| 摘要 |
The compensation range of feed-forward amplifiers is expanded. The circuit includes a main amplifier (4). Part of the output of the main amplifier is combined (7,8) with a branched (2) part of the input signals and applied to an auxiliary amplifier (15) through a vector adjuster (13). The peak value of the input or output of the auxiliary amplifier (15) is detected with a peak power measurer (24), and the characteristic of a distortion detecting loop (100) is controlled with a vector adjuster (3) and a control circuit (9) so as to minimize this peak value. By controlling the characteristic of the distortion detecting loop by detecting the peak value, the range of linearity compensation is expanded compared with conventional control based on the average level. The output of the auxiliary amplifier is combined (12) with the output of the main amplifier to provide the circuit output. The main amplifier output is also applied through a level detector (24) and a control circuit (14) to control the other vector adjuster (13). A pilot signal is inserted into the input signal, which is detected by the level detector. <MATH> |
