Aperture Jitter Measurement

Measure aperture jitter of periodic signals

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  • Aperture Jitter Measurement block

Libraries:
Mixed-Signal Blockset / ADC / Measurements & Testbenches

Description

The Aperture Jitter Measurement measure the aperture jitter of periodic signals. In practical data converters, there is a delay between the sampling edge of the sample clock signal and when the sample is actually taken. This delay is known as aperture delay. Aperture jitter is the sample to sample variation between aperture delay.

Ports

Input

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Clock signal input, specified as a scalar in volts.

Data Types: double

Output

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Aperture jitter output, returned as a scalar in seconds.

Data Types: double

Parameters

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Select the jitter metric you want to measure, specified as RMS Aperture Jitter or RMS Period Jitter.

Programmatic Use

Block parameter: JitterMetrick
Type: character vector
Values: RMS Aperture Jitter | RMS Period Jitter
Default: RMS Aperture Jitter

Select this parameter to enable the use external reference signal against which to measure aperture jitter. By default, this option is cleared.

Dependencies

To enable this parameter, set Jitter Metric to RMS Aperture Jitter.

Programmatic Use

Block parameter: ExternalReference
Type: character vector
Values: off | on
Default: off

Minimum value of clock signal, specified as a real scalar in volts.

Dependencies

To enable this parameter, set the Jitter Metric parameter to RMS Aperture Jitter and select the Use external reference signal parameter.

Programmatic Use

Block parameter: InputMin
Type: character vector
Values: real scalar
Default: 0

Maximum value of clock signal, specified as a real scalar in volts.

Dependencies

To enable this parameter, set the Jitter Metric parameter to RMS Aperture Jitter and select the Use external reference signal parameter.

Programmatic Use

Block parameter: InputMax
Type: character vector
Values: real scalar
Default: 1

Average frequency of the input clock signal, specified as a real positive scalar in Hz.

Dependencies

To enable this parameter:

  • Either set the Jitter Metric parameter to RMS Aperture Jitter and clear the Use external reference signal parameter.

  • Or set the Jitter Metric parameter to RMS Period Jitter.

Programmatic Use

Block parameter: Frequency
Type: character vector
Values: real positive scalar
Default: 1e6

Phase of the input clock signal, specified as a real scalar in seconds.

Dependencies

To enable this parameter, set the Jitter Metric parameter to RMS Aperture Jitter and clear the Use external reference signal parameter.

Programmatic Use

Block parameter: Phase
Type: character vector
Values: real scalar
Default: 0

Select this parameter to specify the window length of the moving average to compensate for the effects of a static frequency offset. By default, this option is cleared.

Dependencies

To enable this parameter, set Jitter Metric to RMS Aperture Jitter.

Programmatic Use

Block parameter: SpecifyWindowLength
Type: character vector
Values: off | on
Default: off

Window length of the moving average to compensate for the effects of a static frequency offset, specified as a positive real integer.

Dependencies

To enable this parameter, set the Jitter Metric parameter to RMS Aperture Jitter and select the Specify window length parameter.

Programmatic Use

Block parameter: WindowLength
Type: character vector
Values: positive real integer
Default: 1000

Delays measurement analysis to avoid corruption by transients, specified as a nonnegative real scalar in seconds.

Programmatic Use

Block parameter: HoldOffTime
Type: character vector
Values: nonnegative real scalar
Default: 0

This parameter is read-only.

Minimum time the simulation must run for meaningful result, returned as a scalar in seconds. This is calculated using the JEDEC Standards for measuring aperture jitter.

Version History

Introduced in R2019a

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See Also

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