| 摘要 |
The power amplifying circuit embodied by the invention is composed of a single-unit circuit capable of varying own bias condition, and yet, more than two kinds of amplifying modes can selectively be activated merely by applying a single-unit power amplifying circuit. Concretely, the power amplifying circuit embodied by the invention comprises the following, a power amplifying transistor, a base-side transmission line, a resistance element connected to the base-side transmission line, the first switching element accommodating current path formed in series against the resistance element so that the first potential can be delivered to the resistance element, the second switching element which is inserted between the base-side transmission line and the second potential, and a circuit means for varying the value of a base potential of the power amplifying transistor by means of opposite switching operations performed by the first and second switching elements.
|
