In this article, I will write about the different types of jitter.
I was not familiar with the word "Jitter" itself, but I like the song "JitterBug Love" by T.Rex (a British band).
”Jitter" is an English word meaning "irritating.
So I thought "JitterBug Love" meant "irritating bug love," but it was a dance called "Jitterbug..."
I'll get back on track.
To summarize the jitter is a deviation in the timing (or period) of a clock signal.
The unit is time, and it is generally expressed in the [ps] order in the datasheets of clock products.
Why does Jitter occur?
Causes include:
- Reflected waves
- Ground bounce
- Mixing of different frequencies within the same IC and between peripheral devices
- Supply voltage fluctuations
- Thermal noise
There are various types of Jitter depending on the measurement method.
In this article, we will introduce Jitter, which customers should pay attention to when selecting clock products.
Period Jitter:
This is the difference between the reference period and the actual clock waveform period.
Normally, a measurement of 10000 cycles or more is required.
Cycle-to-Cycle Jitter:
This is the difference between adjacent clock waveforms.
Normally, a measurement of 1000 cycles or more is required.
The two types of Jitter introduced here are called Timing Jitter, which is observed in the time domain.
There is also a Jitter that observed in the frequency domain, such as phase noise.
So, why should we pay attention to Jitter in the first place?
I will write about the reason in the next article.
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