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Clock Phase Separation Method Triggered by Phase-locked Loop Clock Edge
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A clock edge and phase-locked loop technology, applied in the direction of automatic power control, electrical components, etc., can solve the problems of high system operating frequency, low resolution, low performance, etc., to achieve lower system operating frequency, high resolution, lower The effect of operating frequency
Active Publication Date: 2022-04-12
HARBIN INST OF TECH
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[0015] The purpose of the present invention is to solve the problems of low resolution, high systemoperating frequency and low performance of the existing clock phasing method, and provide a clock phasing method triggered by the clock edge of the phase-locked loop
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specific Embodiment approach 1
[0033] Specific implementation mode one: the phase-splitting clock method triggered by the phase-locked loop clock edge described in this implementation mode, the specific process is:
[0034] Step 1, input the clock signal 100MHz to the input terminal of the phase-locked loop;
[0035] Step 2. Multiply the clock signal from 100MHz to 315MHz, shift the phase of the high-level segment of the input clock eight times, and set the phase shift angles CLK[0]~CLK[7] to 0°, 22.5°, and 45° respectively , 66.5°, 90°, 112.5°, 135°, 157.5°;
[0036] Step 3, using the edges of the eight-way clock signals after the phase-locked loop frequency multiplication and phase shifting as sixteen trigger signals;
[0038] Step 5, performing timing constraints on each transmission path of the clock signal and the signal under test;
[0039] Step 6. Determine whether the measured signal levels Count[0]~Count[15] at ...
specific Embodiment approach 2
[0043] Embodiment 2: In this embodiment, Embodiment 1 is further described. The edges of the eight-way clock signals in step 3 include rising edges and falling edges of the eight-way clock signals.
specific Embodiment approach 3
[0044] Specific implementation mode three: this implementation mode further explains the first implementation mode, and the method for extracting the positions where 0→1 transition and 1→0 transition occur in Count[0]~Count[15] described in step 5 is:
[0045] Calculate Count[n] and Count[n+1]:
[0046] When event_up[n]=(~Count[n])&Count[n+1] occurs, it is the position where 0→1 jumps;
[0047] When event_down[n]=(~Count[n+1])&Count[n] occurs, it is the position of 1→0 transition;
[0048] Among them, n=0,1,...,15.
[0049] The present invention proposes a precision time interval measurement method based on FPGA, which divides the time interval measurement into two parts: "coarse" measurement and "fine" measurement. It relies on the clock phase division method to perform time interpolation, so as to obtain higher time resolution.
[0050] The most basic method in the traditional time interval measurement technology is the pulse counting method. The pulse in the pulse count...
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Abstract
The clock phase separation method triggered by the edge of the phase locked loopclock belongs to the field of time interval measurement. The invention solves the problems of low resolution, high systemoperating frequency and low performance of the existing clock phase separation method. The specific process of the present invention is as follows: input the clock signal 100MHz to the input end of the phase-locked loop; multiply the frequency of the clock signal to 315MHz, and perform eight times of phase-shifting on the high-level segment; The edge of the measured signal is used as the trigger signal; the measured signal is clock-synchronized; the clock signal and each transmission path of the measured signal are respectively time-sequentially constrained; the position where the measured signal level jumps at the trigger time is extracted; The rising edge detection function of the measured signal or the falling edge detection function of the measured signal outputs a high level when there is a rising edge, otherwise it outputs a low level; obtain the relative position of the rising edge or falling edge of the measured signal within one clock cycle. The invention is used for time interval measurement.
Description
technical field [0001] The invention relates to a time interval measurement method, which belongs to the field of time interval measurement. Background technique [0002] Time is one of the fundamental units of physics. We usually refer to time in two senses: one meaning refers to moments, and the other refers to time intervals. Moment refers to a certain instant of time that passes continuously, and it refers to when an event occurs; while time interval refers to how long the interval between two instants is, and it refers to the duration of an event. [0003] Precise time, as a basic physical parameter in scientific research, scientific experiments and engineering technology, provides an essential time-base coordinate for the measurement and quantitative research of all dynamical systems and time series processes. Precise time not only plays an important role in basic research fields such as nuclear physics research, particle physics research, geodynamics research, relat...
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