| 摘要 |
An output buffer for providing an output voltage signal includes an operational amplifier, a controller and a power circuit. The operational amplifier provides the output voltage signal according to an input voltage signal. The controller judges whether a reference signal corresponding to the input voltage signal satisfies an energy-saving condition, and triggers an energy-saving operation event if yes, or triggers a normal operation event if not. The power circuit provides an energy-saving power signal to drive the operational amplifier in response to the energy-saving operation event and provides a normal power signal to drive the operational amplifier in response to the normal operation event, such that the operational amplifier provides the output voltage signal according to the input voltage signal. A voltage level of the normal power signal is higher than a voltage level of the energy-saving power signal.
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