EMG signals are often disguised beneath DC offsets and electrical noise. To isolate the signal, it must be amplified when it is acquired. The amplification stage can be embedded in an electrode-amplifier so that it has an AC-coupled, differential gain with high CMRR and input impedance. This project compares three possible electrode-amplifier circuit designs that use an instrumentation amplifier to provide a high input impedance and CMRR. The first design is a classic, DC-coupled instrumentation amplifier circuit with a gain of 20. The second design features an AC-suppression circuit within the classic design. The third design prepends an AC-coupling circuit to the classic design; it was analyzed and implemented with a gain of 100, a CMRR greater than 90 dB, and a low input-referred noise.

• This report represents the work of one or more WPI undergraduate students submitted to the faculty as evidence of completion of a degree requirement. WPI routinely publishes these reports on its website without editorial or peer review.

Creator

• Rubio, Graciela

Publisher

• Worcester Polytechnic Institute

Identifier

• E-project-052209-135045

Advisor

• Clancy, Edward A.

Year

• 2009

Date created

• 2009-05-22

Resource type

• Major Qualifying Project

Major

• Electrical & Computer Engineering

Rights statement

• In Copyright