학술논문
High-Precision Time Interval Measurement Based on Triggerable Ring Oscillators and All-Phase FFT Algorithm
Document Type
Conference
Source
2019 Joint Conference of the IEEE International Frequency Control Symposium and European Frequency and Time Forum (EFTF/IFC) Frequency Control Symposium and European Frequency and Time Forum (EFTF/IFC), 2019 Joint Conference of the IEEE International. :1-2 Apr, 2019
Subject
Language
ISSN
2327-1949
Abstract
We present a novel time interval measurement method that utilizes a ring oscillator circuit triggered by the short pulse representing an event to generate a clock signal synchronous with the event, which is used as the sampling clock of ADC to sample a sinusoidal reference signal. The time interval between the two events is mapped to the initial phase difference between the two points on the sinusoidal reference signal. An all-phase FFT algorithm is subsequently performed to accurately determine the time interval between the two events. We have achieved the singleshot time interval measurement precision of 0.9ps rms.