Preamplifier

The Analog Devices AD8009 amplifier is a sensible choice for the front end amplifier. General concerns include:

a)

Control of gain and offset variation due to temperature and other environmental effects. The required experimental control of gain and offsets was not clear.

b)

A coherent grounding plan is advisable, and was not present at time of the review. Ground loops are a common problem of large extended systems such as the one proposed. Careful attention to minimizing ground loops and maintaining one clear system ground reference will go a long way in reducing noise and improving stability.