POWER FEEDER OF RADIO FREQUENCY MODULE(RF-MODULE)

摘要

PURPOSE: A device is provided to increase use hours of a battery of a cellular phone by cutting off the power supply to the unnecessary devices by using the Lock detection signal of Phase Locked Loop(PLL) as a control signal of a switch. CONSTITUTION: A power feeder comprises: an antenna(10); a duplexer(20) to perform the transmit conversion; a receiving part(30) to generate intermediate frequency signal; a Frequency Modulation detector(40) to restore the intermediate frequency signal to the original signal; an RX to generate the Lock detection signal; TX two stage PLL(50); an RX VCO(60) to generate the RX oscillation frequency; a TX VCO(70) to generate the TX oscillation frequency; a transmitting part(80) to amplify and transmit the power of the transmission frequency signal; a RX PLL switch(91); a receiving part switch(92); a TX PLL switch(93); a transmitting part switch(94); and a microprocessor(100) to open and shut the switches(91, 92, 93, 94).