Dave, it's actually not very complicated. Much of the document dwells on which buttons to push on the NFA. At its core, it's just a Y-method measurement. The formula also simplifies if you assume T=290K for the reference source and DUT. The OP didn't say much about his requirements, he may not even need ENR numbers above a GHz.
?
People can get obsessed with these numbers, similar to reference standards for voltage, resistance, etc. However, there are other sources of error that can enter into NF measurements and overwhelm ENR uncertainty. Occasionally, I see people claiming NF measurements below 0.1dB with two digits precision. In truth, at best they can make relative measurements to compare competing designs, and only when measured with the same meter and same source.
?
Vladan
?
?
On Wed, Oct 23, 2024 at 08:03 AM, Dave Miller wrote:
That looks like it will answer every question one could ever dream up.
I naively thought it would be much easier?to do.
Dave
