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发明公开
CN104935280A 运算放大器及其驱动电路 有权

运算放大器及其驱动电路
摘要：
本发明提供一种运算放大器及其驱动电路，其中，运算放大器包括输入级电路、输出级电路及定转导电路。输入级电路依据输入电压而提供驱动电压。输出级电路的输入端接收驱动电压，并依据驱动电压以在输出级电路的输出端提供输出电压。定转导电路包括定转导开关电路、电流镜电路及电流镜开关电路。定转导开关电路控制定转导电路的操作。定转导开关电路依据输出级电路所接收的驱动电压，以在驱动电压发生转态时使电流镜电路在转态期间内运作，以对输入级电路提供补偿电流。驱动电压为非转态期间时，电流镜开关电路关闭电流镜电路。
摘要（英）：

The invention provides an operational amplifier and a driving circuit thereof. The operational amplifier includes an input stage circuit, an output stage circuit and a constant-gm circuit is provided. The input stage circuit provides a driving voltage according to an input voltage. Input terminals of the output stage circuit receive the driving voltage, and an output terminal of the output stage circuit provides an output voltage according to the driving voltage. The constant-gm circuit includes a constant-gm switch circuit, a current mirror circuit and a current mirror switch circuit. The constant-gm switch circuit controls the operation of the constant-gm circuit. The constant-gm switch circuit allows the current mirror circuit to operate during a transient time when the driving voltage is transited according to the driving voltage, so as to provide a compensated current for the input stage circuit. When the driving voltage is during a non-transient time, the current mirror switch circuit turns off the current mirror circuit.

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