| 摘要 |
PROBLEM TO BE SOLVED: To provide a differential amplifier that can prevent reduction in a phase margin, realize a circuit configuration that is hardly oscillated, control a gate voltage of an output transistor(TR) without the need for a gate bias power supply circuit for an upper side TR of a loopback cascode current mirror circuit and obtain a rail-to-rail common mode output voltage range with less output on-resistance. SOLUTION: The differential amplifier has a differential input circuit and a loopback cascode current mirror circuit (Q11, Q12, Q13, and Q14) whose gates are all connected receives a current output signal of the differential input circuit so as to control a gate voltage of an output TR (Q22).
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