| 摘要 |
The invention relates to a voltage supply circuit used in a semiconductor integrated circuit wherein switching between voltages generated is carried out in dependency upon whether the circuit is in an ordinary operating state or in a standby state. This voltage supply circuit includes a first reference voltage generator for supplying a reference voltage through an amplifier circuit to an internal circuit in the operating state, and a power supply voltage converter for supplying a voltage to the internal circuit at least in the standby state, wherein a second reference voltage generator provided independently of the first reference voltage generator becomes operative for a transient time period during which the second reference voltage generator shifts from the standby state to the operating state. By the action of the second reference voltage generator, a setup time at the time of start of the operation is shortened. Further, by allowing the first reference voltage generator to be inactive in the standby state, low power consumption is realized.
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