A Low-Input Current Chopper Amplifier

Master thesis (2012)

Authors

Contributors

K.A.A. Makinwa (mentor)
Department
Microelectronics & Computer Engineering (EEMCS) (TU Delft)
Copyright: © 2012 Chava , B.C.
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Published Date

30-03-2012

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics & Computer Engineering

Abstract

This thesis describes the implementation of a low input-current chopper amplifier. Chopper amplifiers are attractive in applications where high DC precision is required, due to their low offset, drift & 1/f noise. They are generally used in the analog signal chain to boost weak sensor signals and buffer them to an analog-to-digital converter. Till recent years, research related to chopper amplifiers has focused on techniques to reduce their low frequency voltage errors and exploring effective techniques to suppress chopper-ripple. A superior performance on both these fronts has been achieved. However, at the cost of significantly large input currents (>100pA) and input current noise (>100fA/ Hz), thus limiting their usage to sensors with low source impedance (1M?) application.