1/x function with op-amp?

Discussion in 'The Projects Forum' started by Solarelf, Nov 2, 2014.

Thread Status:
Not open for further replies.
  1. Solarelf

    Thread Starter New Member

    Oct 30, 2014
    21
    0
    hej guys,
    I am puzzled with a problem which appeared simple on the first glance, but now after hours and hours of experimenting with simulator I am totally lost...
    My challenge is:
    - I have a function as voltage fed into op-amp
    - I am asked to build a circuit with as few op-amps as possible to get 1/f(x)
    T.ex.: y=x (input) -> y=1/x (output)
    Any suggestions?
     
  2. kubeek

    AAC Fanatic!

    Sep 20, 2005
    4,670
    804
    google logarithmic and antilogarithmic amplifier.
     
  3. Solarelf

    Thread Starter New Member

    Oct 30, 2014
    21
    0
    Already did... and even simulated several circuits candidates.... in theory, LOG -> Inverse -> Antilog should do the trick.... first two works just fine, but after the last transformation I get something very poorly looking like 1/x :) After talking to my tutor I was surprised to know this is possible to do with 1 LOG and one (and only one!) additional op-amp! But he never tells the whole picture!
     
  4. MrChips

    Moderator

    Oct 2, 2009
    12,446
    3,362
Loading...
Thread Status:
Not open for further replies.