| 摘要 |
<p>Disclosed here is a power supply control circuit responsive to a control signal for intermittently supplying a battery voltage to a frequency synthesizer so as to restrain the exhaustion of the built-in battery. In order that the charge of the capacitor of an active LPF, inserted between the built-in battery and the frequency synthesizer to constitute this power supply control circuit, may not be released toward the synthesizer side during the suspended period of voltage supply to the synthesizer, switching means responsive to said control signal is added. This power supply control circuit can advance the rise of the supply voltage, and accordingly the stabilization of the output frequency of the synthesizer, when said voltage supply is resumed. <IMAGE></p> |
