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[SOLVED] Buffering negative voltage through OPAMP?

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trastikata

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Hello,

I am buffering a -5v reference with an OPAMP and I have a split power supply +9v and -9v, referenced to ground. So I was wondering if in this case it would make any difference if the positive supply (V+) of the OPAMP is connected either to +9v or to GND while the negative supply (V-) is connected to -9v, as indicated in the schematic.

Thanks.
 

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It should work. Th opamp only cares about the difference between it's power terminals, not absolute values.

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It should work. Th opamp only cares about the difference between it's power terminals, not absolute values. Why don't you try simulating it?
 
It should work. Th opamp only cares about the difference between it's power terminals, not absolute values. Why don't you try simulating it?
 

barry said:
Why don't you try simulating it?
Click to expand...

Thank you for your help barry but I don't know how to.

barry said:
It should work. Th opamp only cares about the difference between it's power terminals, not absolute values.
Click to expand...

Does the potential difference between the supply terminals (18v vs 9v) affect the "stability" of the output with regards to fluctuations in the supply?
 
Last edited:

trastikata said:
Does the potential difference between the supply terminals (18v vs 9v) affect the "stability" of the output with regards to fluctuations in the supply?
Click to expand...

Look at the data sheet for PSRR. But my guess is it will be fine.
 
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