| 摘要 |
A differential amplifier comprises: first and second transistors the emitters of which are connected to each other through a resistance element; a third transistor to the emitter of which a current equal to the collector current of the first transistor is applied; and a fourth transistor to the emitter of which a current equal to the collector current of the second transistor is applied. Signals provided at the emitters of the third and fourth transistors, after being level-shifted, are supplied to the bases of the second and first transistors, respectively. Thereby, a differential amplifier which is linear in transfer characteristic and large in input dynamic range is obtained.
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