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Clock Signal Jitter Simulation 1.0

  Date Added: June 22, 2013  |  Visits: 338

Clock Signal Jitter Simulation

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This function creates a user definable digital clock signal waveform with random jitter on it. This function can be used to generate waveform data that can be uploaded onto an arbitrary waveform generator (AWG) to simulate a real world digital clock with a known amount of jitter for noise immunity and other similar test applications. The random jitter is genrated using matlab's rand function. You can choose two different distributions for generating the random values: normal and uniform. For the normal distribution jitter Magnitude variable is used as the 3 sigma point which covers 99.7% of the area of the distribution. This funtion uses Matlab's built-in error function or erf() function. For information on theerf() function http://www.mathworks.com/help/techdoc/ref/erf.html. For more information or questions on the technique and math used in this function to simulate real world jitter refer to my blog post:http://gpete-neil.blogspot.com/2011/08/sim...-with-arbitrary.html or email me at: neil_forcier at agilent dot com. The following is a description of the input arguments and returned variables.sRate: The sample rate of the waveform points. This value should be samesample rate you plan to use with the AWGsCount: the number of points needed in one clock cyclecCycles: the number of clock cycles you want in the waveform. cCycles *sCount gives you the number of points in the waveformjMag: is the maximum value in seconds that the signal should vary +/- fromthe ideal value. It is used to set the limits of the uniform distributionand the 3 sigma point of the normal distribution. jMag must be less thanor equal to 80 percent of the pulse width or one half cycle period.Otherwise it will be set to 80 percent.dist: Used to specify the type of distribution to be used by the random()function. There are two distributions normal and uniform.-->to select normal distribution enter string 'normal' or 'norm'-->to select uniform distribution enter string 'uniform'-->the default distribution is normalampl: This is the returned array of digital clock waveform amplitudepoints. In terms of a plot this would be the y axis pointstime: This is the array of the timing points that correspond to the arrayof amplitude points. Some AWGs use the timing points to set their samplerate. Most AWGs do not require the timing points and the sample rate canbe set manually on the front panel or remotely with a command

Requirements: No special requirements
Platforms: Matlab
Keyword: Clock Jitter Scripts Signal Simulation
Users rating: 0/10

License: Shareware Size: 10 KB
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