| 摘要 |
A transconductance amplifier ( 620 ) includes four transistors each operating in saturation and strong inversion. A first transistor ( 622 ) has a first current electrode and a control electrode both receiving an input voltage, and a second current electrode coupled to a power supply voltage terminal. A second transistor ( 624 ) has a first current electrode, a control electrode coupled to the first current electrode of the first transistor ( 622 ), and a second current electrode coupled to the power supply voltage terminal. A third transistor ( 626 ) has a first current electrode for providing a negative differential current, a control electrode for receiving a bias voltage, and a second current electrode coupled to the first current electrode of the first transistor ( 622 ). A fourth transistor ( 628 ) has a first current electrode for providing a positive differential current, a control electrode for receiving the bias voltage, and a second current electrode coupled to the first current electrode of the second transistor ( 624 ).
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