TIME INTERVAL MEASURING DEVICE AND JITTER MEASURING DEVICE
PROBLEM TO BE SOLVED: To accurately and stably measure the input interval time of pulse signal. SOLUTION: Sinusoidal reference signal r of a predetermined frequency is input to a phase shifter 22 to generate the first signal i and the second signal q shifted in phase. The signals are input to A/D co...
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| creator | SUGIYAMA OSAMU MOCHIZUKI TAKESHI NISHIOHARA MASANORI |
| description | PROBLEM TO BE SOLVED: To accurately and stably measure the input interval time of pulse signal. SOLUTION: Sinusoidal reference signal r of a predetermined frequency is input to a phase shifter 22 to generate the first signal i and the second signal q shifted in phase. The signals are input to A/D converters 23 and 24, respectively, and sampled at the input time of pulse signal p, and resulting sample values I and Q are input to an error correction part 25. The error correction part 25 corrects DC offset error, phase error to 90° and amplitude error which are caused in the sample values I and Q by the phase shifter 22 and the A/D converters 23 and 24, and an instantaneous phase calculation means 32 calculates an instantaneous phase of the reference signal at the pulse input time based on corrected samples values I' and Q', and an interval time calculation means 35 determines the input interval time of the pulse signal based on the change quantity of the calculated instantaneous phase. COPYRIGHT: (C)2007,JPO&INPIT |
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SOLUTION: Sinusoidal reference signal r of a predetermined frequency is input to a phase shifter 22 to generate the first signal i and the second signal q shifted in phase. The signals are input to A/D converters 23 and 24, respectively, and sampled at the input time of pulse signal p, and resulting sample values I and Q are input to an error correction part 25. The error correction part 25 corrects DC offset error, phase error to 90° and amplitude error which are caused in the sample values I and Q by the phase shifter 22 and the A/D converters 23 and 24, and an instantaneous phase calculation means 32 calculates an instantaneous phase of the reference signal at the pulse input time based on corrected samples values I' and Q', and an interval time calculation means 35 determines the input interval time of the pulse signal based on the change quantity of the calculated instantaneous phase. 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SOLUTION: Sinusoidal reference signal r of a predetermined frequency is input to a phase shifter 22 to generate the first signal i and the second signal q shifted in phase. The signals are input to A/D converters 23 and 24, respectively, and sampled at the input time of pulse signal p, and resulting sample values I and Q are input to an error correction part 25. The error correction part 25 corrects DC offset error, phase error to 90° and amplitude error which are caused in the sample values I and Q by the phase shifter 22 and the A/D converters 23 and 24, and an instantaneous phase calculation means 32 calculates an instantaneous phase of the reference signal at the pulse input time based on corrected samples values I' and Q', and an interval time calculation means 35 determines the input interval time of the pulse signal based on the change quantity of the calculated instantaneous phase. 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| subjects | MEASURING MEASURING ELECTRIC VARIABLES MEASURING MAGNETIC VARIABLES PHYSICS TESTING |
| title | TIME INTERVAL MEASURING DEVICE AND JITTER MEASURING DEVICE |
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