A simple Field Programmable Gate Array (FPGA) based high precision low-jitter delay generator.

Area of Science:

• Electronics and Electrical Engineering
• Instrumentation and Measurement

Background:

• Pulse delay generators are essential laboratory tools for synchronizing scientific instruments.
• High precision and low jitter are critical performance metrics for these devices.

Purpose of the Study:

• To introduce a new digital delay generator design based on Field Programmable Gate Array (FPGA) technology.
• To achieve high precision and low jitter for improved experimental accuracy.

Main Methods:

• Utilized an FPGA for generating coarse delays (4.2 ns steps) and fine delays (16 ps steps).
• Integrated a time-to-digital conversion unit for precise interval measurement.
• Implemented a jitter compensation mechanism through a measurement-and-feedback module.
• Developed a computer interface controlled by a Nios II processor.

Main Results:

• Achieved a time resolution of 16 ± 2 ps.
• Measured jitter below 450 ± 20 ps at 24°C.
• Demonstrated a maximum delay capability of 1 second.
• The system exhibits a simple structure and low cost.

Conclusions:

• The developed FPGA-based digital delay generator meets the requirements for high precision and low jitter in laboratory applications.
• The design offers a cost-effective and structurally simple solution for timing control in scientific instruments.