The AVMH family of low jitter, high amplitude impulse generators includes units providing pulse widths in the range of 200 ps to 1 ns, amplitudes from 10 Volts to 100 Volts, and pulse repetition frequencies as high as 25 MHz. Models AVMH-2-C provides 30 Volt impulses. The pulse width is adjustable over a narrow range around 400 ps.