Phase detector capable of detecting an accumulated value of phase displacement at a high speed and frequency stability measuring apparatus for arbitrary nominal frequency using the same
First Claim
1. A phase detector for receiving in-phase signal I representing in-phase component and quadrature signal Q representing quadrature component of first signal and second signal, respectively, and determining a variation of phase of the second signal with respect to a phase of the first signal, comprising:
- a phase region detector which equally divides an angle range of 2 π
preliminarily, on virtual quadrature coordinates expressing the in-phase signal I and quadrature signal Q, into a plurality M of three or more of angle regions, sequentially assigns angle region numbers in each of the angle regions, detects the angle region corresponding to the variation of phase of the second signal starting from the phase of the first signal, and issues the angle region number assigned in the detected angle region, a phase displacement detector which issues a signal expressing the time change of the variation of the phase from the change corresponding to the time of the angle region number issued from the phase region detector, an out-of-bounds detector which receives a signal issued from the phase displacement detector, and issues an out-of-bounds signal including the out-of-bounds direction every time the variation amount of the phase exceeds a predetermined value on the virtual quadrature coordinates, a phase rotation counter which issues the number of rotations of the phase on the virtual quadrature coordinates by accumulating the out-of-bounds signals issued from the out-of-bounds detector, and a displacement accumulator which determines the cumulative value of phase displacement determined by the in-phase signal I and quadrature signal Q, based on the angle region number issued by the phase region detector, the number of angle regions, and the number of rotations of the phase issued by the phase rotation counter.
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Abstract
A phase region detector receives in-phase signal I representing in-phase component and quadrature signal Q representing quadrature component of a first signal and second signal respectively, equally divides an angle range of 2 π into a plurality M of three or more of angle regions preliminarily, on virtual quadrature coordinates, sequentially assigns angle region numbers in each of the angle regions, detects the angle region corresponding to the variation of phase of the second signal starting from the phase of the first signal, and issues the angle region number assigned in this angle region. A phase displacement detector issues a signal expressing the time change of the variation of the phase from the change corresponding to the time of the angle region number. An out-of-bounds detector receives a signal issued from the phase displacement detector, and issues an out-of-bounds signal including the out-of-bounds direction every time the variation of the phase exceeds a predetermined value. A phase rotation counter issues the number of rotations of the phase by accumulating the out-of-bounds signals. A displacement accumulator determines the cumulative value of phase displacement determined by the in-phase signal I and quadrature signal Q, based on the angle region number, the number of angle regions, and the number of rotations of the phase.
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Citations
28 Claims
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1. A phase detector for receiving in-phase signal I representing in-phase component and quadrature signal Q representing quadrature component of first signal and second signal, respectively, and determining a variation of phase of the second signal with respect to a phase of the first signal, comprising:
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a phase region detector which equally divides an angle range of 2 π
preliminarily, on virtual quadrature coordinates expressing the in-phase signal I and quadrature signal Q, into a plurality M of three or more of angle regions, sequentially assigns angle region numbers in each of the angle regions, detects the angle region corresponding to the variation of phase of the second signal starting from the phase of the first signal, and issues the angle region number assigned in the detected angle region,a phase displacement detector which issues a signal expressing the time change of the variation of the phase from the change corresponding to the time of the angle region number issued from the phase region detector, an out-of-bounds detector which receives a signal issued from the phase displacement detector, and issues an out-of-bounds signal including the out-of-bounds direction every time the variation amount of the phase exceeds a predetermined value on the virtual quadrature coordinates, a phase rotation counter which issues the number of rotations of the phase on the virtual quadrature coordinates by accumulating the out-of-bounds signals issued from the out-of-bounds detector, and a displacement accumulator which determines the cumulative value of phase displacement determined by the in-phase signal I and quadrature signal Q, based on the angle region number issued by the phase region detector, the number of angle regions, and the number of rotations of the phase issued by the phase rotation counter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A frequency stability measuring apparatus comprising:
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a frequency converter for converting a reference signal and an object signal to be measured equal in nominal frequency into a band below a specified frequency, first and second A/D converters for converting the reference signal and object signal to be measured transformed by the frequency converter into digital values by sampling by a common sampling signal, first and second high pass filters for removing direct-current components of output signals from the first and second A/D converters, a quadrature detector for detecting an in-phase signal representing its in-phase component and a quadrature signal representing its quadrature component, by detecting quadrature components of output signals from the first and second high pass filters, a phase detector for detecting the variation of phase determined by the in-phase signal and quadrature signal issued from the quadrature detector, and an evaluation calculator for calculating to evaluate a relative frequency stability of object signal to be measured with respect to reference signal by using the phase variation detected by the phase detector, wherein the phase detector is a phase detector for receiving in-phase signal I representing in-phase component and quadrature signal Q representing quadrature component of first signal and second signal respectively, and determining the variation of phase of the second signal with respect to the phase of the first signal, comprising;
a phase region detector which equally divides an angle range of 2 π
preliminarily, on virtual quadrature coordinates expressing the in-phase signal I and quadrature signal Q, into a plurality M of three or more of angle regions, sequentially assigns angle region numbers in each of the angle regions, detects the angle region corresponding to the variation of phase of the second signal starting from the phase of the first signal, and issues the angle region number assigned in the detected angle region,a phase displacement detector which issues a signal expressing the time change of the variation of the phase from the change corresponding to the time of the angle region number issued from the phase region detector, an out-of-bounds detector which receives a signal issued from the phase displacement detector, and issues an out-of-bounds signal including the out-of-bounds direction every time the variation amount of the phase exceeds a predetermined value on the quadrature coordinates, a phase rotation counter which issues the number of rotations of the phase on the quadrature coordinates by accumulating the out-of-bounds signals issued from the out-of-bounds detector, and a displacement accumulator which determines the cumulative value of phase displacement determined by the in-phase signal I and quadrature signal Q, based on the angle region number issued by the phase region detector, the number of angle regions, and the number of rotations of the phase issued by the phase rotation counter. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification