Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

I want to design a diode circuit

  1. Mar 24, 2013 #1
    i want to design a diode circuit where the Vo vs. Vi looks like this:

    Vi between -2 and 2 Vo = Vi

    Vi between 2 and 4 Vo is a linear with slope 0.5
    Vi between -2 and -4 Vo is a linear with slope 0.5

    Vi>4 Vo=3
    Vi<4 Vo=-3

    how can i do this?
    Last edited: Mar 24, 2013
  2. jcsd
  3. Mar 24, 2013 #2


    User Avatar
    2017 Award

    Staff: Mentor

    Just with diodes? Are you sure this is possible?

    With a lot of transistors and resistors? That is possible, but it could look messy.
  4. Mar 24, 2013 #3
    you can use diodes, voltage sources, and resistors.
    i don't know how to get Vo=3 if Vi=4 and Vo=-3 if Vi=4 in one circuit!
  5. Mar 24, 2013 #4


    User Avatar
    Science Advisor
    Gold Member
    2017 Award

    This takes me back to generating arbitrary laws with 'piecewise linear' circuits using zener diodes and resistors. I googled the term and saw this link, which does the sort of thing I think you are after. (about half way through the slide show). Google the same term and you should get some other suggestions.
    You'd have to work out the resistors for yourself but you should be able to solve the problem that way.
  6. Mar 24, 2013 #5
    That's exactly what i was looking for! Thank you!
    I solved it without zener, but used diode and a voltage source instead, hopefully it's correct!
    Thanks again!
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: I want to design a diode circuit
  1. Diode circuit (Replies: 2)