Aperture Jitter Measurement

Measure aperture jitter of periodic signals

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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

clk — Clock signal input

scalar

Clock signal input, specified as a scalar in volts.

Data Types: double

Output

jitter — Jitter output

scalar

Aperture jitter output, returned as a scalar in seconds.

Data Types: double

Parameters

Frequency — Input clock frequency

1e6 (default) | real positive scalar

Input clock frequency, specified as a real positive scalar in Hz.

Programmatic Use

• Use get_param(gcb,'Frequency') to view the current value of Frequency.

• Use set_param(gcb,'Frequency',value) to set Frequency to a specific value.

Recommended min. simulation stop time — Minimum time the simulation must run for meaningful result

9.901e-05 (default) | scalar

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

Signal range

Min — Minimum value of clock signal

0 (default) | real scalar

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

Programmatic Use

• Use get_param(gcb,'InputMin') to view the current value of Min.

• Use set_param(gcb,'InputMin',value) to set Min to a specific value.

Max — Maximum value of clock signal

1 (default) | real scalar

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

Programmatic Use

• Use get_param(gcb,'InputMax') to view the current value of Max.

• Use set_param(gcb,'InputMax',value) to set Max to a specific value.

Hold off time (s) — Delay before measurement analysis

0 (default) | nonnegative real scalar

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

Programmatic Use

• Use get_param(gcb,'HoldOffTime') to view the current value of Hold off time (s).

• Use set_param(gcb,'HoldOffTime',value) to set Hold off time (s) to a specific value.

Data Types: double

Version History

Introduced in R2019a