Phase Measurements and Zero Crossings

Phase Measurements and Zero Crossings

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In this chapter, a phase measurement method and a zero crossing method will be discussed. These methods are relatively simple, but they can operate only under limited conditions. If the input contains only one sinusoidal wave, these methods can provide very accurate frequency measurement. Theoretically, these methods can detect the existence of simultaneous signals. The phase measurement approach uses analog in-phase and quadrature (I-Q) channels as the front end. If the I-Q channels are perfectly balanced, the phase measurement method can measure the frequencies of two input signals. The zero crossing method can measure the frequencies of multiple input signals. However, when multiple signals are present, the frequency accuracy measured by both these two methods will suffer compared with one input signal. Some of these methods need more investigation to determine their performances.

Chapter Contents:

  • 10.1 Introduction
  • 10.2 Digital Phase Measurement
  • 10.3 Angle Resolution and Quantization Levels
  • 10.4 Comparison of Phase Measurement and FFT Results
  • 10.5 Application of the Phase Measurement Scheme
  • 10.6 Analysis of Two Simultaneous Signals
  • 10.7 Frequency Measurement on Two Signals
  • 10.8 Single-Frequency Measurement From Zero Crossing
  • 10.9 Ill Condition in Zero Crossing for Single-Signal and Remedy
  • 10.10 Simplified Zero Crossing Calculation for Single-Signal
  • 10.11 Experimental Results From Single-Frequency Zero Crossing Methods
  • 10.12 Application to Coherent Doppler Radar Frequency Measurement
  • 10.13 Zero Crossing Used for General Frequency Determination
  • 10.14 Basic Definition of the Zero Crossing Spectrum Analysis
  • 10.15 Generating Real Zero Crossings
  • 10.16 Calculating Coefficients for Zero Crossing Spectrum Analysis
  • 10.17 Possible Configuration of Zero Crossing Spectrum Analyzer
  • References

Inspec keywords: phase measurement; frequency measurement

Other keywords: zero crossing; I-Q channel; analog in-phase channel; frequency measurement; quadrature channel; phase measurement

Subjects: Phase and gain measurement; Frequency measurement

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