Frequency converter capable of eliminating local power leak

Details Frequency converter capable of eliminating local power leak Frequency converter capable of eliminating local power leak

1980-12-02

1982-10-19

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

455319, 455326, 455330, H04B 126, H04B 110

Patent

active

043554202

ABSTRACT:
A frequency converter has first, second and third terminals which receive a first signal having a first frequency band, a local oscillation signal, and a second signal having a second frequency band. The first signal and the local oscillation signal are mixed to generate the second signal. A first branching circuit is connected between the second terminal and the frequency mixer, for branching part of the local oscillation signal. A first part of the branched local oscillation signal, which is supplied from the first branching circuit, and a first leaked local oscillation signal are applied from the frequency mixer to the first terminal. The phase and amplitude of the first branched local oscillation signal are adjusted so that the first branched local oscillation signal and the first leaked local oscillation signal have equal amplitude and are reversed in phase to cancel each other.

REFERENCES:
patent: 3515993 (1970-06-01), Merriam
R. B. Mouw et al., "Broad-Band Double Balanced Mixer/Modulators" in the Microwave Journal, Mar. 1969.

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