Feature: Clock and timing electronics


Figures 2: Precise synchronisation reduces time uncertainty across distributed infrastructure, enabling AI clusters, cloud platforms and communications networks to operate as a coordinated system


increasingly diverse set of processors, accelerators, memory devices and high- speed interfaces while satisfying the unique frequency, voltage, jitter and power requirements of each domain. Achieving this balance requires a timing architecture that is scalable, flexible and capable of maintaining synchronisation across a broad range of operating conditions. Modern clock generators play a central


role in addressing this challenge. Advanced devices can generate multiple independent output frequencies from a common timing source, simultaneously supporting CPU and GPU reference clocks, PCI Express and CXL fabrics, Ethernet timing references and high-speed SerDes channels. Each output can be independently configured to optimise frequency, voltage levels, signal format and spread-spectrum behaviour whilst maintaining a coherent timing relationship across the system. One of the most important performance


metrics in these architectures is output-to- output skew. When multiple subsystems derive their clocks from a common timing source, any fixed timing offset between outputs establishes a corresponding phase relationship between the domains they drive. As data rates increase and timing margins shrink, excessive skew can directly impact synchronisation accuracy, data transfer timing and overall system performance. Minimising output-to- output skew has therefore become a key architectural objective in tightly-coupled heterogeneous compute systems. Te most


advanced clock generation architectures achieve this through highly optimised signal paths, low-noise multiplexing structures and sophisticated calibration techniques that maintain precise timing alignment across all outputs.


Programmability is essential As system architectures continue to evolve, timing requirements are becoming increasingly dynamic. Fixed-frequency oscillators and clock generators, whose operating characteristics are permanently defined during manufacturing, are no longer sufficient for many modern platforms. AI training infrastructure, GPU accelerator baseboards, advanced driver assistance systems and next-generation 5G and 6G networking equipment all demand greater flexibility to accommodate rapidly changing performance, interface and deployment requirements. Te challenge is not simply supporting


multiple clock frequencies. Modern systems frequently require different timing configurations across product variants, deployment environments and operating modes. As a result, programmability has become a fundamental requirement of timing architectures rather than a convenience feature. Programmable timing devices provide


the flexibility to configure output frequency, signal format, voltage swing and spread-spectrum characteristics to match the requirements of each subsystem. Tis capability is particularly important in


24 November 2026 www.electronicsworld.co.uk


complex SoCs, FPGAs and heterogeneous compute platforms, where processors depend on stable reference clocks during power-up and initialisation sequences. Integrated one-time programmable memory allows timing devices to automatically generate the required frequencies and output characteristics immediately at start-up, eliminating the need for processor intervention and ensuring deterministic system bring-up. At the same time, unused outputs can be disabled to reduce power consumption and minimise system-level noise. Modern timing devices extend


this flexibility even further through embedded non-volatile memory that supports multiple preconfigured operating profiles within a single device. A clock generator can store numerous independent timing configurations, each defining unique combinations of output frequencies, voltage levels and spread- spectrum settings. Tese profiles can be selected during manufacturing, system initialisation, or runtime operation, allowing a single timing device to support multiple platform configurations without requiring hardware modifications. Tis flexibility delivers benefits that


extend well beyond the timing subsystem itself. As system vendors seek to reduce design complexity and accelerate product development cycles, hardware consolidation has become a strategic objective. A single programmable clock generator can support multiple product


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