基于LC谐振腔振铃衰减计数的对数ADC伽马/电子能谱仪
A Gamma/Electron Spectrometer with Logarithmic ADC based on LC Tank Ring-Down Oscillation Counting
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中文总结 AI 辅助
本文提出一种基于LC谐振腔振铃衰减计数的对数ADC，利用指数衰减包络实现电荷信号宽动态范围对数压缩，并集成MCU及多种接口，适用于紧凑低功耗的伽马/电子能谱测量。
中文摘要 AI 辅助
本文描述了一种对数模数转换器（ADC）的工作原理、电路实现及数学基础，该转换器利用阻尼LC谐振腔振荡器的自然指数衰减特性。输入电荷脉冲激励调谐LC谐振器进入自由振荡状态。多级高速放大器链对衰减波形进行缓冲，快速比较器对超过可编程阈值的振荡周期数进行计数。由于谐振腔包络呈指数衰减，周期计数与输入电荷的自然对数成正比，从而在无需显式对数电路的情况下，在宽动态范围内实现对数压缩。升级后的单元集成了现代MCU，具备USB、以太网接口及用于采集数据存储的SD卡。该架构非常适合需要紧凑、低功耗实现且具有大动态范围的应用场景。
英文摘要
This paper describes the operating principle, circuit implementation, and mathematical basis of a logarithmic analog-to-digital converter (ADC) that exploits the natural exponential decay of a damped LC tank oscillator. An input charge pulse excites a tuned LC resonator into free oscillation. A multi-stage high-speed amplifier chain buffers the decaying waveform, and a fast comparator counts the number of oscillation cycles that exceed a programmable threshold. Because the tank envelope decays exponentially, the cycle count is proportional to the natural logarithm of the input charge, yielding logarithmic compression over a wide dynamic range without explicit logarithmic circuitry. The upgraded unit incorporates a modern MCU with USB, Ethernet interfaces and SD card for collected data storage. The architecture is well suited to applications requiring large dynamic range in a compact, low-power implementation.
发表机构
- A. I. Alikhanyan National Lab (Yerevan Physics Institute)（阿·伊·阿里哈尼扬国家实验室（耶烈万物理研究所））
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