Patent ID: 7834596

Claim:
An analog power-saving apparatus for sharing electric charges, comprising: a digital-to-analog converter, for producing an analog voltage according to a digital signal; an operational amplifier, comprising a first input terminal for receiving the analog voltage and a second input terminal coupled to an output terminal of the operational amplifier; a load capacitor, comprising a first terminal coupled to the output terminal of the operational amplifier for outputting an output voltage and a second terminal coupled to a reference level; an energy-storing unit, comprising a first terminal for outputting a sharing voltage and a second terminal coupled to the reference level; and a control module, coupled to the output terminal of the operational amplifier and the first terminals of the energy-storing unit and the load capacitor for receiving a comparison signal produced by the output terminal of the operational amplifier and thereby controlling electric charges-sharing states between the load capacitor and the energy-storing unit, wherein the control module controls the electric charges-sharing states between the load capacitor and the control module in analog mode, during a duration when the energy-storing unit needs to distribute stored electric charges thereof to the load capacitor and electric charges stored in the energy-storing unit are less than electric charges stored in the load capacitor, the control module keeps the energy-storing unit from distributing electric charges to the load capacitor, and after the load capacitor discharges electric charges thereof to the energy-storing unit for storage, the control module controls an amount of electric charges of the load capacitor after discharge to be not less than an amount of electric charges stored in the energy-storing unit after storage.