| 摘要 |
A booster circuit for use in a miniaturized battery operated electronic instrument such as an electronic wristwatch is provided. The booster circuit includes a first capacitor and a second capacitor. A switching circuit is adapted to be disposed in a first operative mode and thereby apply a supply voltage produced by a battery to a first capacitor and thereby charge same to a first voltage. The switching circuit is further adapted to be disposed in a second operative mode to apply the supply voltage and the first voltage stored in the first capacitor in the second capacitor to produce a predetermined output voltage for driving a load substantially equal to the sum of the supply voltage and the first voltage stored in the first capacitor. The booster circuit is characterized by a load detector for producing a load detection signal in response to a change in the load driven by the output voltage. Additionally, an impedance control circuit is coupled to the switching circuit for controlling the impedance of the switching circuit in response to the load detection signal being applied thereto so that the current consumed by the booster circuit is varied in response to the load detection signal.
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