generating low noise source of 100 microVolts to 1mV

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saurabh17g

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Hello,

I want to design a voltage source of with voltage ranges from 100 microVolts to 1 mV. I want it for biomedical instrumentation(EEG/ECG). I was thinking of voltage divider but that would not work because of resistance and supply noises. Please suggest me some better way.
 

How about 1mA-10mA current source, which is reasonably easy to realize, and 0.1 Ω shut resistor?
The voltage across resistor will vary from 100uV to 1mV and the output impedance will be 0.1 Ω ..

IanP
;-)
 
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