| 摘要 |
FIELD: the invention refers to radio technique particularly to radio communication and may be used in transmitters of television and radio broadcasting, paging and cellular communication. ^ SUBSTANCE: the band power amplifier (fig.1) has an amplifier stage (1), a circuit of feedback, consisting of a directional coupler (2), fulfilled on the two coupled lines, the output of the first of them is connected with the input of a detector (4), a control block (5), switched between the output of the detector (4) and the transistor base (6) whose collector and emitter are connected with a common conductor, and the emitter or the collector of the transistor base (6) forms the output of the feedback circuit switched to the input of the band power amplifier. The second coupled line is switched between the output of the amplifier stage (1) and the output of the band power amplifier. At that the amplifier stage (1) has a transistor (8) whose emitter is connected with the common conductor, an input corrective circuit (9), whose output is connected with a transistor base (8), an additional detector (7) switched between the output of the first coupled circuit and the first input of the control circuit (12), whose second input is connected with the second output of a throttle (11) whose first output is switched to the collector of the transistor (8) and the input of the output matching circuit (10). The output of the control circuit (12) is switched to the transistor base (8). ^ EFFECT: increases amplification factor and coefficient of efficiency. ^ 2 cl, 5 dwg |
