diyAudio

diyAudio (https://www.diyaudio.com/forums/index.php)
-   Solid State (https://www.diyaudio.com/forums/solid-state/)
-   -   Fast and precision current comparator (https://www.diyaudio.com/forums/solid-state/148511-fast-precision-current-comparator.html)

jan.didden 5th August 2009 08:40 PM

Quote:

Originally posted by Wavebourn
Thank you Jan, but I need as less of errors right in the point of comparison, as possible, that's why I decided to use an inverting connection and feed both signals to the same point. Such a way both signals meet the same capacitance, the same non-linearities, the same delay.

True, although you can easily insert both currents into one -input of course. That takes care of that. You can servo out any offset current with a voltage servo to the +input. These circuits look funny but have to be tried to be believed. They really are blindingly fast and challenge your test equipment for speed and accuracy. My error correction power amp has several of them.

jd

Wavebourn 5th August 2009 09:07 PM

Quote:

Originally posted by janneman



True, although you can easily insert both currents into one -input of course. That takes care of that. You can servo out any offset current with a voltage servo to the +input. These circuits look funny but have to be tried to be believed. They really are blindingly fast and challenge your test equipment for speed and accuracy. My error correction power amp has several of them.


Yours have half of a unity gain frequency than what I wanted to use, but 4 times higher slew rate. And they drive 50 Ohm pretty well also.

Thanks, I'll consider them!

jan.didden 6th August 2009 07:13 AM

2 Attachment(s)
I think the SR matters most in your app.
The simplest is like this:


All times are GMT. The time now is 05:08 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 17.65%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio

Wiki