Mr. Jincheng Shi Profile

Jincheng Shi

at Xi'an Institute of Optics and Precision Mechanics

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Proceedings Article | 15 October 2015 Paper

The design of nanosecond high-voltage ultra wide band bipolar pulse generator

Jincheng Shi, Baiyu Liu, Yongsheng Gou

Proceedings Volume 9674, 967427 (2015) https://doi.org/10.1117/12.2199899

KEYWORDS: Digital filtering, Pulse generators, Avalanche photodiodes, Transistors, Resistance, Picosecond phenomena, Analytical research, Gaussian pulse, Capacitance, Inductance

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The design of nanosecond high-voltage ultra wide band bipolar pulse generator is shown in this paper. By analyzing the principle of the avalanche diode and doing the research of the related circuit acting on the pulse, this generator can generate a nanosecond high-voltage ultra wide band bipolar pulse, which its peak-to-peak voltage is about 400V and the pulse time width is 2ns. The experimental results showed a good agreement with the simulation results. A negative unipolar high-voltage pulse, having a fast falling-edge and a slowly exponential rising-edge, was firstly generated by the MARX circuit consist of the avalanche diodes. Then the use of the high speed avalanche diode could generate a negative unipolar high-voltage narrow Gaussian pulse, having a fast falling-edge and a fast rising-edge. In an attempt to cancel the reflection of the pulse made by the impedance mismatch, the circuit introduced the capacitor(C) and inductor(L) by calculating. Eventually a nanosecond high-voltage ultra wide band bipolar pulse could be got after going through the differentiator consist of introducing the right resistance, capacitance and inductance by calculation and experiment, and a filter with 2GHz bandwidth makes the bipolar smooth and perfect.

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