| 摘要 |
PURPOSE:To reduce power consumption by supplying PLL intermittently independently of the operating state such as standby or talking time of a radio equipment, and varying properly the on/off timing of the feeding depending on the operating state, thereby prolonging the off-period as longer as possible. CONSTITUTION:An output of a voltage controlled oscillator(VCO) 7 is inputted to a variable frequency divider 11 and inputted to one terminal of a phase comparator 3 while being frequency-divided into a designated frequency division ratio designated by a channel setting device 12. An output of a phase comparator 3 is converted into an analog signal by a charge pump 4 and becomes a control voltage of the VCO 7 via a switch 5 and a loop filter 6. Moreover, the switch 5 and the power supply 10 are subject to on/off control by an on/off control section 9 to turn on or off the PLL circuit. Thus, intermittent operation is implemented independently of the operating state of a radio equipment and the PLL circuit is turned on during channel switching operation, then considerable low power consumption is attained. |
