Low noise voltage at the cost of noise current which is around 1000 times that
of low noise JFETs.
The discussion suggest that opamps contribute to the sideband phase noise
of the signal. I am interested in the mechanism that adds this phase noise.
It would have to be a small shift in either gain (changing Miller
capacitance) or
an internal capacitance in the opamp.
I am new to this group and have some catching up to do.
I know of one op-amp that comes close to 1 nV/rtHz at 10 Hz and being
capable of useful operation as a 10 MHz distribution amplifier -- the
ADA4898 (1.2 nV/rtHz at 10 Hz, 4.3 nV/rtHz at 1 Hz). These are
wonderful parts, but the large signal frequency response with a 100
ohm load is less than desired for a 10 MHz distribution amplifier.
73
Bill wa4lav
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