| 摘要 |
An oscillating circuit removes a phase difference from between an input signal variable in frequency and a free-running oscillation signal through a two-step voltage-to-frequency control, wherein a frequency comparator, a detector, a flip flop circuit cooperates with a counter so as to vary a control range of the voltage-controlled oscillator in the vicinity of the input frequency, and, thereafter, a phase comparator makes the free-running oscillation signal synchronous with the input signal through the phase comparison therebetween, even if the voltage-to-frequency characteristics of the voltage-controlled oscillator is deviated from a design range, the deviation is taken up through the first-step control so that the manufacturer can delete an external regulator from the oscillating circuit.
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