Adds random and deterministic jitter to the output signal
Keywords
electrical, unidirectional
Ports
Name | Type |
---|---|
input | Electrical Signal |
output | Electrical Signal |
Properties
General Properties
Name | Default value | Default unit | Range |
---|---|---|---|
name Defines the name of the element. |
Jitter Source | - | - |
annotate Defines whether or not to display annotations on the schematic editor. |
true | - | [true, false] |
enabled Defines whether or not the element is enabled. |
true | - | [true, false] |
type Defines the element unique type (read only). |
Jitter Source | - | - |
description A brief description of the elements functionality. |
Adds random and deterministic jitter to the output signal | - | - |
prefix Defines the element name prefix. |
JITTER | - | - |
model Defines the element model name. |
- | - | - |
library Defines the element location or source in the library (custom or design kit). |
- | - | - |
local path Defines the local path or working folder $LOCAL for the element. |
- | - | - |
url An optional URL address pointing to the element online help. |
- | - | - |
Standard Properties
Name | Default value | Default unit | Range |
---|---|---|---|
period For a digital signal, the time value equivalent to one bit period. |
1.0 / %bitrate% | s | (0, +∞) |
jitter frequency The jitter frequency, typically a sub-rate of the clock frequency. |
0.1 * %bitrate% | Hz | (0, +∞) |
deterministic jitter The level of deterministic jitter as a fraction of one period. The deterministic jitter has a sinusoidal form. |
0 | UI | [0, 1] |
random jitter The level of jitter, as a fraction of the period, that is not bounded and described by a Gaussian probability distribution. |
0 | UI | [0, 1] |
Numerical Properties
Name | Default value | Default unit | Range |
---|---|---|---|
automatic seed Defines whether or not to automatically create an unique seed value for each instance of this element. The seed will be the same for each simulation run. |
true | - | [true, false] |
seed The value of the seed for the random number generator. A value zero recreates an unique seed for each simulation run. |
1 | - | [0, +∞) |
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Implementation Details
Jitter is the variation of the true periodicity to a presumed periodic signal. The Jitter Source element adds deterministic and/or random jitter to the output signal. Please see the example file jitter_source.icp for the detailed performance of this element. The following figure shows the system in the example file:
There are two types of jitter modeled in this element; the random jitter, also known as the Gaussian jitter, which is the unpredictable time noise; the deterministic jitter, which is predictable and reproducible. The total jitter is the combination of these two. The setting of the deterministic jitter and the random jitter is the level of the jitter as a fraction of one jitter period, which take the value in the range [0, 1]. The effects of these two types of jitter and the combination effect are shown in the following figures, the figures measure the eye diagram of the system in the example.
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