| 摘要 |
PCT No. PCT/GB95/02409 Sec. 371 Date Jul. 19, 1996 Sec. 102(e) Date Jul. 19, 1996 PCT Filed Oct. 12, 1995 PCT Pub. No. WO96/12343 PCT Pub. Date Apr. 25, 1996A multi-channel transmitter has a variable gain preamplifier (8a, 8b, 8c) for each channel, the combined outputs being fed to a linearized multi-channel power amplifier (10). The output of the latter is sampled by coupling means (12) which produce a sampled signal representative of the power in each channel. The sampled signal is applied to a frequency selective feedback loop which, for each channel, provides a control signal (20a, 20b, 20c) applied to the corresponding preamplifier (8a, 8b, 8c) to vary the gain of the latter in order to provide separate power control for each channel. |
