The paper describes a new method for high resolution nuclear timing spectroscopy system using tracking ADCs and free running ramp to give the timing resolution of few ps over wide dynamic range of time interval extending up to few µs. The method makes use of tracking ADCs with 16 bit resolution with low conversion time of nearly 1 µs along with a free running ramp which is given as input to the two ADCs. Both the ADCs and ramp are designed to track their characteristics in order to neutralize the errors due to drift in their characteristics and hence complex system of spectrum stabilization is not required. ADC1 digitizes ramp input at the arrival of START pulse and ADC2 digitizes ramp input at the arrival of STOP pulse. The difference between digital codes of these ADCs is a measure of time interval between START and STOP pulses. New system doesn’t require delay and hence biased amplifier. System has dead time of 1 µs and spectrum stabilization is easy.

中文翻译：

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基于自由运行斜坡和跟踪ADC的新方法的高分辨率核定时光谱系统

本文介绍了一种高分辨率的核定时光谱系统的新方法，该系统使用跟踪ADC和自由运行的斜坡，在扩展到几µs的宽动态范围内提供几ps的定时分辨率。该方法利用跟踪ADC的16位分辨率，近1 µs的低转换时间以及作为两个ADC输入的自由运行斜坡。ADC和斜坡均设计为跟踪其特性，以便抵消由于其特性漂移而引起的误差，因此不需要复杂的频谱稳定系统。ADC1在START脉冲到达时将斜坡输入数字化，ADC2在STOP脉冲到达时将斜坡输入数字化。这些ADC的数字代码之间的差异是START和STOP脉冲之间的时间间隔的量度。新系统不需要延迟，因此不需要放大器。系统的死区时间为1 µs，频谱稳定很容易。