Note: Low phase noise programmable phase-locked loop with high temperature stability

Area of Science:

• Electrical Engineering
• Physics
• Instrumentation

Background:

• High-precision timing is critical for applications such as event timers and scientific instrumentation.
• Existing timing solutions often face limitations in jitter, phase stability, and programmability.
• The need for clock sources with subpicosecond precision and low phase temperature coefficients is increasing.

Purpose of the Study:

• To design and construct a programmable phase-locked loop (PLL) with exceptionally low jitter.
• To achieve a low temperature coefficient of phase for enhanced stability.
• To develop a clock source suitable for demanding high-precision timing applications, particularly event timers.

Main Methods:

• Implementation of a novel PLL architecture focusing on jitter reduction.
• Integration of a temperature compensation mechanism for phase stability.
• Design for programmable output frequency (100 MHz–500 MHz) and amplitude (0.25 V–1.2 Vpp).
• Inclusion of an on-board temperature-compensated crystal oscillator for standalone operation.

Main Results:

• The designed PLL exhibits jitter in the few hundreds of femtoseconds range.
• The device offers programmable output frequencies from 100 MHz to 500 MHz and amplitudes from 0.25 V to 1.2 Vpp.
• A low temperature coefficient of phase lock (0.9 ps/K near room temperature) was achieved.
• The PLL can be locked to standard reference frequencies (5 MHz or 10 MHz) or operate standalone.

Conclusions:

• The developed programmable PLL meets the stringent requirements for high-precision timing applications.
• Its low jitter and stable phase performance are suitable for subpicosecond precision event timers.
• The integrated features, including temperature compensation and standalone capability, enhance its versatility.