| 摘要 |
A differential amplifier circuit including a quadritail circuit and a differential pair of transistors. The quadritail circuit has a first pair of first and second MOS transistors, a second pair of third and fourth MOS transistors, and a constant current source for driving the first and second pairs. The differential pair is composed of fifth and sixth MOS transistors and driven by an output current of the quadritail circuit. An input voltage is applied between the gates of the first and second transistors and between the gates of the fifth and sixth transistors. A DC voltage is applied to the common-connected gates of the third and fourth transistors. An output current is derived from an output end of the differential pair. The transconductance linearity of the differential amplifier circuit can be improved.
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