| 摘要 |
PURPOSE:To prevent the effect on the output due to external disturbance and to reduce the distortion factor of the amplifying circuit, by feeding the signals of opposite phase each other of the differential amplifying circuit to two positive or inverting phase amplifying circuits. CONSTITUTION:The signal of opposite phase is fed to the input signal IN formed with the differential amplifying circuit 3 to the input of the positive phase amplifiers 1 and 2, the output is inverted phase signal each other, and BTL (Balanced Transformer Less) circuit is constituted. Accordingly, since the output signal operates so that the component of distortion is cancelled each other, the distortion factor can be decreased. Further, since the BTL amplifying circuit outputs the difference voltage between the circuits 1 and 2, the effect on the output signal due to external disturbance such as power input variation (including ripple) is indicated as the in- phase signal, then the output signal does not contain by cancellation and the output distortion can be reduced. |
