Measurement of nanosecond-scaled reverse recovery time by a CPU-based instrument
Measurement of nanosecond-scaled reverse recovery time by a CPU-based instrument
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基于CPU的仪器测量纳秒级反向恢复时间
DOI：
10.1016/j.measurement.2021.110371
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发表时间：
2021
期刊：
影响因子：
5.6
通讯作者：
Senrong Dai
中科院分区：
文献类型：
--
作者：
Wensheng Wei;Yueda Mo;Shouhao Yu;Xiaoling Yang;Wenxi Huang;Senrong Dai
动态特性是半导体开关器件最重要的性能。本文设计了一种基于 CPU 的仪器，用于测量低功率开关二极管的反向恢复 (RR) 时间 (Trr) 和 RR 电荷 (Qrr)。在设计的电气系统中，反向电压脉冲由由微波晶体管构成的发射极耦合逻辑 (ECL) 电路整形，以提高脉冲边缘的换向速率，将其应用于被测器件以产生 RR 电流 (Irr) 波形。该波形由采样电路中另一个ECL组成的电压比较器转换为宽度等于RR时间的电压脉冲。该采样脉冲被发送到模数转换器，随后进入89C2052型CPU计算Trrand Qrr的值，并由液晶显示器监视。所展示的 Triris 最低计量范围约为 3 ns，显示的 Trr 值与示波器观察到的一致，验证了设计。此外，ECL的应用表明了一种高速信号处理的手段。
The dynamic characteristics imply the most important performance of semiconductor switching devices. Herein, a CPU-based instrument is designed for measuring the reverse recovery (RR) time (Trr) and RR charge (Qrr) of low power switching diodes. In the designed electrical system, the reverse voltage pulse is shaped by an emitter coupled logic (ECL) circuit constructed with microwave transistors to raise the pulse edges’ commutating-rate, which is applied to the device under test to yield the RR current (Irr) waveform. This waveform is converted into a voltage pulse with width equal to the RR time by voltage comparator consisted of the other ECL in the sampling circuit. This sampled pulse is sent to analog–digital converter and subsequently into an 89C2052-type CPU for calculating the values of Trrand Qrr, they are monitored by a liquid crystal displayer. The lowest metering range of about 3 ns of Trris demonstrated, the displayedTrrvalue agrees with the one observed by oscilloscope, which verifies the design. Besides, the application of the ECL indicates a means of high-speed signal processing.