Synchronous Demodulation for Low Noise Measurements

Authors:
  • EGErfan Ghaderi
    Erfan Ghaderi
  • BBBehraad Bahreyni
    Behraad Bahreyni
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Abstract
This paper provides an overview of the applications of synchronous demodulators for low noise measurements in a tutorial manner. Synchronous demodulators have been around for nearly a century and used extensively for precise measurements and reduction of noise bandwidth in a wide range of applications. The purpose of this paper is to briefly introduce the method that is recognized and formalize its performance. The theory explains how to amplify a narrowband signal to reduce the amount of measurement noise and how the process can be simply considered as a multiplier followed by a low-pass filter. We also introduce some of the applications and design considerations for using synchronous demodulation. Some of the advanced topics are briefly discussed with reference to the most recent contribution in this field for those interested in a deeper understanding of the content.

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