Radio frequency transceiver and methods for noise reduction

The present invention discloses a radio frequency transceiver and methods for noise reduction which can be applied to a signal generating and transmitting device with a modulation circuit which the magnitude of voltage can be controlled. The radio transceiver module comprises: a voltage controlled o...

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Bibliographische Detailangaben
Hauptverfasser: CHEN, JAUN, LEE, KUEI-JU, CHANG, CHI-HO, HUANG, JUII, TSENG, CHI-HUA
Format: Patent
Sprache:chi ; eng
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Beschreibung
Zusammenfassung:The present invention discloses a radio frequency transceiver and methods for noise reduction which can be applied to a signal generating and transmitting device with a modulation circuit which the magnitude of voltage can be controlled. The radio transceiver module comprises: a voltage controlled oscillator electrically connected to the modulation circuit and can generate a signal with a continuous oscillation frequency ; a power distributer receives the oscillation signal and transmits from the different route to the radio frequency transmitting end through the low-pass filter and the mixer of the local oscillator according to the different output impedance respectively; a low pass filter receives and attenuates the high oscillation frequency signal with frequency higher than the working frequency, and transmits the enhanced low oscillation frequency signal with the frequency lower than the working frequency; a low noise amplifier used for receiving, amplifying and transmitting the target returned signal; a