Circuits to assess the performance of single vs. Dual power supply in an OP- Amp - diyAudio
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Old 18th October 2013, 12:29 PM   #1
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Default Circuits to assess the performance of single vs. Dual power supply in an OP- Amp

Hi, I am going to write a research paper on OP AMP and i found the topic of power supply very intriguing hence, i looked for resources that would give me more knowledge on the Performance between these two supply modes, but i couldn't find much information about it. I was wondering if you could show me circuit that I can use to assess the performance (in various levels) of the OP AMP doing the same task.

Thanks in advance.
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Old 18th October 2013, 01:35 PM   #2
Fenris is offline Fenris  United States
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There effectively is no difference. Voltages are relative, not absoloute. It's down to the quality/implementation of the power supply. A dual power supply is no better or worse than a single supply with a proper virtual ground. Also, you don't always need a dual supply, sometimes a single supply works just fine, especially for DC coupled or oscillator circuits. Audio tends to use a ground and it's not always implemented properly. An example of virtual grounds is here:
Virtual Ground Circuits
Listen to the music through the stereo, not the stereo through the music.
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Old 18th October 2013, 01:53 PM   #3
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Default experimental circuit

I dont really know much about electronic theory. But i wanted to find about the circuits that shows these characters. Can you provide me link to these circuits
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Old 21st October 2013, 01:34 AM   #4
sohan is offline sohan  United States
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u can use RMMA to compare bandwidth, SNR, THD and etc.. of each configuration.
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Old 21st October 2013, 03:31 AM   #5
gootee is offline gootee  United States
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There are op amps that are designed to run best on a single supply. There are also op amps that can run on either a dual supply or a single supply. Basically, all op amps can be run on either a single or a dual (split) power supply.

Here is one possibly-relevant resource, comparing single-supply-optimized op amps to dual-supply op amps:

Op Amp Applications Handbook - Google Books

And here is a link to a free download of that book:

ADI - Analog Dialogue | Op Amp Applications Handbook

This might be more than you wanted to know but it is relevant:

Here is the book "Op Amp Basics":

And here is the book "Op Amps for Everyone":
The electrolytic capacitors ARE the signal path:

Last edited by gootee; 21st October 2013 at 03:48 AM.
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Old 22nd October 2013, 06:21 PM   #6
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Most of the results you are likely to see with large signals will depend on the capacitors you use to create the floating "ground" for the single rail example. But when the signals get small, the problems with noise on the rails may dominate. Having the negative rail grounded could be an advantage, but you will need a quiet supply for the other rail. You will need to be using a high resolution digitizing measurement system capable of seeing distortion products down to about -160dB.
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