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limitation of opamp in the single supply differential mode

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Hesambook

Hesambook

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Hi,

I have a sensor which is connected to +12V and it shows some small variations at the output.

I have an opamp which I have configured in AC input, inverting amplifier. therefore I should supply it with the load voltage and then find the best value for + rail (by default the half of the VCC which is 6), something like the figure below, but the opamp maximum supply is 3.3V. I am bounded to use this opamp and I can not change the sensor voltage.

rqyc_design1.gif


is there any method to fix this problem?
 

Hi,

I have a sensor which is connected to +12V and it shows some small variations at the output.
Click to expand...
--> show the complete circuit including the sensor connections

--> show the sensor´s datsheet

I have an opamp which I have configured in AC input, inverting amplifier.
Click to expand...
--> What exact OPAMP? manufacturer and type..

therefore I should supply it with the load voltage
Click to expand...
What do you mean with "load voltage"?

and then find the best value for + rail (by default the half of the VCC which is 6)
Click to expand...
Confusing.
"+ rail" usually means "positive supply" which is pin7
--> or do you mean "+IN"?

What do you mean with "which is 6)"?
Pin 6? --> pin 6 is the OPAMP output
6V? --> Why 6V?

but the opamp maximum supply is 3.3V
Click to expand...
Why?
Because of datasheet spec?

I am bounded to use this opamp
Click to expand...
Why?

I can not change the sensor voltage.
Click to expand...
What sensor voltage?
Supply voltage? --> I see no need for changing the supply voltage. The OPAMP circuit does not care about sensor supply voltage.

Klaus
 

Need some kind of voltage regulator for the 3.3V OP. If the load impedance isn't low, a zener diode circuit might be sufficient. Or use a 12V capable OP.
 

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