-01

1998-12-08

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural oscillators controlled

331 16, 331 39, 331 41, 455260, 455316, 455318, H03L 707, H03L 716, H04B 126, H04B 1500

Patent

active

058476121

ABSTRACT:
An interference free local oscillator circuit is disclosed. A first local oscillator signal is generated in a first phase locked loop. A second local oscillator signal is generated in a second phase locked loop. Third and fourth phase locked loops provide inputs to the second phase locked loop to control the second local oscillator frequency. The operating frequencies of the first and second local oscillator signals are selected so that spurious signals generated in the phase locked loops do not interfere with a received RF signal in a conversion circuit.

REFERENCES:
patent: 4512035 (1985-04-01), Victor et al.
patent: 4551856 (1985-11-01), Victor et al.
patent: 5640697 (1997-06-01), Orndorff

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