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An open-source high-frequency lock-in amplifier.

G A Stimpson1, M S Skilbeck1, R L Patel1

  • 1Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom.

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|October 3, 2019
PubMed
Summary
This summary is machine-generated.

We developed an open-source lock-in amplifier using a field-programmable gate array (FPGA) for high-frequency signal demodulation. This system achieves low input noise (90 nV/√Hz) and operates on a commercial platform.

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Area of Science:

  • Electronics
  • Instrumentation
  • Signal Processing

Background:

  • Lock-in amplifiers are crucial for extracting weak signals from noisy environments.
  • Traditional lock-in amplifiers have limitations in frequency range and noise performance.

Purpose of the Study:

  • To characterize a novel field-programmable gate array (FPGA) based lock-in amplifier.
  • To evaluate its performance for high-frequency signal demodulation.

Main Methods:

  • Characterization of a custom-built lock-in amplifier.
  • Utilizing a field-programmable gate array (FPGA) for digital signal processing.
  • Measurement of input noise and passband characteristics.

Main Results:

  • The FPGA lock-in amplifier demonstrates effective demodulation up to 50 MHz.
  • Achieved an input noise level of 90 nV/√Hz at an optimal frequency of 500 kHz.
  • The system exhibits a 2.6 kHz passband width for modulation frequencies above 100 kHz.

Conclusions:

  • The developed FPGA lock-in amplifier offers competitive performance for high-frequency measurements.
  • The open-source nature and commercial platform compatibility enhance its accessibility and usability.
  • This technology advances portable and high-performance signal detection.