High-speed time-gated Single Photon Avalanche Photodiode (SPAD) allows faster detector response times and low afterpulsing effect. Due to the intrinsic capacitance of the SPAD, a fraction of the gate signal is coupled to the readout node. This is unwanted signal and needs to be suppressed. This paper presents a technique to recover the tiny avalanche signal, compensating the high-speed gate feedthrough. The cancellation is carried out in the same way as in the destructive scheme. However, the interfering signal was generated by combining two similar but out-of-phase sinusoidal signals. The proposed scheme is performed using a Micro Photon Devices (MPD) InGaAS/InP SPAD and a Printed Circuit Board (PCB) circuit that has been implemented for this purpose. Tests and measurements were conducted when applying 59.4 V fixed DC supply and 5 $\text{V}_{pp}~1.72$ GHz sinusoidal gating signal. The detector was cooled to 223.15 K, corresponding to 60.4 V breakdown voltage. Applying attenuated laser pulses at 1550 nm, a quantum efficiency of 16% has been measured. The developed technique allowed to suppress the SPAD capacitive response up to 50 dB. In addition, the scheme has provided a better avalanche signal quality compared to a similar circuit employing a low-pass filter to suppress the gate frequency.

中文翻译：

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正弦波门控高速单光子雪崩光电二极管探测器的电容响应信号消除


高速时间选通单光子雪崩光电二极管 (SPAD) 可实现更快的探测器响应时间和较低的后脉冲效应。由于 SPAD 的固有电容，一部分栅极信号耦合到读出节点。这是不需要的信号，需要抑制。本文提出了一种恢复微小雪崩信号、补偿高速栅极馈通的技术。取消的执行方式与破坏性方案相同。然而，干扰信号是通过组合两个相似但异相的正弦信号而产生的。所提出的方案是使用 Micro Photon Devices (MPD) InGaAS/InP SPAD 和为此目的实施的印刷电路板 (PCB) 电路来执行的。测试和测量是在施加 59.4 V 固定直流电源和 5 $\text{V}_{pp}~1.72$ GHz 正弦选通信号时进行的。探测器冷却至 223.15 K，对应于 60.4 V 击穿电压。应用 1550 nm 的衰减激光脉冲，测得量子效率为 16%。所开发的技术可将 SPAD 电容响应抑制高达 50 dB。此外，与采用低通滤波器抑制栅极频率的类似电路相比，该方案提供了更好的雪崩信号质量。