Truncate Exponential decay pulse

Well, replace the R with a programmed CCS, tack on a DAC for control.

Tim

-- Deep Fryer: a very philosophical monk. Website:

One good method is to reverse the sign of the time coordinate and use an appropriately-gapped spark plug to cut off the pulse when it gets to the desired voltage. Google for "Zaphod Beeblebrox the fourth".

Failing that, you could do two things:

1. Tell us what the problem you're trying to solve is, and
2. Either make it funny or show that it isn't homework.

Cheers,

Phil Hobbs

Yes ;-)

...Jim Thompson

-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | |

The sign of "t" is a lot harder to reverse than the sign of "R". He could use a -RC. At t=0, he would put a known charge onto C and then wait for the current pulse on the gap.

I need to apply a constant voltage pulse on my resistive load in msec. The time for the pulse varies 0.2-10msec as to my resistive sample loads

-(2000-5000)ohms

-(20-200)ohms

Pls advice