Matsushita Electric Industrial Co., Ltd.

Tetsu Takase

Makoto Takemoto

Jun Shibata

Katsuyuki Kawase

While a spectrum waveform of an output signal from a subtracter () is visibly monitored, an operator controls a variable phases shifter () based upon a second control signal (CL) so that a shape of a spectrum waveform of an output signal from a subtracter () is approximated to a spectrum waveform of a desirable wave to change a phase of a local oscillation frequency signal from a local oscillator (). As a result, a phase of a duplicated loop signal is changed. Also, the operator controls a variable attenuator () based upon a first control signal (CL) so that a shape of this spectrum waveform is approximated to a spectrum waveform of a desirable wave () to change a signal level of the duplicated loop signal.

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Yokohama, Japan

Tetsu Takase