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Old Yesterday, 01:35 AM   #1
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Default Best way to implement a voltage gain stage with opamp?

I was wondering is there anyway to make an opamp sound better than the non-inverting configuration? When talking about opamp, i see most of the configuration both diy and commercial end up with just several resistor in non-inverting mode. Is that the best way to implement an opamp?
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Old Yesterday, 03:41 AM   #2
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Is there anyway better than non-inverting mode ?
-----Can you post more detile information about non-inverting mode?
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Old Yesterday, 03:43 AM   #3
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In my experience opamps sound better the more attention that's paid to the power supply.
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Old Yesterday, 04:36 AM   #4
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Quote:
Originally Posted by Marco Ren View Post
Is there anyway better than non-inverting mode ?
-----Can you post more detile information about non-inverting mode?
Non inverting mode like a cmoy

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Originally Posted by abraxalito View Post
In my experience opamps sound better the more attention that's paid to the power supply.
Of course an amp will sound better with better power supply, but i'm asking about how to implement an opamp.
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Old Yesterday, 06:38 AM   #5
Mooly is offline Mooly  United Kingdom
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Make sure the opamp isn't on the verge of instability. Squarewave test the circuit and apply compensation if required. Add an RF input filter. Consider trying minor manipulation of the "noise gain" to reduce the open loop gain of the opamp.

A Different Opamp Compensation Technique.
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Old Yesterday, 09:20 AM   #6
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Originally Posted by Mooly View Post
Make sure the opamp isn't on the verge of instability. Squarewave test the circuit and apply compensation if required. Add an RF input filter. Consider trying minor manipulation of the "noise gain" to reduce the open loop gain of the opamp.

A Different Opamp Compensation Technique.
Thanks Mooly, your thread is so interesting but i wonder if i use inverting configuration, do i need to use at least 2 opamp to get the output signal back to it original polarity?

Last edited by proid; Yesterday at 09:42 AM.
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Old Yesterday, 09:43 AM   #7
Mooly is offline Mooly  United Kingdom
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You can apply the same technique to the non inverting configuration. R3 in this diagram.
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File Type: png Noise Gain.PNG (44.7 KB, 47 views)
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Old Today, 07:01 AM   #8
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Originally Posted by Mooly View Post
You can apply the same technique to the non inverting configuration. R3 in this diagram.
Thanks, i will try this.
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Old Today, 07:06 AM   #9
Mooly is offline Mooly  United Kingdom
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OK. Its well worth trying.
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Old Today, 03:00 PM   #10
jcx is offline jcx  United States
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bad example Mooly - I don't think so - not with that chip, those high R values


proper op amp selection and the standard circuit are fine until you want better than -100 dB distortions with high source Z

you need to decide if that is your "problem" now or not? - don't let futile search for "best" when you don't yet even understand the dimensions of the problem get in the way of moving forward with proven circuits
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