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Subject: op-amp design techniques

Date: 11/22/02 at 3:02 AM
Posted by: David
E-mail: david@project2000.com.au
Message Posted:

To all op-amp enthusiests (i know i didn't spell that right!),

I have designed a circuit to measure the voltage across a very small resistor, the reason being is that i'm using about 100V. To make the measurement and ensure i have the right level i am using a Difference Amplifier circuit. However, i need to make a significant reduction in voltage before entering the op-amp inputs, or should i say, the differential amp circuit inputs.

My question is: do i need to isolate the voltage divider circuit (100 to ~15V) from the diff amp or can i leave it as is. Or, can i somehow integrate the voltage divider into the diff amp topology?

I look forward to your help.

David.


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