| 摘要 |
PURPOSE:To obtain a stable and optional output frequency by providing a variable frequency divider and a variable multiplier between a reference frequency oscillator of a synthesizer and a phase comparator, making a reference frequency variable optionally, and also bringing it to an interlock control with the variable frequency divider. CONSTITUTION:A reference frequency signal which has been obtained by frequency-dividing an output of a reference frequency oscillator 3 by a 1/0 variable frequency divider 7, and thereafter, multiplying it by N by a variable N multiplier 8, and a signal which has been obtained by frequency-dividing an output of a voltage control oscillator are brought to a phase comparison, by which an error signal is obtained, and the signal concerned is filtered and fed back to the oscillator 1, and also the frequency dividing number and the multiplying number of the frequency divider 7, the multiplier 8 and a frequency divider 2 are brought to an interlock control by a frequency division and multiplication controlling circuit 9. In this way, an output of an optional frequency can be oscillated without lowering the loop gain.
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