| 摘要 |
<p>PURPOSE:To output a stable timing signal by decreasing the gain of a limiter amplifier when an input level of the amplifier is lowered out of a specified range so as to prevent the oscillation stability from being deteriorated because of the decrease in the input level. CONSTITUTION:An output of a waveform shaping circuit 5 built in a regenerative repeater is inputted to a band-pass filter 3 and an identification regenerating circuit 6. The output of said filter 3 is fed to a limiter amplifier 4 and inputted to a gain control circuit 8. When the input level of the amplifier 4 is lowered below than the specified range, the output of the control circuit 8 controls the gain of the amplifier 4 so as to decrease the output of the amplifier 4 and the result is fed to the identification regenerating circuit 6. Thus, the oscillation stability is prevented from being deteriorated because of the input level decrease and a stable timing signal is outputted.</p> |
