Last time I worked with them was about 25 years ago. It was used as a oscillator/ramp generator for a proportional heating control system in a 'Centrifichem' blood chemistry analyzer. Oppie
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The noise temperature of a FET opamp looking at say a 1 Meg or 10 Meg resistor can be truly tiny. (I guess noise temperatures only really make sense if you stick to a fixed input impedance.)
George H.
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