How to turn the signals into acceptable trigger pulse is the task of the trigger circuit, which includes trigger source choice circuit, coupling types choice circuit, triggeramplifier and comparator.
触发信号调理电路主要包括触发源选择，耦合类型选择，触发放大器和触发比较器等组成部分。
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Upon reception of a burst detection start trigger signal, a gain control signal is output to an automatic gain control amplifier (201) so as to perform amplification with a maximum value.
The experiment shows that if the current amplifier factor is big, Junction J_3 is hard and the ineffective trigger branch current is low, the turn-on time can be shorten effectively.