| 摘要 |
<p>In order to improve the distortion performance of a feed forward corrected amplifier an amplifier arrangement includes a distortion generator (312), intermediate the input (15) and the main amplifier (1). The arrangement is such that the input signal passes to the distortion generator (312) via a coupler (307). The signal passes via a delay network (310) which compensates for the delay of distortion network (312) and is tapped by a coupler (308) to be combined by a coupler (313) with the distorted signal from the distortion generator (312). In this way the output of the distortion generator is subtracted from a sample of the input signal so that only the distortion remains to pass via phase and amplitude correction networks respectively (314 and 315) to be amplified by a gain element (316) before being coupled back into the main signal path by a coupler (309). The correction is active over a portion of the amplifier characteristic only, being the compression region of the amplifier. Hence the amplifier compression point may be raised. Raising the compression point increases the overall power handling capability of the amplifier by increasing the level at which the overall arrangement will saturate to cause distortion.</p> |
