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Old 4th May 2013, 05:43 AM   #1
Zero D is offline Zero D  United Kingdom
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Lightbulb Compensate Amplifiers or Not ! & How best ?

Over the past few days i've been designing some new audio circuits. I decided to experiment with different values/types of compensation, instead of the usually quoted/shown ones. In this instance these are buffers.

For years in Numerous articles etc etc, for the feedback i've seen either, a direct link, a resistor, or resistor & capacitor.

I was surprised to see the differences between them ! I discovered that a solitory resistor was best

I realise the peaks are @ Very high f's, & it's a buffer, but i'm wondering if this discovery "might" affect the performance of other circuits in some way/s, positive, or negative, when other factors are taken into consideration, such as other means of compensation etc are included ?
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Old 4th May 2013, 08:44 AM   #2
AndrewT is offline AndrewT  Scotland
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The resistor in the unity gain feedback path is specified for some opamps.
There are a couple of opamp papers that suggest this resistor should always be fitted even when the datasheet does not mention it.
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Old 4th May 2013, 02:11 PM   #3
DUG is offline DUG  Canada
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I would not worry about anomalous behavior at 3.5MHz.

What amp model was used?
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Old 5th May 2013, 11:45 AM   #4
Zero D is offline Zero D  United Kingdom
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@ AndrewT

Yes i've seen those.

@ DUG

I know but i found it interesting that it happens, & a good way to cure it.

It's an OP27
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