用于个人剂量测量的硅探测器信号处理电路的设计

摘要

介绍了一种用于个人γ剂量测量的微型硅探测器的信号处理电路的设计，讨论了PCB（印制电路板）设计中应注意的问题。该信号处理电路主要包括前置放大电路、滤波成形电路和极－零相消电路，前置放大电路采用了电荷灵敏前置放大器，滤波成形电路采用了CR－RC滤波成形网络。设计的信号处理电路PCB面积仅有10 cm2，对于0．662 MeV的γ射线，信号处理电路的输出信号的信噪比达到了50：1，输出脉冲幅度达到了1．5 V左右，输出信号之后没有明显的下冲现象，其性能可以满足用于个人剂量测量的要求。%Design of signal processing circuit of silicon detector used for γpersonal dosimetry was introduced. Key issues in the designing of the PCB ( printed circuit board) were discussed.The signal processing circuit in-cluded preamplifier circuit, filter and shaping circuit, and pole-zero offsetting circuit.Charge sensitive pre-amplifier was chosen for preamplifier circuit.A CR-RC network was used for filter and shaping circuit.The area of the PCB was only 10cm2 .Forγray with energy of 0.662MeV, the signal-to-noise ratio of the signal processing circuit output achieved 50:1.The amplitude of the output signal achieved about 1.5V.No obvious negative tail was found in the output signals.The requirements of personal dosimetry were achieved by the per-formance of the signal processing circuit.