'Need low-noise analog design consultant'
I need an analog expert to redesign a low-noise front end for medical
purposes (to measure EMG and EEG - signals in the low microvolt range). The
system we have has a million Megaohm (10^12) input impedance, 130dB CMRR,
and 12 bit resolution, but the signal waves around too much if the cables
I have seen systems that somehow minimize this effect, and need someone who
could help redesign such a front end on a contract basis.
You don't really need to redesign the analog front-end - if I understand your
it is a cable problem. You need to use low microphonics or low piezoelectric
cables. Check on
the Net for low-microphonic-noise cables. The best I have used have a low
piezoelectric coefficient insulator and carbon powder shield lubricant. I used
them for both
medical and seismic geophone transducer designs. I am assuming that you are
gel, of course, to reduce the electrode motion noise and CMRR related 60 Hz
Data Acquisition Products
San Jose, CA
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