Faculty Advisor

Clancy, Edward A.


In this project we designed two different biopotential electrode-amplifiers that will be used, in future research, to measure and amplify action potentials in skeletal muscles of the human body. One design is a bipolar biopotential electrode-amplifier that amplifies the potential difference between two electrode contacts, which are placed on the skin. The other, is a monopolar biopotential electrode-amplifier, which contains five electrode contacts arranged close together to measure the skeletal muscles more closely. The bipolar electrode-amplifier designs have been manufactured with and without a printed circuit board (PCN), and have been fully tested. The monopolar electrode-amplifier has been designed, but not manufactured. These devices provide a gain of 100; have noise less than 1.5V referred to the input over the 10-500Hz band, and a pass band of 10-10,000Hz. In addition, the bipolar electrode-amplifier has a common mode rejection ratio (CMRR) greater than 90dB.which will measure the skeletal muscles more closely. Ultimately, the manufactured biopotential electrode-amplifiers will be connected to a signal condition and oscilloscope/PC so that the signal may be conditioned, digitzed and recorded.


Worcester Polytechnic Institute

Date Accepted

January 2002


Electrical Engineering

Project Type

Major Qualifying Project


Restricted-WPI community only

Advisor Department

Electrical and Computer Engineering