CCVS (current controlled voltage source) in practice - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 22nd November 2014, 10:30 AM   #1
diyAudio Member
 
prasimix's Avatar
 
Join Date: Feb 2009
Default CCVS (current controlled voltage source) in practice

I'm working on a new project where I'll possibly need to deploy a CCVS (Current controlled voltage source). It is transconductance amplifier or converter and many manufacturers offers transconductance amplifier but in form of a VCCS (Voltage controlled current source). In practice I need CCVS with 0.5ohm (or 500mV/A). When using simulation like one in TINA (please see attached image) it's easy: there you can choose ideal CCVS and everything works perfect: for let say 5mA of current it's "mirroring" 2.5mV. I was playing with different current mirror topologies (with 2 to 4 transistors) and the best what I got is predictable "transfer" of 100 ohm, that means for 1mA of the current (Ibias on the picture) 100mV (Vbias). Something that seems to make things more challenging is that emitter is connected to approx. -6V (-15V + 9.1V zener) but this is another story. First I need to get a precise 0.5ohm "mirroring". Many thanks in advance for any suggestion how to proceed.
Attached Images
File Type: jpg PS (IDEAL CCVS).jpg (38.7 KB, 102 views)
  Reply With Quote
Old 22nd November 2014, 05:13 PM   #2
Mr Evil is offline Mr Evil  United Kingdom
diyAudio Member
 
Join Date: Aug 2004
Location: Behind you
You want a transimpedance amplifier - the opposite of a transconductance amplifier. There are many ways you could accomplish this, depending on what you want the voltage for (does it need to be ground referenced? How accurate does it need to be?)

If you want to use a current mirror, the attached schematic shows what immediately springs to mind. It's only approximately 0.5Ω, it's inverting, and it doubles the current through the Zener, but it's simple. You could put it on the other side of the Zener to fix that last issue, but I presume you wanted it in the same place as the CCVS in your schematic.

Another possibility would be to use an op-amp connected as a differential amplifier with the inputs across R13.
Attached Images
File Type: png ccvs.png (2.6 KB, 74 views)
__________________
https://mrevil.asvachin.eu/
  Reply With Quote
Old 22nd November 2014, 11:37 PM   #3
diyAudio Member
 
prasimix's Avatar
 
Join Date: Feb 2009
Thanks for quick response and clarification. Yes, it should be ground referenced and inverting. Precision better then 1%. Measured current do not exceed 15mA.
Suggestion with differential opamp could be at the end the most convenient.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Need a frequency controlled voltage source! LATUBEGEEK Solid State 2 13th March 2013 12:05 PM
Using constant current source as voltage regulator Phisci Power Supplies 10 4th August 2012 07:46 AM
Constant current source for low voltage. digits Construction Tips 5 19th June 2011 10:59 AM
Tube output: Voltage or Current source? Bobby Dipole Tubes / Valves 4 30th October 2010 03:37 AM
voltage/current controlled amplifiers? Spasticteapot Parts 3 8th January 2010 12:59 AM


New To Site? Need Help?

All times are GMT. The time now is 06:26 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2