Circuits and methods of TAF-DPS vernier caliper for time-of-flight measurement
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United States of America Patent
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Jun 28, 2016
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app pub date -
Jun 1, 2015
filing date -
Jun 1, 2015
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Abstract
Circuits for measuring TOF between two electrical signals comprises 1) a slow TAF-DPS clock signal generator for generating a slow clock signal, a fast TAF-DPS clock signal generator for generating a fast clock signal, said slow TAF-DPS clock signal generator comprises a gated ring oscillator and a TAF-DPS frequency synthesizer, said fast TAF-DPS clock signal generator comprises a gated ring oscillator and a TAF-DPS frequency synthesizer; 2) a phase detector for receiving said slow and fast clock signals and detecting point-of-coincidence between said slow and fast clock signals; 3) a first digital counter driven by said slow clock signal for storing the number of slow clock cycles and a second digital counter driven by said fast clock signal for storing the number of fast clock cycles; 4) a calibrator for calibrating said gate ring oscillators; 5) a calculation block for calculating TOF measurement result. Methods of using a slow TAF-DPS clock generator and a fast TAF-DPS clock generator for measuring TOF between two electrical signals are also disclosed.
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