Title:
位相測定装置、および周波数測定装置
Document Type and Number:
Japanese Patent JP5559142
Kind Code:
B2
Abstract:
A frequency measuring device is disclosed, comprising: a buffer delay amount measuring circuit 610 including a plurality of buffers for being inputted with clock signals that are synchronized with a reference signal calculated by positioning calculation, at different timings shifted by a fixed delay time, respectively, and being simultaneously inputted with a sampling reference signal of a lower frequency than the clock signals, and respectively generating state data according to levels of the clock signals at a transition timing of the sampling reference signal, wherein the buffer delay amount measuring circuit outputs delay measurement data comprised of a group of the state data from the plurality of buffers; a frequency measuring circuit 620 including a plurality of buffers for being inputted with third measuring signals at different timings shifted by a fixed delay time, respectively, being simultaneously inputted with a sampling reference signal of a lower frequency than the third measuring signals, and respectively generating state data according to levels of the third measuring signals at a transition timing of the sampling reference signal, wherein the frequency measuring circuit outputs the frequency measurement data comprised of a group of the state data from the plurality of buffers; and a frequency calculator 62 for calculating the delay amount between the buffers based on the delay measurement data, and calculating a frequency or a cycle of the third measuring signals based on the frequency measurement data and the delay amount.
Inventors:
Kazunori Miyahara
Application Number:
JP2011501675A
Publication Date:
July 23, 2014
Filing Date:
February 26, 2010
Export Citation:
Assignee:
FURUNO ELECTRIC CO., LTD.
International Classes:
G01R25/00; G01R23/10
Domestic Patent References:
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| JP2001059863A | 2001-03-06 | |||
| JPH0854481A | 1996-02-27 | |||
| JPS5985963A | 1984-05-18 | |||
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| JPH0651003A | 1994-02-25 | |||
| JP2001059863A | 2001-03-06 | |||
| JPH0854481A | 1996-02-27 | |||
| JPS5985963A | 1984-05-18 |