Single side band harmonic frequency converter, in particular for

Details Single side band harmonic frequency converter, in particular for Single side band harmonic frequency converter, in particular for

1986-11-06

1989-03-28

Safourek, Benedict V.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

455326, 455330, H04B 126

Patent

active

048172014

ABSTRACT:
Two harmonic mixers arranged in parallel are connected to a first signal frequency gate and to a second local frequency gate by means of a single radiofrequency hybrid circuit in quadrature or by means of respective hybrid circuits of which one in quadrature and centered on the signal frequency and the other in phase, quadrature or opposition of phase and centered on the local frequency. Another intermediate frequency hybrid circuit in quadrature connects the two mixers to a third intermediate frequency gate and to a fourth gate closable on a termination. In this manner there is obtained a harmonic frequency conversion with image suppression.

REFERENCES:
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patent: 2872647 (1949-02-01), Smith
patent: 3029396 (1955-12-01), Sichak
patent: 3041452 (1962-06-01), Robertson et al.
patent: 3233194 (1966-02-01), Alford
patent: 3515993 (1970-06-01), Merriam
patent: 3681697 (1972-08-01), Moroney
patent: 4245355 (1981-01-01), Pascoe et al.
patent: 4355420 (1982-10-01), Ishihara
patent: 4485488 (1984-11-01), Houdart
patent: 4603435 (1986-07-01), Butler
Pat. Absts. of Japan; vol. 1, #146 (E77); Nov. 26, 1977; p. 7547 E77; Pat. Pub. #52-86760; "Phase Difference Modulation Circuit."
Pat. Absts. of Japan; vol. 7, #40 (E159); Feb. 17, 1983; p. 1185 E159; Pat. Pub. #57-193106; "Image Cancellation Type Frequency Converter."

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