arthurartmaster
Member
Hi All
I have designned differential amplifiers using seperated op-amps and external resistors (in retrospect unfortunatley I should have used either instrumentation amplifiers or difference amplifiers with laser trimmed internal resistors). I am using 1% resistors and have noticed that the common mode is having an effect on the gain that I wish it changes i.e. changes depending on the input voltage. In the application space I am working the difference in voltage between inputs will be between 0.1-1V. I was wondering if anyone could suggest a more suitable op-amp for this application, I am also going to try switching to 0.1% resistors to see how much of an effect that has but any help would be greatly appreciated.
Kind Regards
Art
I have designned differential amplifiers using seperated op-amps and external resistors (in retrospect unfortunatley I should have used either instrumentation amplifiers or difference amplifiers with laser trimmed internal resistors). I am using 1% resistors and have noticed that the common mode is having an effect on the gain that I wish it changes i.e. changes depending on the input voltage. In the application space I am working the difference in voltage between inputs will be between 0.1-1V. I was wondering if anyone could suggest a more suitable op-amp for this application, I am also going to try switching to 0.1% resistors to see how much of an effect that has but any help would be greatly appreciated.
Kind Regards
Art