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Low-power CMOS voltage follower using dual differential amplifiers driving high-current constant-voltage push-pull output buffer
Low-power CMOS voltage follower using dual differential amplifiers driving high-current constant-voltage push-pull output buffer
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机译：使用双差分放大器的低功率CMOS电压跟随器，驱动大电流恒压推挽输出缓冲器
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摘要
An amplifier designed from CMOS transistors provides a high current output, despite having a unity-gain configuration. A push-pull output stage drives the output using a p-channel pull-up transistor and an n-channel pull-down transistor. The pull-down transistor's gate is driven by an output from an inverting differential amplifier, that has one differential transistor gate driven by an input voltage and the other driven by the output voltage. A second differential amplifier is configured as a non-inverting differential amplifier, with one differential transistor gate driven by the input voltage and the other driven by the output voltage. The second differential amplifier drives an n-channel gate of an inverting stage, and the output of the inverting stage drives the p-channel pull-up transistor's gate. When the input voltage is above the output voltage, the inverting differential amplifier drives a lower voltage to the gate of the pull-down transistor, reducing sink current, while the inverting stage drives a lower voltage to the gate of the pull-up transistor, increasing source current. Both the pull-up and pull-down transistors work together to raise the output voltage.
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