I want to design a voltage divider circuit to bias an op amp, this circuit will be a part in another circuit to measure a biomedical signal. Is there a noise issue arises from using voltage divider to provide biasing? if I choose R1 = 10K and R2 = 10K, then will it make any difference if I choose R1 = 10M and R2 = 10M?
In a paper I read the following:
Using a simple resistive bias network is impractical from a reliability and noise standpoint.Although a biasing resistor can be bootstrapped to the required resistance, minimizing its current noise contribution requires an impossibly high value
I don't know if they mean a voltage divider by "simple resistive bias network", but I assumed that.