Voltage Multiplier Block Issue(LTSpice)

Discussion in 'General Electronics Chat' started by ckboii89, Aug 1, 2012.

  1. ckboii89

    Thread Starter New Member

    Aug 1, 2012
    5
    0
    Hi there, sorry if i'm posting in the wrong sub forum.

    I'm building a Voltage multiplier using the LMC6482A Op-amp using diodes and my circuit is giving me issues.

    Based on the formula Vout = -Vtln(Vin/IsR)

    my desired output would like to be -Vth(2/1) = -.018,where Is and R cancel each other out to be 1.

    However, Ltspice is giving me -0.027.....

    my Is value is 1e-14 and resistor value is 1e+14
    Help is greatly appreciated, i'm running around in circles trying to figure out whats going on
     
  2. crutschow

    Expert

    Mar 14, 2008
    13,024
    3,236
    Those current and resistor values are far too extreme for any practical purpose.

    Post you .asc circuit file.
     
  3. ckboii89

    Thread Starter New Member

    Aug 1, 2012
    5
    0
    here is a zip file with the .cir and op amp mod file

    the reason being the current so extreme is because if you open the .mod file in word, the specification of the diode says to use that value?? or maybe im wrong? new to ltspice

    Thanks!
     
  4. crutschow

    Expert

    Mar 14, 2008
    13,024
    3,236
    I don't understand what you are trying to do. :confused:

    If you post the .asc file, I'll take a look at it.
     
  5. ckboii89

    Thread Starter New Member

    Aug 1, 2012
    5
    0
    sorry im not familiar with .asc.... i just changed my file extension from .cir to .asc.. not sure if it will work... i posted a zip file you can download since you need the op-amp for it to work
     
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