| 摘要 |
PURPOSE:To make it possible to use both FDMA and TDMA signals for repeating amplification in common and then to make use of that effectively for a satellite repeater, etc., by providing a delay circuit whose delay time agrees with the time when a gain control signal and input signal arrive at a variable gain amplifier. CONSTITUTION:A signal branched 7 partially is level-detected and amplified 11 and then applied to input terminal C of variable gain amplifier 9 as gain control signal Sc. Input signal Sin, on the other hand, is applied to amplifier 9 via delay circuit 8 and delay time (gamma) of circuit 8 is determined so that the time when the gain of amplifier 9 has been controlled will be equalized by signal Sc to when signal Sin reaches amplifier 9. As a result, the gain can be varied according to the input signal level without time delay, so that a constant output can be obtained without reference to the speed of the input signal level. Further, there is the advantage to use it for both FDMA and TSMA signals. |
