You can improve the performance of the LM723 if one substitutes an LM329
for the internal reference biased from the regulator output.
The trick is to use the internal reference for startup and decouple it
with a diode or similar once the LM329 achieves its nominal output.
Currently, there appear to be 2 variants of the LM723 one (made by
National) that uses a noisy bandgap reference and another variant that
actually uses a quieter zener reference.
Bruce
Brooke Clarke wrote:
Hi neville:
My old Gibbs rack mount 5 MHz standard used the LM723 linear
regulator. I believe it's one of the lowest noise regulators you can
use.
http://www.national.com/mpf/LM/LM723.html#Overview
Have Fun,
Brooke Clarke
http://www.PRC68.com
Neville Michie wrote:
Hi,
I remember a reference, probably by Bruce, that LEDS provide a low
noise voltage reference.
I am proposing to build a voltage regulator for a thermally
controlled LPRO rubidium oscillator,
with the voltage regulator being mounted on the 0.5 inch thick
aluminium heat sink plate.
The LEDS would also be mounted on the plate, which has controlled
temperature.
The LPRO has internal voltage regulation, and by running it at ~40C
and 18Volts, the thermal
flux within the unit is minimised as is the power demand.
What I want to know is if a LM317 running on a stack of LEDs driven
by the LM317 output
would provide a low noise power source? What would be better?
cheers, Neville Michie
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