| 摘要 |
According to one embodiment, a constant voltage power circuit includes a bias generator, a reference voltage generator, and a constant voltage generator, a bias switch, a constant voltage controller. The bias generator generates a first bias voltage. The reference voltage generator is connected to the bias generator and generates a reference voltage. The constant voltage generator generates a constant voltage. The bias switch switches a bias supplied to the constant voltage generator in accordance with a switch control signal controlling the bias switch. The constant voltage controller obtains a detected voltage corresponding to the constant voltage or a power supply voltage, and generates a constant voltage control signal and the switch control signal. The constant voltage control signal sets an operating state of the constant voltage generator to an enable state or a disable state.
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