| 摘要 |
PURPOSE:To increase the reliability for the titled circuit, by delivering a high frequency input signal (a) of an excessive level in the form of a signal (b) having a delayed rise time point via a delay control means to produce an output after a prescribed time, a variable impedance elements, etc. CONSTITUTION:When an RF signal (a) of an excessive level is supplied to an input terminal 1, this signal emerges at an output terminal C of a lambda/4 hybrid 3 and the positive voltage is supplied to a transistor TR6 via an integrating circuit consisting of elements 14 and 16 after the wave detection. The TR6 is cut off until the time T produced by the time constant of the integrating circuit elapses, and a TR7 and a diode 5 conduct. Thus the signal (a) is distributed to output terminals C and D and absorbed to the matched loads 8, 9, etc. not to emerge at an absorbing terminal B. When the time T elapses, the diode 5 is cut off with the terminal D released from the earth. Thus the signal (b) is distributed to the terminals D and B to be delivered to a terminal 2. In such a way, only the excessively level part is suppressed for the input signal to prevent an excessive excitation for the element of the final stage part. |
