calculate slew rate and gbw.

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Discussion in 'General Electronics Chat' started by hiren.dave, Sep 12, 2012.

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  1. Sep 12, 2012 #1
    hiren.dave

    Thread Starter New Member

    Jun 22, 2012
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    Hi,

    i want to calculate slew rate and gainbandwidth product with following parameters.

    pulse amplitude: 23 to 30mV.
    pulse time: 140ns.
    gain: 47 times.

    help me to calculate slew rate and bandwidth for this parameter. it's better if you suggest a particular IC.

    thanks,
     
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  2. Sep 12, 2012 #2
    bertus

    Administrator

    Apr 5, 2008
    18,990
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    Hello,

    What is the shape of the pulse?
    What is the rise and fall time of the pulse?

    Bertus
     
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  3. Sep 12, 2012 #3
    hiren.dave

    Thread Starter New Member

    Jun 22, 2012
    20
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    friend,

    I don't know the pulse rise or fall time. and pulse shape should be half of cycle of sine wave.
     
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  4. Sep 12, 2012 #4
    bertus

    Administrator

    Apr 5, 2008
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    Hello,

    I assume this thread is a continuation of your last thread:
    detect pulse of 140ns and 50mv.

    Now you want to amplify the 23 mV pulse to about 1 V.
    The slew rate must be higher tan 1 V / 70 nSec = 14.3 V / μSec.
    The GBW must be higher than (1 / 280 μSec) * 47 = 168 Mhz.

    Bertus

    PS I have posted the same answer in your other thread.
    I can merge the threads if you want to.
     
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  5. Sep 12, 2012 #5
    hiren.dave

    Thread Starter New Member

    Jun 22, 2012
    20
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    thanks again my friend...

    Yes, this thread is continuation with my old thread.
    I was little confused, so i post a question again.
     
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  6. Sep 12, 2012 #6
    hiren.dave

    Thread Starter New Member

    Jun 22, 2012
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    friend, you told me that i should use opamp with minimum 70V/us slew rate. and now 14.3V/us.
    which one should i use?
     
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  7. Sep 12, 2012 #7
    bertus

    Administrator

    Apr 5, 2008
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    Hello,

    The 70 Volts / μSec is for a 5 Volt pulse.
    The 14 Volts / μSec is for a 1 Volt pulse.

    Bertus
     
    #7 Reply
  8. Sep 12, 2012 #8
    hiren.dave

    Thread Starter New Member

    Jun 22, 2012
    20
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    thanks again my friend.....
     
    #8 Reply
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