| 摘要 |
PURPOSE:To decrease the output voltage distortion factor of an output terminal by providing the 1st amplifier controlling an output voltage of the outputterminal and the 2nd amplifier supplying a current to a load, improving the linearity of an output stage so as to apply stable negative feedback up to a high frequency. CONSTITUTION:Four impedance circuits 5-8 are connected in a bridge, and the connecting point between the 1st impedance circuit 5 and the 2nd impedance circuit 6 is connected to an output terminal of the 1st amplifier 3 and a non- inverting input terminal of the 2nd amplifier. Further, the connecting pint between the 1st impedance circuit 5 and the 3rd impedance circuit 7 is connected to the output terminal of the 2nd amplifier 4, the connecting point between the 3rd impedance circuit 7 and the 4th impedance circuit 8 is connected to an inverting input terminal of the 2nd amplifier 4, the connecting point between the 2nd impedance circuit 6 and the 4th impedance circuit 8 is used as the entire output terminal and connected to a non-inverting input terminal of the 1st amplifier 3 via a negative feedback circuit 9. Then, the entire input terminal is used as the non-inverting input terminal of the 1st amplifier 3.
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