Patent ID: 6308047
Filing Date: 2001-10-23
Classification: H03G,H04B

Abstract:
A radio-frequency integrated circuit comprising:a substrate;a radio-frequency processing circuit includinga first field effect transistor, receiving a radio-frequency input signal within a frequency band, and transferring a signal corresponding to the radio-frequency input signal, anda transmission/reception multiplexing switch having a transmission mode for transferring from a transmission signal input node the signal corresponding to the radio-frequency input signal to a transmission/reception node, coupled to an antenna, via a second field effect transistor, and a reception node for transferring a radio-frequency signal applied to said transmission/reception node from the antenna to a reception signal output node via a third field effect transistor;a control voltage generating circuit applying an operation control voltage to a gate of said first field effect transistor through a control voltage path different from a transmission path of the radio-frequency input signal and including a transmission/reception control circuit for applying a control voltage for turning on and off the second and third field effect transistors in accordance with an operation mode, said radio-frequency processing circuit and said control voltage generating circuit being integrated on said substrate; anda low pass filter for removing a signal in the frequency band of the radio-frequency input signal and connected in the control voltage path.