Stacking MOSFETs

On 7 Mar 2020 08:09:41 -0800, Winfield Hill <winfieldhill@yahoo.com>
wrote:

plastcontrol.ru@gmail.com wrote...

https://pdfslide.net/documents/nanosecond-square-high-voltage-pulse-generator-for-electro-optic-switch.html

That circuit looks good. Nice find!

The secret is the gate capacitors to GND, with zener
protection diodes for the FETs Vgs. If there's no load
for pullup, a high-side switch will also be required.
But it's not clear why the high-side switch can't use
the same trick as the low side, employing only one
isolated gate drive on the bottom FET of the stack.

A brute-force way to do this is to use some commercial (or home-made)
gate driver circuits and float them on each of the fet sources, with
dc/dc converters to power each one. DC/DC bricks with high isolation
and low capacitance are cheap nowadays. Get the signals up there
through an IC isolator or a small transmission-line transformer. Works
for high and low sides.


--

John Larkin Highland Technology, Inc

The cork popped merrily, and Lord Peter rose to his feet.
"Bunter", he said, "I give you a toast. The triumph of Instinct over Reason"