Multiple Aperture Window Discriminator

Discussion in 'The Projects Forum' started by Mazaag, Nov 6, 2007.

  1. Mazaag

    Thread Starter Senior Member

    Oct 23, 2004
    Hi guys,

    I'm looking at the MAWD on the 3rd page of this link :

    could somoene explain how this works ?

    I understand that they are a bunch of comparators, but can someone explain the FETs ?

    hers's what i understand,

    once the first op-amp (V4 and Vin) goes HIGH ( ie: Vin > V4 ) , the fet is conducting, therefore, Vin appears at the positive terminal beign compared to V3 .... doesn't that mean that the output from the second opamp goes HIGH when the first condition is satisfied ( Vin > V4 ) AND Vin > V3 ?

    Thanks guys

    My apologizes this should have been posted in the General Electronics section
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    If the compared voltages are each higher as you go down the chain, then the comparators work. If V4 is 1 volt, V3 is 2 and V2 is 3, presenting 2.5 volts at Vin will result in the top two comparators high and the bottom 2 low, meaning the input is between 2 and 3 volts.