超宽带皮秒级脉冲发生器

设计了一种超宽带高斯脉冲的脉冲发生器，此脉冲发生器主要由阶跃恢复二极管，FET管和肖特基二极管组成。其中阶跃恢复二极管和短路线用来产生脉冲，FET管用来进行脉冲的放大和脉冲产生、脉冲整形两部分电路间的隔离，肖特基二极管用来减小脉冲的振铃。利用ADS软件对阶跃恢复二极管进行建模，并用其进行脉冲发生器的设计仿真。测试结果表明，皮秒脉冲发生器的脉冲宽度为307 ps，幅度为1.88 V．该窄脉冲的波形对称，而且振铃小，实验结果与仿真结果吻合得很好。

Ultra-wideband Subnanosecond Pulse Generator

A new ultra-wideband( UWB) Gaussian pulse generator composed of a step recovery diode (SRD)，a field-effect transistor (FET) and a Schottky diode was developed. A SRD and a short-cir?cuited transmission line are used to generate Gaussian pulse directly, a FE! is employed to amplify the pulse and isolate pulse generation and shaping network, a Schottky diode is used to suppress the pulse ringing. A SRD model, which is used to simulate the pulse generator, was established by an existing radiofrequency software ADS, and the pulse generator was designed and simulated by the model. The testing result shows that the generator can produce a 307 ps Gaussian pulse with 1.88 V peak-to-peak; the pulse has good symmetry and low ringing level. Good agreement between measured and simulated results was achieved.