Electronics > Metrology

Ultra Low Noise Reference 2DW232, 2DW233, 2DW23x

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Kleinstein:
The noise part looks OK. It is however hard to say how much of the noise is from the DUT. Most of the noise could well be from the meter itself. It still shows that this ref. sample has no excessive noise.

The dift is some 20 ppm over nearly half a year. With the limited number of points it is hard to tell if the drift is really slowing down and the voltage settling. Another point is that the temperature may have changed between the measurements. So part of the drift could be a temperature effect. Finally the 6.x to 10 V gain step could also contribute to drift.

iMo:
No idea what the temperature there is like (meter or ambient or reference?)..

lichen867:
the root cause might be effect of stress. mechanical stress will be recorded by the chip，thus you will see different voltage even at same temperature.

ZhuraYuk:
So I bought 10 of 2DW232 few years ago. Today when my low noise amplifier is ready (clone of LFLNA-80) it is time to measure if these are worth of my time.
So amplifier noise specs are following - 0.1 -10 Hz 17nV RMS 120nV PtP
Lowest noise level was observed at 4 mA current for any 2DW232  I tried. It is about 110nV RMS 620nV PtP. At 23mA like people are posting here the noise is few microvolts, very high.
Connecting 5 2DW232  in parallel gives around 58nV RMS and 350nV PtP noise levels  (10 Volts outputs, with op amp, two transistors and 5 ppm resistors in divider circuit)
Conclusion - if you need low noise levels this is very good solution, similar to ADR1001.

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