On 7/8/19 8:38 AM, Richard (Rick) Karlquist wrote:
Regarding the E1938A schematic:
Although not references per se, the LT3042/LT3045/LT3045-1
are extremely low noise voltage regulators. Actually,
if there are any time nuts who haven't yet heard of these,
the data sheets should be considered required reading.
Recently, ADI introduced a family of negative regulators
that are basically exact mirror images of the positive
regulators, right down to the same pin out. The LT3093
is a negative version of the LT3042 and the LT3094 is
a negative version of the LT3045-1. ADI has done an
outstanding job of supporting the chips with reference
designs and PC board layout tips along with evaluation
boards.
Not only are they low noise, but they have spectacularly good HF
rejection across the regulator up to 10s of MHz.
I highly recommend them.
They appear to be reasonably radiation tolerant, too, although not
advertised as such.
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