| 摘要 |
PURPOSE: To eliminate the necessity for an analog circuit for supplying a clock signal to a sampling data filter function by setting up a local oscillator, so that a 2nd frequency is made equal to a value obtained by a 1st frequency by a 3rd fixed element equal to K.N/(K.N±1). CONSTITUTION: The frequency F1 of a reference signal to be supplied by the local oscillator 7 is set up to F10 =K.N.F0 /(K.N±1), based on the frequency division ratio N of a frequency division circuit 10 and a coefficient K determined by the constitution of a filter 9. Thereby two different frequency values F10 , satisfying the foregoing functional condition in each frequency value F0 can be always determined independently of selected K and N values. Consequently, the need for an oscillator for supplying only a clock signal to a sampling data filter is eliminated.
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