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公开(公告)号：US11356104B2
公开(公告)日：2022-06-07
申请号：US17351300
申请日：2021-06-18
发明人： Ryo Kuboshima
摘要： A phase locked loop circuit includes a phase comparator that compares phases of a reference signal through a first frequency divider and a local signal through a second frequency divider to output a phase comparison signal; a loop filter that smooths the phase comparison signal to output the control voltage signal; a controller that sets frequency division ratios of the first and the second frequency dividers; a free-running voltage generator that generates a free-running voltage signal of the voltage control oscillator; a measurement circuit that measures a voltage of the control voltage signal; a storage circuit that stores therein the voltage of the control voltage signal; and a low-pass filter that transmits, to the voltage control oscillator, a corrected free-running voltage signal based on a free-running voltage correction value calculated by the free-running voltage generator based on the control voltage signal before the frequency division ratios are changed.
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公开(公告)号：US20220006463A1
公开(公告)日：2022-01-06
申请号：US17351300
申请日：2021-06-18
发明人： Ryo Kuboshima
摘要： A phase locked loop circuit includes a phase comparator that compares phases of a reference signal through a first frequency divider and a local signal through a second frequency divider to output a phase comparison signal; a loop filter that smooths the phase comparison signal to output the control voltage signal; a controller that sets frequency division ratios of the first and the second frequency dividers; a free-running voltage generator that generates a free-running voltage signal of the voltage control oscillator; a measurement circuit that measures a voltage of the control voltage signal; a storage circuit that stores therein the voltage of the control voltage signal; and a low-pass filter that transmits, to the voltage control oscillator, a corrected free-running voltage signal based on a free-running voltage correction value calculated by the free-running voltage generator based on the control voltage signal before the frequency division ratios are changed.
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公开(公告)号：US10979261B2
公开(公告)日：2021-04-13
申请号：US16802618
申请日：2020-02-27
发明人： Ryo Kuboshima
IPC分类号： H04L27/00 , H04L27/152 , H04B1/12 , H04B17/20
摘要： A quadrature detector subjects a received signal to quadrature detection and outputs a base band signal. A direct current component measurement circuit measures a magnitude of a direct current component included in the base band signal from the quadrature detector. A first HPF and a second HPF reduce the direct current component included in the base band signal from the quadrature detector. A demodulator demodulates the base band signal output from the first HPF and the second HPF. A controller exercises control to attenuate a level of the received signal input to the quadrature detector when the magnitude of the direct current component measured by the direct current component measurement circuit is equal to or larger than a threshold value.
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