eyePeakToPeakJitter

eyePeakToPeakJitter(
o_eyeDiagram
f_threshold
n_eyeStart
n_eyeEnd
)
=> x_p2pJitter / nil

Description

Calculates the peak-to-peak jitter at the specified threshold within the region of an eye diagram. The peak-to-peak jitter is the time between the first and the last crossing.

Arguments

o_eyeDiagram	Waveform object for the eye diagram
f_threshold	Crossing threshold at which the peak-to-peak jitter is calculated
n_eyeStart	Start time of the crossing
n_eyeEnd	End time of the crossing

Value Returned

x_p2pJitter	Peak-to-peak jitter at the specified threshold within the region of an eye diagram.
nil	Peak-to-peak jitter cannot be calculated because of an error.

Examples

The following example calculates the peak-to-peak jitter at the threshold value 0 for the eye diagram represented by the waveform object, eye.

openResults("./simulation/PAM3_Eye_Diagram/pam3_testbench/maestro/results/maestro/Interactive.13/psf/PAM3_Eye_Diagram_pam3_testbench_1/psf")

;Opens the simulation results stored in the specified directory.

=> "./simulation/PAM3_Eye_Diagram/pam3_testbench/maestro/results/maestro/Interactive.13/psf/PAM3_Eye_Diagram_pam3_testbench_1/psf"

results()

;Lists the results available in the specified results directory.

=> tran(tranOp model instance output designParamVals

    primitives subckts variables

)

selectResults('tran)

;Selects the result tran from the list of available results

=> stdobj@0x3945fc50

outputs();

;Lists the outputs available in the selected result tran.

=> ("/out1" "V0.p" "/in1")

Vout=v("/out1")

;Created a waveform object Vout representing the waveform of the voltage signal for output out1.

=> srrWave:0x3e1ce020

awvCreatePlotWindow()

;Creates a Waveform window and returns its window ID

=> window:3

vvSetGraphBackground("#ffffff" awvGetCurrentWindow())

;Sets the background color of the current Waveform window to White.

=> (("graphWindow[1.1.1]") 

    (("viva.graphFrame.background" "#ffffff"))

)

eye=leafValue( eyeDiagram(Vout 0.0 1e-07 (2 * 1e-10) ?triggerPeriod 1e-10 ?autoCenter t) "trise1" "0.05*myUI" )

;Craetes a waveform object eye, representing the eye diagram created by applying eyeDiagram function on the Vout signal.

=> srrWave:0x3e1ce030

awvPlotWaveform(

    window(3)

    list(eye)

    ?expr list("eyeDiagram")

    ?color list("y6")

    ?index list(1)

    )

;Plots the waveforms eye in the specified Waveform window.

=> t

eyePeakToPeakJitter(eye -490.8m 0 100p)

; Calculates the distance between the first (0p) and last crossing (100p)at the threshold value -490.8mV of the eye diagram represented by the waveform object, eye.

=> 1.844226e-11

The calculated value of peak-to-peak jitter can be verified by placing the A and B markers on the first and last crossing at the threshold value of -490.8mV. The distance between these two markers is 18.4ps.

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