| 摘要 |
PURPOSE:To lower the dynamic frequency of a circuit element and make the design and adjustment easy, by supplying a frequency-converted phase shift keying signal to a phase detector and detecting synchronously with a frequency- divided reproduced carrier wave signal. CONSTITUTION:A phase shift keying PSK signal in frequency omega1 inputted to a frequency converter 12' is frequency-converted in frequency omega0 of a voltage controlled oscillator VCO 24. The output signal is multiplied by (n) at an n- multiplier 10' and a carrier component signal is picked up. This output is transmitted to a frequency-divider 18 through a narrow band pass filter 16 and phase detection 22 is subjected to the carrier wave component signal, and the frequency of the VCO24 is automatically controlled with the phase detected output. A signal frequency-divided to 1/n is phase-shifted 26', and transmitted to a phase detector 28', then an output signal of the converter 12' is synchronously detected by this reproduced carrier signal. |
