Baseline holder (BLH) circuits are used widely to stabilize the analog output of application-specific integrated circuits (ASICs) for high-count-rate applications. The careful design of BLH circuits is vital to the overall stability of the analog-signal-processing chain in ASICs. Recently, we observed self-triggered fluctuations in an ASIC in which the shaping circuits have a BLH circuit in the feedback loop. In fact, further investigations showed that methods of enhancing small-signal stabilities cause an even worse situation. To resolve this problem, we used large-signal analyses to study the circuit's stability. We found that a relatively small gain for the error amplifier and a small current in the non-linear stage of the BLH are required to enhance stability in large-signal analysis, which will compromise the properties of the BLH. These findings were verified by SPICE simulations. In this paper, we present our detailed analysis of the BLH circuits, and propose an improved version of them that have only minimal self-triggered fluctuations. We summarize the design considerations both for the stability and the properties of the BLH circuits.

中文翻译：

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辐射探测器读出电路中基线保持器的稳定性

基线保持器 (BLH) 电路广泛用于稳定高计数率应用的专用集成电路 (ASIC) 的模拟输出。BLH 电路的精心设计对于 ASIC 中模拟信号处理链的整体稳定性至关重要。最近，我们在 ASIC 中观察到自触发波动，其中整形电路在反馈回路中有一个 BLH 电路。事实上，进一步的调查表明，增强小信号稳定性的方法会导致更糟的情况。为了解决这个问题，我们使用大信号分析来研究电路的稳定性。我们发现误差放大器需要相对较小的增益和 BLH 非线性阶段的小电流来增强大信号分析的稳定性，这会损害 BLH 的特性。SPICE 模拟验证了这些发现。在本文中，我们对 BLH 电路进行了详细分析，并提出了它们的改进版本，该版本只有最小的自触发波动。我们总结了 BLH 电路稳定性和特性的设计注意事项。