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Title: Phase comparator apparatus and method

Abstract

The phase change to be measured is multiply measured at artificially incred and decreased values and then averaged to result in greater accuracy. Delayed versions of the reference and input signals are compared in dual channels to the undelayed input signal and the undelayed reference signal, respectively. Resulting time-lengthened and time-shortened phase measurement signals from the dual comparator channels are algebraically combined to provide an analog output signal having an average magnitude accurately proportional to the true phase difference between the undelayed reference and the undelayed input signals. Increased linearity/reproducibility results where relatively high frequency signals (e.g., up to 70 MHz or more) are to be phase compared. An optional voltage clamp on the comparator channel outputs further improves linearity/reproducibility where very small phase differences are being measured.

Inventors:
 [1]
  1. Livermore, CA
Issue Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
866129
Patent Number(s):
4641087
Assignee:
United States of America as represented by Department of Energy (Washington, DC)
Patent Classifications (CPCs):
G - PHYSICS G01 - MEASURING G01R - MEASURING ELECTRIC VARIABLES
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
phase; comparator; apparatus; method; change; measured; multiply; artificially; incred; decreased; values; averaged; result; accuracy; delayed; versions; reference; input; signals; compared; dual; channels; undelayed; signal; respectively; resulting; time-lengthened; time-shortened; measurement; algebraically; combined; provide; analog; output; average; magnitude; accurately; proportional; true; difference; increased; linearity; reproducibility; results; relatively; frequency; 70; mhz; optional; voltage; clamp; channel; outputs; improves; differences; frequency signals; measurement signals; phase difference; reference signal; input signals; phase change; output signal; input signal; frequency signal; phase measurement; phase differences; analog output; phase comparator; measurement signal; voltage clamp; /324/327/

Citation Formats

Coffield, Frederick E. Phase comparator apparatus and method. United States: N. p., 1987. Web.
Coffield, Frederick E. Phase comparator apparatus and method. United States.
Coffield, Frederick E. Thu . "Phase comparator apparatus and method". United States. https://www.osti.gov/servlets/purl/866129.
@article{osti_866129,
title = {Phase comparator apparatus and method},
author = {Coffield, Frederick E},
abstractNote = {The phase change to be measured is multiply measured at artificially incred and decreased values and then averaged to result in greater accuracy. Delayed versions of the reference and input signals are compared in dual channels to the undelayed input signal and the undelayed reference signal, respectively. Resulting time-lengthened and time-shortened phase measurement signals from the dual comparator channels are algebraically combined to provide an analog output signal having an average magnitude accurately proportional to the true phase difference between the undelayed reference and the undelayed input signals. Increased linearity/reproducibility results where relatively high frequency signals (e.g., up to 70 MHz or more) are to be phase compared. An optional voltage clamp on the comparator channel outputs further improves linearity/reproducibility where very small phase differences are being measured.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1987},
month = {1}
}

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