Patent ID: 6909270
Filing Date: 2005-06-21
Classification: G01R

Abstract:
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 it preliminarily, on virtual quadrature coordinates expressing the in-phase signal I and quadrature signal Q, into a plurality M of three or more 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, wherein the phase region detector detects the angle region including the phase φ determined by the in-phase signal I and quadrature signal Q entered on the virtual quadrature coordinates, at every input timing of the in-phase signal I and quadrature signal Q, and issues angle region number p wherein the phase region detector is composed of a delay unit for delaying angle region number p wherein the 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 amount of the phase exceeds a predetermined value on the virtual quadrature coordinates, wherein the out-of-bounds detector identifies the region number difference issued from the phase displacement detector with any one of the ranges predetermined for the number M of angle regions, and issues data s wherein the out-of-bounds detector, when the number M of angle regions is an even number as the predetermined range, in the case of [M/2] being the maximum integer not exceeding M/2, issues data s issues data s issues data s