微带型光导开关的电压转换效率

采用微带测试电路对光导开关电压转换效率进行了测试。依据传输线理论,考虑微带传输电路的端点反射,计算给出了光导开关导通电阻不为0的情况下,微带测试电路电压转换效率的解析结果。计算表明:对窄脉宽的线性电脉冲输出,电压转换效率将小于50%;对lock-on模式下的宽脉冲输出,电压转换效率可以超过50%,在理想情况下达到100%;在临界状态下,形成双峰电脉冲输出。结果表明,存在端点反射且光导开关产生电脉冲脉宽达到一定值时,微带线可以起到倍压传输线的作用。

Voltage conversion ratio of photoconductive semiconductor switch in microstrip test circuit

The voltage conversion ratio of the photoconductive semiconductor switch (PCSS) is measured in the microstrip test circuit. The analytical equation of the ratio is deduced according to transmission line theory with the consideration of reflection from the source end and non-zero on-state resistances of PCSS. Calculations show that, when the PCSS is operated in linear mode, the voltage conversion ratio is always less than 50%; when the PCSS is operated in lock-on nonlinear mode, the ratio can be more than 50%, and reach 100% in ideal case; the output electrical pulse includes two peak voltages when the PCSS is operated in the critical case between the above two modes. The theoretical computation is in good agreement with the measured data within the error limitation. It is found that the mi