Date: Sun, 6 Apr 2003 22:08:56 -0400

Author:

Subject: Re: differential amp

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David,

If your precision resistors are the wire wound type then their inductance may be the culprit. You might try usung non-wire wound precision R's.

Also, Burr-Brown (now owned by TI) has a nice precision diff amp and precision R's on a chip the INA105. Jerry

>
> From: "David Kardelis"
> Date: 2003/04/06 Sun PM 02:17:08 EDT
> To:
> Subject: differential amp
>
> I tried earlier this term to make a differential amplifier using an
> op-amp and precision resistors. One problem I couldn't get rid of was
> an initial overshoot and subsequent ringing when using a square wave. I
> also tried just using a comparator, but the output was not constant with
> frequency.
>
> Anyone have a circuit to make a set of differential inputs that can be
> used to look at different parts of a circuit using an oscilloscope and
> avoiding the common ground issue. Would like it to be useful over audio
> frequencies.
>
> Thanks dave
>
> David Kardelis, Ph.D.
> david.kardelis@ceu.edu
> Chairman, Dept of Chemistry and Physics 435-613-5258
> College of Eastern Utah
> 435-613-4201 (fax)
> 451 E 400 N
> Price UT 84501
>
>
>

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I tried earlier this term to make a differential amplifier
using an op-amp and precision resistors. 
One problem I couldn’t get rid of was an initial overshoot and
subsequent ringing when using a square wave. style='mso-spacerun:yes'> 
I also tried just using a comparator,
but the output was not constant with frequency. style='mso-spacerun:yes'> 



 



Anyone have a circuit to make a set of differential inputs
that can be used to look at different parts of a circuit using an oscilloscope
and avoiding the common ground issue. Would like it to be useful over audio
frequencies. 



 



Thanks dave



 



style='font-size:10.0pt;font-family:Arial;mso-no-proof:yes'>David Kardelis size=2 face=Arial>,
Ph.D.                                               
david.kardelis@ceu.edu



Chairman, Dept of Chemistry and
Physics                 
435-613-5258



style='font-size:10.0pt;font-family:Arial;mso-no-proof:yes'>College of
Eastern
style='font-size:10.0pt;font-family:Arial;mso-no-proof:yes'> size=2 face=Arial>Utah
style='font-size:10.0pt;font-family:Arial;mso-no-proof:yes'>                                           
435-613-4201 (fax)



451 E 400 N style='mso-no-proof:yes'>



style='font-size:10.0pt;font-family:Arial;mso-no-proof:yes'>Price size=2 face=Arial> UT size=2 face=Arial> style='font-size:10.0pt;font-family:Arial;mso-no-proof:yes'>84501



 










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From msimon@physics.ucla.edu Mon Apr 7 00:18:11 2003

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