| 摘要 |
<p>An amplifier assembly comprises a pre-amplifier (002), power amplifier (012) and two distinct loops. The first loop is an arrangement and method of predistorting a modulated carrier in order to compensate for non-linearities present in power amplifier (012). The second loop is a feed-forward loop compensating for residual distortion after the amplified modulated carrier has passed through power amplifier (012). A third loop measures the amplifier system output signal and adjusts loop1 and loop2 to minimise the distortion component at the output of the amplifier system. The amplifier bias and the attenuation of the input signal are adjusted in accordance with a function of the amplifier power input integrated over time depending on the specific heat capacity of the amplifier semiconductor junction and the statistical probability of data occurrence in the modulated carrier input to the amplifier, particularly when the duration of amplifier power output exceeds a predetermined time limit which would induce thermal damage to the amplifier.</p> |
