Yidong Fang
ABSTRACT
This paper addresses the prevalent challenge of noise, particularly flicker noise, in Metal-Oxide-Semiconductor Field Effect Transistors (MOSFETs) that undermines signal integrity and accuracy in high-precision applications. Investigating various noise types in MOSFETs, their origins, and their impact, introduces chopper stabilization, a technique that counteracts flicker noise by modulating the input signal to a higher frequency where flicker noise is less significant and then demodulating it back after amplification. The study details the design and implementation of a chopper amplifier, using a folded cascode amplifier architecture and mixer topology, the efficacy of which in reducing flicker noise is demonstrated through Cadence software simulations. The findings underscore a considerable reduction in flicker noise, which enhances the signal quality and the overall performance of the operational amplifier, demonstrating chopper stabilization's effectiveness in attenuating noise and improving MOSFET-based circuits' reliability and accuracy. Conclusively, this research not only advances our understanding of noise issues in MOSFETs but also presents practical solutions for noise mitigation. It paves the way for future research in optimizing chopper amplifier design and exploring advanced noise suppression methods, underlining its significance in applications such as precision measuring, instrumentation, and audio systems.
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