High voltage fast ramp pulse generation using avalanche transistor

Abstract

The authors have developed an avalanche transistor based pulser for use as a pockel cells driver and for gating a microchannel plate. The output voltage ranges from 1-4 kV to 50 ⍀, with fall times of 200-300 ps. The repetition rate is less than 1 kHz. The trig jitter is less than 100 ps. Trig delay is about 8 ns.

Generating Bipolar nsPulsed Electric Field using Transmission Line & Avalanche Transistors

“…The pulse amplitude at the load, VL, depends on the input voltage divider relationship of Z0 and RL in respects to the transmission lines voltage level, VCC (2). Additionally, the relationship between Z0 and RL determines the reflection coefficient, Γ (3), and therefore the pulse shape across RL (3).…”

“…There are numerous methods of generating high amplitude, nsPEFs with a rise and fall time of 2 ns. Traditionally, coaxial transmission line-based implementations, such as Blumlein, in correlation with spark gap, Marx bank, or diode and laser opening switch techniques have been used to generate highvoltage nsPEFs [1]- [2], [5]- [7]. Traditional methods have been known to be costly and have their flaws.…”

High frequency nanosecond pulse generator for CuBr-laser pumping

“…The duration of the excitation pulse was in the range of 40-150 ns (half-width). The literature review shows that it is possible to obtain pumping pulses of short duration using pulse circuits on avalanche transistors as a master oscillator [8][9][10][11][12]. There are a great number of variations of the circuits based on avalanche transistors for producing high-frequency nanosecond pulses.…”

Generation of ultrawideband picosecond impulses with fast fall‐time

“…Semiconductor devices with different physics of fast switching, such as tunnel diodes , step recovery diodes (SRDs) , bipolar transistors , and avalanche transistors are commonly used as pulse sharpeners. Avalanche transistors can generate high power, but the pulse repetition rate is limited in the kHz range only.…”