Frequency converter used for a receiver which receives signals o

Details Frequency converter used for a receiver which receives signals o Frequency converter used for a receiver which receives signals o

1986-02-10

1988-03-15

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

455303, 455304, 455317, 455318, 455327, H04B 110

Patent

active

047318759

ABSTRACT:
A frequency converter which is capable of rejecting unnecessary signals generated by image signals. The frequency converter has first and second local oscillation circuits which generate local oscillation signals whose frequencies are the same and whose phases are different by 90 degrees from each other. The converter further includes two mixer circuits, and a hybrid coupler. The mixer circuits generate two unnecessary signals whose phases are different by 90 degrees from each other. The hybrid coupler delays one unnecessary signal by a quarter of a wavelength to generate two unnecessary signals whose phases are different by 180 degrees from each other, so that they are cancelled by each other.

REFERENCES:
patent: 2964622 (1960-12-01), Fire
patent: 3159790 (1964-12-01), Pratt
patent: 3515993 (1970-06-01), Merriam
patent: 3831097 (1974-08-01), Neuf
patent: 4584715 (1986-04-01), Baars et al.

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