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Inverting vs non-inverting - Pros and Cons
ricko_uk:
Hi,
often using inverting or non-inverting does not really make any difference. But in some instances it does.
Does anybody have a summary of pros and cons of the two configurations? From simple things like gain (R2/R2 vs 1+R2/R1) to input impedance to noise levels to the fact that inverting can be used as a mixer etc. etc.?
We could compile a list here then I can summarise all points at the end into a downloadable PDF for anybody to download.
Many thanks :)
Wimberleytech:
--- Quote from: ricko_uk on February 12, 2020, 03:29:19 pm ---Hi,
often using inverting or non-inverting does not really make any difference. But in some instances it does.
Does anybody have a summary of pros and cons of the two configurations? From simple things like gain (R2/R2 vs 1+R2/R1) to input impedance to noise levels to the fact that inverting can be used as a mixer etc. etc.?
We could compile a list here then I can summarise all points at the end into a downloadable PDF for anybody to download.
Many thanks :)
--- End quote ---
1)
A non-inverting configuration suffers from CMRR limitations of the opamp because it naturally has a common-mode signal, whereas an inverting configuration has zero CM input.
2)
An inverting configuration has a lower BW than the non-inverting for the same absolute gain.
3)
Non-inverting configuration has a higher input resistance than inverting.
ricko_uk:
Any other suggetions/contributions from anybody else? :)
And thank you Wimberleytech!! :)
moffy:
Inverting, according to Jim Williams, has lower input distortion because the input circuit is kept close to a constant value. Therefore less overall distortion.
Wimberleytech:
Inverting configuration offers the ability to do summing in a straightforward manner.
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