| 摘要 |
PURPOSE:To decrease the power consumption and to reduce a circuit scale by switching a switch in time division so as to reduce the number of prescalers. CONSTITUTION:A pulse P11 is inputted to the 1st control input terminal 21 during time t1, the 1st level holder 19 is turned on, no pulse is inputted to the 2nd control input terminal 22 and the 2nd level holder 20 is turned off. A program signal P31 is inputted to a program data input terminal 25, the 1st programmable divider 8 is set to a specified comparison frequency, a switch control signal P41 is inputted to a switch control input terminal 24 and when a switch 23 is connected to the 1st voltage controlled oscillator 6, the output signal of a local oscillation frequency f1 is outputted from the 1st output terminal 7, then the output signal in the frequency f1 is inputted to the 1st prescaler 9 via the switch 23. Thus, the 1st prescaler 9 divides the frequency up to the frequency handled by the divider 8 to output the 2nd frequency division signal.
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