Circuit simulation of double-exponent pulse current generator

Double-exponent pulse current generator can be used in conducted coupling experiment of electronic system ports. The generator can produce a double-exponent pulse current of rise-time 10 ns, pulse width 100 ns and current amplitude 3 kA. In this article, a circuit model of generator is established. Influence of stray capacitor and inductance on pulse current is analyzed and a possible optimizing scheme is also mentioned. Results of simulation show that stray capacitor at load can cause overshoot on the current waveform. At the same time, stray capacitor and inductance at current measurement zone can also cause oscillating interferential wave on the falling edge of current waveform. There are two possible methods to restrain the overshoot and interference. One is that a filter should be fitted at the current measurement zone. The other is that a lossless coaxial cable with proper impedance should be used to transmit the current.