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Direct precision frequency measurement and correction technology with double ADC.

L N Bai1, H D Liu1, T T Wang1

  • 1Department of Measurement and Instrumentation, Xidian University, Shaanxi 710071, China.

The Review of Scientific Instruments
|January 1, 2018
PubMed
Summary

This study introduces a novel direct precision frequency measurement method using a clock cursor effect and analog-to-digital converter (ADC) error suppression. The developed frequency corrector achieves high stability and precise correction for crystal oscillator signals.

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Area of Science:

  • Electrical Engineering
  • Metrology
  • Signal Processing

Background:

  • Traditional frequency synthesizers face limitations in precision and output range.
  • Accurate frequency measurement is crucial for various electronic systems and scientific research.
  • Existing methods struggle with analog-to-digital converter (ADC) quantization errors and non-standard reference signals.

Purpose of the Study:

  • To propose a new direct precision frequency measurement method.
  • To design a precision frequency corrector utilizing advanced digital measurement techniques.
  • To achieve high-accuracy frequency correction for crystal oscillator signals.

Main Methods:

  • Implementation of the clock cursor effect between sampling clock and input signals.
  • Application of analog-to-digital converter (ADC) quantization error suppression.
  • Development of a precision frequency corrector using a double ADC architecture.

Main Results:

  • Achieved a frequency correction range from 0.0001 Hz to 0.1 Hz.
  • Demonstrated a second stability of less than 3 × 10-12.
  • Enabled frequency correction in the order of 10-11 magnitudes.

Conclusions:

  • The proposed method offers a significant improvement over traditional frequency synthesizers.
  • The precision frequency corrector effectively converts non-standard crystal oscillator signals into standard frequency outputs.
  • This technique enhances the accuracy and stability of frequency generation and measurement.