Dan Kemppainen wrote:
Hi,
In playing with some oscillators and a GPSDO here, I think I'm seeing
a voltage sensitivity issue.
So, I started looking at the output voltage of various regulators vs.
temp. Using standard LM/UA type linear regulators and some LDO's, they
all appear to be pretty sensitive to temperature. (millivolt / few
degrees Fahrenheit sort of sensitivity). Most of the datasheets seem
to ignore temp sensitivity. Almost like they are so bad they don't
want to publish it...
Does anyone have hints on TO-220 or D-Pak type regulators that have
really good temp coefficients and good line regulation? A few PPM/Deg
C might be nice, if possible. Or am I into a 'roll you own' type
design...
Dan
Yes, in order to get low PPM stability, you are going to "roll your own".
No 3-terminal regulator or reference that I know of can run an OXCO (heater
and oscillator).
What are your voltage and current requirements?
Dave M
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