Hi,
Note: Using LM741
I have a DC input at about ranging from -0.1 to 0.1V with a permanent fixed offset of about 0.04V. I would like to remove this offset, AND amplify the voltage ACCURATELY 10 times.
So I designed a simple, difference amplifier to remove the 0.04V offset, and then a 10 gain amplifier. However, in simulations each of the output voltages from each system is slighly off (assuming due to input offset of op-amp). I've tried to compensate for the offset using pots at the offset nulling pins but has no effect in the simulation so i'm not sure whether it will in real life.
Does anyone have any recommendation on how I can fix this, or possibly some more accuracte op-amps I should use for this purpose? I would like to have the voltage output no more than 1 or 2 mV out so I need some fairly high accuracy components.
Thanks
-Peter
Note: Using LM741
I have a DC input at about ranging from -0.1 to 0.1V with a permanent fixed offset of about 0.04V. I would like to remove this offset, AND amplify the voltage ACCURATELY 10 times.
So I designed a simple, difference amplifier to remove the 0.04V offset, and then a 10 gain amplifier. However, in simulations each of the output voltages from each system is slighly off (assuming due to input offset of op-amp). I've tried to compensate for the offset using pots at the offset nulling pins but has no effect in the simulation so i'm not sure whether it will in real life.
Does anyone have any recommendation on how I can fix this, or possibly some more accuracte op-amps I should use for this purpose? I would like to have the voltage output no more than 1 or 2 mV out so I need some fairly high accuracy components.
Thanks
-Peter