| 摘要 |
A differential amplifier circuit of the present invention comprises an input circuit 10 for producing a difference voltage signal between a positive input signal and a negative input signal, a feedback bias circuit 20 for inputting the difference voltage signal supplied from the input circuit 10 to provide a bias voltage corresponding to the difference voltage signal and for performing a feedback control on the bias voltage by feeding back an output current, an output circuit 30 for supplying a load with the output current corresponding to the bias voltage, and a current detection circuit 40 for detecting the output current to provide it to the feedback bias circuit 20. The differential amplifier circuit performs class-AB amplification in such a way that the bias voltage provides a current value close to zero when the difference voltage signal is substantially zero. <IMAGE> |
