In order to be more specific, will zener diodes will be effecting power rails which are supposed to be ~ 60 microvolts of RMS noise.
Will zener diode, 5V, operating at low current (powering transistor gate) effect the noise level of my rail significantly?
When I put them in "noise mode" then the measured noise (putting a bead on a lead at the transistors that its connected to grounded pin with a near by 10uF tantalum + 100nF ceramic +10nF ceramic) is ~8mV rms wide band "white" noise which looks downright putrid. I cannot measure what they put out when they are at a normal voltage though, I do not have the money for a low noise preamplifier. I do not have anywhere near the equipment to test ripple noise in the <1 milivolt region. I suppose the ultimate test is to make the board and test it with a ADC, but that's a bit pricey.
help
A graph of noise spectral density vs current of typical diodes would be appreciated.
An uncited forum posts claims a noise spectral density of 50nV/sqrt(Hz), much less then my linear regulator.