Lock Time Measurement

Measure time a PLL takes to reach target frequency within given tolerance

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

Description

The Lock Time Measurement block measures the lock time of a phase-locked loop (PLL) system. Lock time is the time required by the PLL to reach the target frequency within the given error tolerance.

Ports

Input

pll out — Input clock signal

scalar

Input clock signal to the Lock Time Measurement block, specified as a scalar. The pll out port is connected to the output of a PLL system.

Data Types: double

Output

lock time — Time required to achieve lock in PLL

real positive scalar

Time at which locking takes place in a PLL system, returned as a real positive scalar in seconds.

Data Types: double

Parameters

Target frequency (Hz) — Target operating frequency of PLL to measure lock time

2.1e9 (default) | real positive scalar

Target operating frequency of the PLL device under test (DUT) to measure the lock time of the PLL, specified as a real positive scalar in Hz.

Programmatic Use

• Use get_param(gcb,'TargetFreq') to view the current value of Target frequency.

• Use set_param(gcb,'TargetFreq',value) to set Target frequency to a specific value.

Error tolerance (Hz) — Error tolerance for lock time measurement

1e5 (default) | real positive scalar

Error tolerance for lock time measurement, specified as a real positive scalar in Hz.

Programmatic Use

• Use get_param(gcb,'FreqErrorTol') to view the current value of Error tolerance.

• Use set_param(gcb,'FreqErrorTol',value) to set Error tolerance to a specific value.

Version History

Introduced in R2019a