Here's a schematic of how I connected it:Īs for putting a potentiometer in to correct the offset as described here, unfortunately I don't have a negative voltage available on the board, so all the pot can do is raise the offset. I've replicated this in ltspice, even though I don't understand why it happens the impedance of a 10uf cap at 40khz is only ~0.5 ohm. I put a 10uf cap in series to ground as the answer describes and somehow, my gain at 40khz went away. The circuit works perfectly fine most of the time however, I have an unpredictable ~500uV offset on the negative input, which (with some op-amps and some populated boards) works out to an output offset that the rest of my circuit can't compensate for. I am running this op amp at a very high gain (>1000) with a 40khz input signal. The basic purpose of employing an operational amplifier in an analog circuit is to perform the function of signal amplification: The process of boosting an electrical signal of low strength to a level of. This op amp doesn't have an offset null pin. An operational amplifier is one of the basic building blocks for analog circuits, An operational amplifier takes in differential voltage input and produces a single-ended voltage output. A op amp without a null adjustment means you have to input a small current into say the inverting terminal with a pot and resistor. It changes the offset by balancing one of the internal stages in the op amp.
I have a very simple non-inverting single-supply 3.3v-0v LTC6240 circut. Using an op amp with an offset null input allows you to adjust the output offset voltage. If some of them are too similar, feel free to close. I realize that there are a lot of questions relating to op amp offset here on however, none of them seemed to answer my exact question.
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