| 摘要 |
PURPOSE:To reduce the power consumption and to make the chip size small, by applying a bias voltage to two transistors in AC coupling for B-class operation, with a bias circuit independently formed between two power supplies. CONSTITUTION:A constant current Ia flows to a bias circuit 13 with a transistor 15, a bias voltage is fed to the gate of the first transistors 11, 18, currents Ib, Ic flow respectively to a complementary circuit 21 and a wave form shaping circuit 20, resulting that the second transistors 12, 19 are linearly biased. Further, when an AC signal is fed to an input terminal 16 of this circuit, the first transistors 12, 19 are conductive at positive half cycle, and the second transistors 11, 18 are conducted at the negative hald cycle, enabling push-pull B-class operation. |
