Tracking image frequency trap

Details Tracking image frequency trap Tracking image frequency trap

1985-02-28

1986-07-15

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

With wave collector

455286, 455306, 455307, 455340, 455302, 333176, H04B 110, H04B 1500

Patent

active

046010629

ABSTRACT:
In a superheterodyne receiver, such as a typical television receiver, a radio frequency coupling arrangement includes a first resonant circuit coupled to receive the input signal and further coupled to a second resonant circuit by a first coupling. Both resonant circuits are tuned to the desired signal frequency. The capacitive branch of the first resonant circuit includes a circuit impedance for providing a neutralizing voltage, at least a portion of which is coupled by a second coupling to the inductive branch of the second resonant circuit. The circuit impedance is selected to cause cancellation in the inductive branch between image frequency components coupled by the first coupling and image frequency components coupled by the second coupling, without substantially affecting the desired signals.

REFERENCES:
patent: 2075683 (1937-03-01), Wheeler
patent: 2250277 (1941-07-01), Schaper
patent: 2449148 (1948-09-01), Sands
patent: 3487339 (1969-12-01), Griepentrog
patent: 3519737 (1970-07-01), Marsh, Jr.
"Radio Receiver Design", by K. R. Sturley, published by Chapman & Hall, Ltd., London; 1953, pp. 349-353 Discloses Image Suppression Circuits by Neutralizing Feedback Voltage.
"Radio Engineers' Handbook", by F. E. Terman, published by McGraw-Hill Book Company, Inc., New York; 1943, p. 645.

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