Re: [OFF TOPIC] [rtl] how to amplify the signal from the detector?

[Tomasz Motylewski <motyl@stan.chemie.unibas.ch>]

On Thu, 7 Oct 1999, ahgu wrote:

> Wonder if anyone encountered the signal amplification problem. My detector
> give out slow-varying DC signal in couple mV range. My A/D board reads 0-5V
> and I need all the 16bit resolution. Where would I get a DC amplifier to

Look at the list at http://www.xs4all.nl/~ganswijk/chipdir/f/amp.htm
and choose some high precision low noise stable instrumentation amplifier.

I have been using OP07, but there are probably better ones.
See http://www.analog.com/pdf/op07.pdf

Be aware that 16 bits at 5 mV means 76 nV precision. So your amplifier should
be attached directly to the detector, everything well shielded, stable (good
resistors, possibly temperature stabilised, some RC filter to reduce the
higher frequency noise). If signal changes slowly, avaraging lots of samples
will reduce noise significantly. In my experience, getting noise below 0.1 mV
might be very tricky.

Best regards,
--
Tomek

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