When I was working on a cold atom Rb standard a few years ago,
I settled on the LT1028 with a 3.5 Hz (yes Hertz) noise corner and
noise floors of less than 1nV/sqrtHz and 1pA/sqrtHz. GBP>50 MHz.
Specified on the data sheet. In production now for ~40 years! I can
remember when it first came out.
What's not to like about this? Are low flicker discreet transistors
still needed?
Rick N6RK
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