The circuit is a standard non-inverting amplifier with a resistance in series with the non-inverting input to measure bias current noise. The first component to test is a low-noise op-amp. LTspice Noise Simulation Example: Low-Noise Op-Amp ![]() An excellent explanation of converting an RMS value to peak-to-peak is in this video from Analog Devices. How accurate are the measurements? Are they useful? To find out, the results are compared to noise specifications in datasheets.Īn excellent summary of op-amp noise and how noise sources combine can be found in this article and app note from Analog Devices. This article shows how to use LTspice to measure the noise of an op-amp and of an op-amp combined with a dual-JFET input stage. ![]() In previous articles, we introduced modeling noise with LTspice and simulating noise sources in LTspice. Learn how to measure noise using LTspice for op-amp circuits with handy examples.
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