amplifier ][ Rogowski Coil ][

Discussion in 'The Projects Forum' started by abadi, Mar 9, 2010.

  1. abadi

    Thread Starter New Member

    Nov 8, 2009
    16
    0
    hiii guys

    im doing my FYP on amplify the voltage from a rogowski coil

    just to make it short
    i have already design the coil
    which can detect a 300k frequency and gives Vp-p = 55mV
    now, i have to design an amplifier that can give an actual value.

    so, i design the amplifier in both way which are non inverter and inverter
    but in both cases my result was an expected
    wish is Zero volt.

    im suing ic- LT1014
    and my ( Rf = 100 K ohms , Ri = 1 K ohms )
    so, my Gain is ( G = 100 )
    but i still get the wrong result .

    i got a helped before, but unfortunately i couldnt find the ICs
    because its not available in the market

    is it my mistake is
    using LT1014 ???? or what ????
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    You might post your schematic.

    The LT1014 is a precision quad op amp, but not particularly fast. If you are trying to get all that gain in one stage, the device just can't do it. The data sheet says the output only slews at 400 mv/second, pretty slow to follow 300 KHz. In a simulator, try all four sections, with gains of 3, 3, 3, and 4 (108 overall) to see if it can hack it.

    If not, look at a faster op amp - http://www.linear.com/pc/productDetail.jsp?navId=LT1630
     
  3. atferrari

    AAC Fanatic!

    Jan 6, 2004
    2,648
    764
    Actually, 400 mV / usec.
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Oops, that's even worse than a 741.
     
  5. abadi

    Thread Starter New Member

    Nov 8, 2009
    16
    0
    so thats mean your advice is to change my IC LT1014 to LT1630 ????
     
  6. abadi

    Thread Starter New Member

    Nov 8, 2009
    16
    0
    i have tried to make the gain 3, 3, 3, 4 (108)
    but it doesn't work

    im planing to buy LT 1230 ??? and its expensive
    should i go a head or what ????
     
  7. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    You could try that. It should be fast enough, but realizing a gain of 100 in a single stage at that frequency may be interesting. Get LTspice from Linear technology and simulate the amplifier.

    We do not have your schematic to look at, so there is quite a bit of guesswork involved.
     
  8. abadi

    Thread Starter New Member

    Nov 8, 2009
    16
    0
    [​IMG]that is my schematic bro
    but my problem is now the ICs of amplifier
    even LT1230 i couldnt find it
    and im running out of the time.
    so, what do you suggest ????
     
Loading...