Aerospace, Military & Defence
Radiation-tolerant GaN power architectures supporting adaptive SpaceVPX satellite computing platforms
By Maurizio Di Paolo Emilio, Efficient Power Conversion Corporation (EPC) S
atellite payload architectures are undergoing a transition from fixed- function processing chains toward flexible computing infrastructures capable of supporting dynamic workloads directly in orbit. This shift reflects a broader transformation in space systems engineering, where spacecraft are increasingly expected to perform signal processing, sensor fusion, anomaly detection, and artificial intelligence inference without relying exclusively on ground-based processing resources.
At the heart of this transition are adaptive compute platforms that are built on heterogeneous system-on-chip architectures that include programmable logic, scalar processors and vectorized AI engines. These devices will allow spacecraft subsystems to process more data locally and support mission reconfiguration post-launch. However, the advent of such computing density brings new constraints to power delivery architectures operating within the thermal, radiation and mechanical constraints of space-qualified electronic systems.
With increasing capability of adaptive onboard processing, the power subsystem is evolving from a supporting function to a primary enabling technology. In this respect, the development of radiation hardened gallium nitride (GaN) switching devices is becoming more and more important for the design of compact, efficient and scalable power architectures suitable for SpaceVPX computing platforms.
Power delivery challenges in modern spaceborne adaptive compute platforms
The move to adaptive computing devices is a fundamental change in spacecraft electrical requirements. Modern heterogeneous SoCs (System on Chips) operate at much lower core voltages than previous radiation- qualified processors, while demanding much
36 May 2026
Figure 1: RDS(on)
vs. VGS
for various temperatures and drain currents
higher current levels simultaneously. This combination increases stress on the voltage regulation subsystems that feed the digital processing fabrics.
In the past, spacecraft electronics utilized radiation-hardened processors that consumed relatively modest amounts of power and had predictable current profiles. In contrast, adaptive processing platforms designed to support programmable logic acceleration and onboard inference engines need tightly regulated low-voltage rails capable of supplying very large instantaneous currents. A single processing module can have core supplies that are hundreds of amperes.
Under these operating conditions, switching converters based on traditional silicon MOSFETs are limited by conduction losses, switching efficiencies and packaging limitations. These limitations are particularly apparent in SpaceVPX architectures, with high board-level integration density and tight thermal dissipation requirements. Thus, increasing the efficiency of power switching devices is a necessary pre-condition for the deployment of next-generation adaptive compute platforms in orbit.
Components in Electronics
Electrical advantages of GaN switching devices in space power architectures
Radiation hardened GaN switching devices have multiple electrical characteristics that directly address the limitations in high-current low-voltage power delivery for spaceborne computing systems. One of the key benefits of GaN technology is the lower drain-to-source on-resistance and overall lower switching losses when compared to silicon-based MOSFET devices designed for similar switching conditions. Reduced on- resistance lowers conduction losses of the high current converter stages, giving regulators improved efficiency even under heavy load conditions often encountered by adaptive processing devices. This improvement has implications which go far beyond the switching stage itself, since the efficiency of converters has a direct impact on thermal dissipation in sealed spacecraft electronic enclosures.
Another major advantage of GaN devices is their low gate charge. The reduction of gate charge causes a faster switching transition and less switching loss during
operation of the converter. This feature enables regulators to operate at higher switching frequencies without large efficiency penalties. In general, higher switching frequencies enable designers to scale down the size of inductors and capacitors used in voltage regulation stages. This allows the reduction of the size of passive components, leading to improved integration density at the board level and enabling the use of high current regulators in tight SpaceVPX form factors. The efficiency of operation at higher switching frequencies also improves the transient response performance. Adaptive processing devices typically have dynamic current consumption profiles for programmable logic activity and AI inference workloads. Voltage regulation stages based on GaN switching devices, however, are more suited to respond to these fast load transitions while maintaining the tight voltage regulation margins needed for reliable SoC operation. GaN-based regulators offer both improved efficiency and improved responsiveness compared to silicon-based alternatives by virtue of these electrical
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