Pulsed Illumination Synchronization for Global Reset Rolling Shutter Imagers
Global Reset rolling shutter imagers eliminate motion blur when pulsed light fires strictly within the dark global integration window under controlled ambient light.
Jitter Budget
Temporal Allocation
The total allowable variation in the timing of a system clock or trigger signal across multiple electronic and optical components represents a primary design constraint for synchronous measurement networks. This defined limit, known as a jitter budget, divides the permissible timing uncertainty among the individual subsystems, including oscillators, cables and driver circuits. Designers allocate specific portions of the total margin to each component to ensure that the cumulative timing error does not exceed the receiver tolerance.
It guarantees that the system maintains phase lock or exposure alignment under all operating conditions.
Component Distribution
Component selection is directly guided by this allocation process. High-performance oscillators receive a smaller share of the jitter budget because their low intrinsic phase noise can be verified through rigorous laboratory testing. Conversely, passive cables and connectors are allocated a larger portion due to environmental factors such as temperature changes and physical bending.
This division ensures cost-effective system design without compromising timing stability.
Measurement Integrity
Exceeding the allocated timing limits leads to critical data errors and reduced measurement accuracy. In optical sensing networks, excessive jitter causes trigger uncertainty that manifests as amplitude noise in the sampled data. Trigger timing must remain stable to prevent misalignment between the illumination pulse and the sensor shutter.
The system tolerance is typically verified during production testing under worst-case thermal and electrical conditions.
Verification Method
Metrological validation of the timing margin requires high-bandwidth oscilloscopes. Test engineers measure the cycle-to-cycle jitter to confirm that each subsystem operates within its limits. Adjustments to the clock distribution network are made if the measured values approach the boundary.
A documented margin ensures long-term reliability in the field.