Frequency conversion unit

Details Frequency conversion unit Frequency conversion unit

1983-04-05

1985-04-02

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

455325, 455327, 455330, 455332, 332 43B, H04B 126

Patent

active

045092087

ABSTRACT:
A frequency conversion unit comprising a local oscillator, first and second mixers, first and second hybrid circuits. The mixers receive, via the first hybrid circuit, local oscillation outputs from the local oscillator, and the second hybrid circuit receives outputs from the first and second mixers, producing a frequency conversion output signal therefrom. Intermediate frequency signals used in the first and second mixers are .pi. radians out of phase with each other. The first hybrid circuit produces outputs for the first and second mixers having a predetermined phase difference of .phi..sub.1 therebetween. The second hybrid circuit receives outputs from the first and second mixers and combines them after making a phase difference of (.pi.-.phi..sub.1) therebetween.

REFERENCES:
patent: 3159790 (1964-12-01), Pratt
patent: 3233194 (1966-02-01), Alford
patent: 3243731 (1966-03-01), Erickson
patent: 3515993 (1970-06-01), Merriam
patent: 3681697 (1972-08-01), Moroney
patent: 3831097 (1974-08-01), Neuf
patent: 3870960 (1975-03-01), Hallford et al.
patent: 4099126 (1978-07-01), Hallford
patent: 4118670 (1978-10-01), Dickens
patent: 4249263 (1981-02-01), Shinkawa et al.
patent: 4355420 (1982-10-01), Ishihara
"Phase and Amplitude Balance: Key to Image Rejection Mixers", Microwaves, Oct. 1972, pp. 64-70.
European Search Report, Dated: Aug. 1, 1983, Examiner: J. Breusing, Place: Berlin.

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