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.