Mark,
        Investigate the use of MOSFETS with your application.  Low internal
resistance (low losses), high switching speed, and many varieties that
can handle the voltages you speak of.

good luck!
-Pete Cesarz


--------------------------Reply separator-------------------------

Hi all,

Does anyone have experience with using a PIC to switch a high voltage at
high
rates?  I need to switch a variable voltage of 0-200V on and off at
rates of
DC to up to several MHz.  The signal must settle to its final value (+/-
1%)
within 50nSec or less.  Since I need to do this to many different
signals
concurrently, a method requiring minimal high voltage current is best.
I am
especially interested in any high voltage components that can switch
quickly.
 An op-amp capable of 200V+ is ideal.  These are a long list of
requirements
but any help to address any of them is appreciated..........the next
step is
a 400V+ system (oh-no!).

Thanks again.

Mark A. Corio
Rochester MicroSystems, Inc.
200 Buell Road, Suite 9
Rochester, NY  14624
Tel:  (716) 328-5850 --- Fax:  (716) 328-1144
http://www.frontiernet.net/~rmi/

***** Designing Electronics For Research & Industry *****