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It reduces Johnson noise, but does it have the same effect on flickerRoko <rm382@cam.ac.uk> wrote:
wow! thanks for the prompt (and numerous) replies - especially to Win -
i can't believe that - i was reading your book today trying to figure
out how to make this thing! wow!!!!! great book btw.
ok, a few points: the sensor will be at 0.3 degrees kelvin, so thermal
noise is less of a problem, and it has a resistance of 250 ohms. this
means we're getting a thermal spectral noise density of 0.06 nV /root
Hz.
There are also LN2 cooled amplifiers, at least in the area of nuclear
physics. Cooling the first stage can greatly enhance your SNR.
than a DC coupled velocity sensor followed by a chopper. You getUwe Bonnes <bon@elektron.ikp.physik.tu-darmstadt.de> wrote:
Roko <rm382@cam.ac.uk> wrote:
wow! thanks for the prompt (and numerous) replies - especially to Win -
i can't believe that - i was reading your book today trying to figure
out how to make this thing! wow!!!!! great book btw.
ok, a few points: the sensor will be at 0.3 degrees kelvin, so thermal
noise is less of a problem, and it has a resistance of 250 ohms. this
means we're getting a thermal spectral noise density of 0.06 nV /root
Hz.
There are also LN2 cooled amplifiers, at least in the area of nuclear
physics. Cooling the first stage can greatly enhance your SNR.
It reduces Johnson noise, but does it have the same effect on flicker
noise at LF?
This is the classic reason to use an AC driven displacement sensor rather