Patent ID: 6600370
Filing Date: 2003-07-29
Classification: H03F

Abstract:
An intermodulation signal detector for use in a super high frequency circuit, comprising:a first power dividing means for dividing the power of a super high frequency signal inputted from the outside through a super high frequency transmission line, and outputting a power-divided signal; a clock generating means for producing a clock signal; a varying means for receiving the power-divided signal from the first power dividing means, attenuating an amplitude of the power-divided signal according to an amplitude control signal, converting a phase of the power-divided signal in response to a phase control signal and providing a converted super high frequency signal having converted amplitude and phase; a non-linear super high frequency element for receiving the converted super high frequency signal and generating an output signal including the converted super high frequency signal and an intermodulation signal produced therein; a second power dividing means for receiving the output signal of the non-linear super high frequency element, dividing the power of the output signal and outputting a power-divided output signal as a comparison signal; a third power dividing means for receiving the power-divided signal from the first power dividing means, dividing the power of the power-divided signal and outputting a twice power-divided signal as a reference signal; a power combining means for receiving the comparison signal and the reference signal and combining the received two signals to thereby detect the intermodulation signal; a phase control means for receiving the comparison signal and the reference signal and generating DC voltages having amplitudes corresponding to the phases of two received signals to thereby produce the phase control signal for making 180Â° phase difference between the comparison signal and the reference signal; and an amplitude control means for receiving the comparison signal and the reference signal and generating DC voltages having amplitudes corresponding to the amplitudes of two received signals to thereby produce the amplitude control signal for making the amplitude of the comparison signal identical to that of the reference signal.