Dual conversion transmitter

Details Dual conversion transmitter Dual conversion transmitter

1993-07-14

1995-04-25

Eisenzopf, Reinhard J.

Telecommunications

Transmitter

Frequency conversion

455114, 455119, H04B 104

Patent

active

054107474

ABSTRACT:
A transmitter using a dual conversion system which effects frequency conversion twice has a local oscillator (113) for generating a first local oscillation signal, a multiplier (118) for multiplying the frequency of the first local oscillation signal to produce a second local oscillation signal, a first mixer (115) for mixing the first local oscillation signal and first IF signal to produce a second IF signal, and a second mixer (120) for mixing the second local oscillation signal and second IF signal to produce a signal to be transmitted. A voltage controlled filter (116) whose center frequency varies with the frequency of the first local oscillation signal is connected to the output of the first mixer (115).

REFERENCES:
patent: 4025855 (1977-05-01), Atkinson
patent: 4262361 (1982-04-01), Haver
patent: 4322995 (1982-04-01), Tavel
patent: 4458207 (1984-07-01), Favreau et al.
patent: 4581643 (1986-04-01), Carlson
patent: 5027430 (1991-06-01), Yamauchi et al.

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