I usually duplicate part of a circuit to use for selecting transistors for noise, but wondered if there was something more standardized. There seems to be a dearth of info on the topic both in print and on the 'net. One of the Ott noise books has a pretty good mathematical description, but little practical advice. Are there any standard configurations for noise testing? I know there's an EIA standard of some sort, but no free copies.
I would build an simple amplifier at similar Ic to the working conditions and low source resistance for base bias. Run at a high gain of 40dB and then further amplification to the meter is straightforward. Everything in a metal box and much attention to filtering the power supply
Makes sense and is what I'm doing, but based on the lack of responses, am I asking the wrong question? Does nobody measure noise and just rely on the datasheet NF values? Does nobody screen for popcorn noise? It's rare, but I've had it happen on one or two devices out of a bag.
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