Test Bench for Biopotential Instrumentation Amplifier using Single-Ended to Differential Amplifiers

A practical test bench for dry electrode bio-signal instrumentation amplifier is presented and demonstrated. By modifying the on-the-shelf single-ended to differential amplifier, the common-mode rejection ratio and distortion under electrodes offset scenario can be characterized. The other essential parameters such as input impedance and power supply rejection ratio can also be determined.