Patent ID: 7158766

Claim:
A radio transceiver comprising: an antenna unit configured to convert the electromagnetic wave to a received signal; a receiver including frequency characteristic compensators configured to generate first and second in-phase signals having a same phase of the received signal and a compensation current based on a capacitance determined by the second in-phase signal to generate a first feedback signal, and to supply the compensation current thorough a first feedback signal to an output capacitance, the receiver comprising: a low noise amplifier connected to the antenna unit; a mixer connected to output sides of the low noise amplifier and a local oscillator; an automatic gain control amplifier connected to an output side of the mixer, the automatic gain control amplifier including: a plurality of cascade connected wideband amplifiers; and a gain controller connected to all of the wideband amplifiers; and a quadrature demodulator connected to an output side of the automatic gain control amplifier; a transmitter configured to supply a transmitting signal to the antenna unit; a local oscillator configured to generate a clock for the receiver and the transmitter; and a baseband circuit configured to process the received signal fed from the receiver and to generate the transmitted signal to be supplied to the transmitter, wherein each of the wideband amplifier comprises: an amplifier configured to generate a first amplification signal from the received signal; and a frequency characteristic compensator configured to generate a first and second in-phase signal having a same phase of the first amplification signal, and to transfer a first compensation current to a load having an input capacitance or an output capacitance, the first compensation current being generated by the second-in-phase signal.