Dual conversion radio frequency transceiver

Details Dual conversion radio frequency transceiver Dual conversion radio frequency transceiver

1997-04-08

2000-09-12

Vo, Nguyen

Telecommunications

Transmitter and receiver at same station

With frequency stabilization

455 86, H04B 140

Patent

active

061189847

ABSTRACT:
The present invention discloses a dual conversion RF transceiver which uses only one local oscillator for signal conversion to simplify system complexity and reduce production cost. The transceiver comprises a mixer for mixing input RF signals with first local oscillator signal to generate a first IF signal, an IF filter for filtering the first IF signal, a local oscillator for providing second local oscillator signal, a demodulator for demodulating the filtered first IF signal into first baseband signals by using the second oscillator signal, a baseband circuit for processing the first baseband signals and generating second baseband signals to be transmitted, a modulator for modulating the second baseband signals into a second IF signal by using the second local oscillator signal, and a frequency multiplier for multiplying the frequency of the second IF signal by a predetermined factor to generate a output RF signal. When the transceiver starts receiving the RF signals, the baseband circuit will produce a fixed baseband signal which will be modulated into fixed frequency signal by the modulator by using the second local oscillator signal. And the frequency of the fixed frequency signal will be multiplied by the frequency multiplier to generate the first local oscillator signal.

REFERENCES:
patent: 4520474 (1985-05-01), Vilmur
patent: 4542531 (1985-09-01), Fukumura
patent: 5825813 (1998-10-01), Na

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