The dual approach of digital and analog lock-in amplifier technologies has continued to advance the precise extraction of weak signals from noise-laden environments. These devices are indispensable in ...

This application note describes instrumentation amplifiers, theory of operation, advantages, and typical application circuits. These devices are micropower Instrumentation Amplifiers which deliver ...

Signals are acquired from the subject by electrodes in contact with the skin, or by needles inserted in living tissue. The source impedance (electrodes, needles, etc.) is usually high and variable. It ...