Table of Contents
How do you reduce jitter in a circuit?
Decreasing the jitter of the system clock circuit can be achieved in many ways, including improving the clock source, as discussed, as well as filtering, frequency division, and proper choice of clock circuit hardware.
What causes jitter in VLSI?
It can be defined as “deviation of a clock edge from its ideal location.” Clock jitter is typically caused by clock generator circuitry, noise, power supply variations, interference from nearby circuitry etc. Jitter is a contributing factor to the design margin specified for timing closure.
What is jitter VLSI?
Jitter: Jitter is the short term variations of a signal with respect to its ideal position in time. It is the variation of the clock period from edge to edge.it can vary +/- jitter value. From cycle to cycle the period and duty cycle can change slightly due to the clock generation circuitry.
How jitter affects setup and hold?
Jitter is basically time variation of periodic signal. Jitter will not effect the hold requirement if the capture and launch flop clock is derived out of same same PLL. Basically they gets cancelled off..
How do you stop the jitter in PLL?
Reducing the LF bandwidth increases the amount of jitter attenuation on the reference clock, transferring less jitter from the input to the output. If the reference clock has a significant amount of jitter, the typical remedy is to use a low PLL bandwidth to filter this noise.
What causes signal jitter?
In electronics and telecommunications, jitter is the deviation from true periodicity of a presumably periodic signal, often in relation to a reference clock signal. Jitter may be caused by electromagnetic interference and crosstalk with carriers of other signals.
What is jitter explain with examples?
Jitter, in networking, refers to small intermittent delays during data transfers. Network jitter causes packets to be sent at irregular intervals. For example, there may be a delay after some packets are sent and then several packets may be sent all at once.
Why is jitter important?
Jitter is an important and widely used metric when diagnosing quality problems with real-time communications sessions. High jitter values contribute to poor audio quality, which can degrade customer experiences and prevent call center agents from communicating effectively.
Why is jitter not in hold?
Re: Why hold is not affected be jitter? Because jitter is based on different edges of the clock and hold is analyzed on the same edge of the clock.
Why is uncertainty added in hold time?
hold time always less than setup time at synthesis stage, more concern on reduce path timing, so setup uncertainty is more important to add margin to design. hold is easy fix, so less important, when do timing check, you should set a more consertive hold uncertainty .
What is jitter in PLL?
Li short, jitter is a statistical measure of the deviation of the actual PLL clock edges from an ideal clock edges. Non-idealities causing jitter include supply and substrate noise, transistor device noise (mainly thermal and flicker noise), and jitter in the reference signal.
What is deterministic jitter?
Deterministic jitter is defined as jitter that is bounded, with a well-defined minimum and maximum extent. This is in contrast to random jitter, which is Gaussian in nature, and is unbounded. There are a variety of deterministic data sources, including data-dependent jitter (DDj) and periodic jitter (Pj).