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Old 8th July 2005, 12:40 PM   #1
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Default Super reg question -- on references

in an article appearing in the late 1990's a fellow ham radio op used multilple Thaler voltage references (don't worry, you won't be able to find them) to reduce the noise, tempco effects and improve acuracy. The result was a DIY voltage measurement unit which was approaching the acuracy of high end HP, Keithley and Fluke equipment.

how would this affect the "noise" of the Super-Reg if one were to combine multiple references, RC filtering with an ultra-low noise error amp (like the AD797)?
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Old 10th July 2005, 08:48 PM   #2
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Just wondering but how much noise did this super reference produce really? A LM329/LM199 and LTZ1077(?) are all pretty good and a plain LM431 with the normal heavy LP-filter will also be rather low noise-ish.

ADR420 is pretty good also from Analog Devices.
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Old 10th July 2005, 09:01 PM   #3
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they have references with 1, 3 and 6uV LF noise -- of course you have to look at the tempco stats etc. . They are available in K and H grades.
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