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Linear Combination OP Amp Design

Discussion in 'Electronics Homework Help' started by TBarlow, Jun 20, 2015.

  1. TBarlow

    TBarlow

    1
    0
    Jun 20, 2015
    So, I have about 8 questions along the same lines as this, and what I am looking for is any kind of formula's to assist in how to figure this problem. The problem is as follows:

    Design a linear combination circuit to combine three signals as follows:

    Vo = -2v(sub)1 - 8v(s)2 - v(s)3

    The following specifications are imposed:
    a. Rin (Greater or equal to) 20kΩ at all inputs
    b. all resistance values (smaller or equal to) 200kΩ

    I've been beating my head against the wall trying to figure out where to get started, and or how i can calculate this. Any help would be greatly Appreciated
     
  2. Martaine2005

    Martaine2005

    2,394
    630
    May 12, 2015
    I don't think you have been banging hard enough....
    Have a little catch up here

    All jokes aside. I feel your pain.
    May be this should have been posted in the Homework section.
    Martin
     
  3. davenn

    davenn Moderator

    13,260
    1,748
    Sep 5, 2009
    indeed ... it is moved :)
     
  4. Ratch

    Ratch

    1,042
    306
    Mar 10, 2013
    I think an operational amplifier summer is in your future. See if this link gets you started. http://electronicdesign.com/ideas-design/efficiently-design-op-amp-summer-circuit

    Ratch
     
    Arouse1973 likes this.
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