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信号堆积会使信号的基线发生涨落,即使无尾堆积的脉冲通过CR网络时,由于电容在放电时间内不能把电荷量充分释放,下一个脉冲到达时剩余电荷会引起新脉冲基线偏移。有CD型、CDD型、开关型和门控型四种。

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静态时,各点电位为0电位 ;有如图所示正脉冲输入时,V2电压升高D1截止,D2导通,V1为0电位,V3与V2相同 ;输入信号过了峰值后,V2电压低于V3电压,D2截止,此时A作为比较器,A的同相端电压低于反相端,V2为负电压,D1导通,V1为负电压,D2截止,V3为峰值电压 ;门控信号过来后,开关S闭合,电容电荷量快速释放,V3降低,直到0电位,此时恢复至初始状态。

根据探测器输出信号成形方式的特点分类,前置放大器可以分为(( ))( )(( )) 、(( ))( )(( ))(()( )((__ ))。

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