Abstract
Using electrodes to read electrical signals from the human body and display them on an oscilloscope requires an analog front end to properly capture, amplify, and digitize the voltage levels from the electrodes. The first stage of the analog front end is the low noise amplifier (LNA), which is designed to amplify the signal by 40db or more, without adding significant noise. This application also requires the LNA to reject any common-mode noise that may be present on the signal by at least 100db.