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MS Final Exam – OnnLim Yong

A Fully Integrated Bio-potential Low-noise Amplifier Utilizing Capacitive Multipliers

In any biomedical signal acquisition system, a front-end amplifier is needed to amplify low amplitude bio-signals while filtering out any unwanted low-frequency artifacts. The design of low frequency poles within the sub-Hz range implies very large time-constants which goes against system integrability. In recent years, the pseudo resistor has been used to provide very large on-chip resistance to achieve sub-Hz pole frequency. However, the pseudo resistor behaves poorly across PVT variations and is highly non-linear which makes the low-frequency pole unpredictable. In this thesis, a bio-LNA utilizing a differential difference amplifier structure along with gm-C filters is examined. The differential topology provides high CMRR while the negative feedback through the gm-C filter provides the low-frequency pole. A capacitor multiplier is also implemented to achieve a very high value effective on-chip capacitance. The functionality of the bio-LNA is validated through simulations in Cadence.

Major Advisor: David Allstot
Committee: Un-Ku Moon
Committee: Matthew Johnston
GCR: Leonard Coop

Thursday, March 7 at 10:00am to 12:00pm

Kelley Engineering Center, 1126
110 SW Park Terrace, Corvallis, OR 97331

Event Type

Lecture or Presentation

Event Topic

Research

Organization
College of Engineering, Electrical Engineering and Computer Science
Contact Name

Calvin Hughes

Contact Email

Calvin.Hughes@oregonstate.edu

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