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Answer: It may not be the amplifier causing the trouble; analyze where the noise is actually coming from. A typical operational amplifier circuit contains six uncorrelated noise sources (the smaller ones can usually be disregarded 1). The amplifier itself has three separate noise sources: a voltage noise source appears differentially across the inputs; and current noise sources appear in series with both inverting and non-inverting inputs. Remarkably often the problem is not the amplifier, though, but the thermal noise generated by one or more of the three resistors that set the amplifier gain and provide bias current compensation. Analog Devices has over sixty types of op amps whose voltage noise is less than that of a 1 kΩ resistor

Johnson nyquistJohnb johnson bellHarry nyquistAnalog devicesBell telephone laboratoriesBell laboratoriesProfessor boltzmannஹாரி நைக்விஸ்ட்அனலாக் சாதனங்கள்மணி தொலைபேசி ஆய்வகங்கள்மணி ஆய்வகங்கள்