| 摘要 |
Disclosed is a a wide band frequency amplifier comprising the following: A first and a second transistor constitute a first push-pull amplifier circuit. A first current source is included, of which one end is connected to the second transistor base, the other end connected to ground. A first bias voltage source is interposed between the bases of the first and the second transistors. A third transistor is coupled with the first transistor in Darlington connection, thereby driving the first and the second transistors using an input signal. A fourth and a fifth transistor constitute a second push-pull amplifier circuit. A second current source is provided, of which one end is connected to the fourth transistor base, the other end connected to ground. A second bias voltage source is interposed between the bases of the fourth and the fifth transistors. A sixth transistor is coupled with the fourth transistor in Darlington connection, thereby driving the fourth and the fifth transistors using the input signal. A phase element is interposed between the second transistor base and the output end of the second push-pull amplifier circuit, thus causing the second and the fifth transistors to operate in Darlington connection at a trailing edge of the input signal.
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