| 摘要 |
PROBLEM TO BE SOLVED: To provide a voltage conversion circuit whose circuit scale and power consumption have been reduced by limiting the variable range of an output voltage close to a desired supply voltage in an internal circuit, and at the same time achieving the accurate variable width in the supply voltage. SOLUTION: The voltage conversion circuit can control the output voltage Vint close to a desired supply voltage by controlling delay time for allowing a delay circuit 102 to delay a pulse signal from a pulse signal generation circuit 101 by a delay time control circuit 103. The voltage conversion circuit is in a configuration where the output pulse signal of the delay circuit 102 is selected from the output signal of a basic delay circuit 107 of the delay circuit 102 and each output signal of an additional delay circuit 108. Therefore, by limiting the variable range of the output voltage close to a desired supply voltage, a control circuit can be simplified.
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