| 摘要 |
PROBLEM TO BE SOLVED: To provide a voltage supply circuit and a circuit device capable of shortening a period of time required for the start and end of the operation of a circuit while reducing noise caused in the output of the circuit in the case of turning on or off the power source of the circuit. SOLUTION: In the case of starting or stopping power supply to a signal processing part 10, a reference voltage Vref to be supplied to the signal processing part 10 is continuously changed, and a noise with a high frequency to be generated in the output of the signal processing part 10 is reduced. Also, the set value of the waveform of the reference voltage Vref is generated by digital signal processing in a voltage setting part 30 so that it is possible to generate desired waveform without receiving the constraint of the value of the circuit element or circuit configurations. Therefore, it is possible to shorten the changing time of the reference voltage Vref while reducing the output noise of the signal processing part 10. COPYRIGHT: (C)2008,JPO&INPIT
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