基于双端口RAM的高速伽玛脉冲幅度分析电路设计

The Design of High Speed gamma Pulses Height Analysis Circuit

在伽玛能谱测井中,减小死时间是在单位时间内提高伽玛脉冲计数统计精度的有效途径之一,论本文从系统角度提出了提高测井数据采集速度的基于双端口RAM加双CPU结构的方案设计,包括线性放大、成形、采集保持、A/D转换以及数据存储等,使能谱数据吞吐率达到333 k/s;同时指出影响能谱线性的因素及应注意的问题。

Reducing dead time as small as possible is one of the most effective methods of improving statistical accuracy of gamma pluses count.Based on the above assumption,the paper proposed the circuit configuration of dual port RAM plus double microprocessors,one microprocessor,including comparator,sample and hold,AD convertor,capacitor leakage and latch,perform high speed acquisition and put into dual port RAM,in the mean time,another microprocessor read spectrum data from the dual port RAM in counterpart side.As a result,a throughput rate of 333 k/s is achieved.The paper also proposed the measures to reduce non-linearity of N451.