The FPGA Advantage in Mission-Critical Design

In safety-critical environments, such as the medical, defense or aerospace industries, system failure is unacceptable. When developing a Class III medical device or a flight control system, there is no room for error. The goal is to engineer the product right the first time because high quality and functional safety are mandatory prerequisites, not afterthoughts.

Traditionally, engineers had to choose between the speed of a microprocessor and the raw power of a custom application-specific integrated circuit, or ASIC. But as system requirements for real-time data and decentralized intelligence skyrocket, that middle ground — the field-programmable gate array, or FPGA — has become the undisputed nexus for innovation.

At Plexus, we have observed a foundational shift: The most successful mission-critical products are not just built on fixed hardware; they are built on adaptive logic that behaves as fixed hardware. It is not software; it is configurable hardware. However, developing adaptive computing hardware can add complexity to your product development roadmap. Choosing the right partner to navigate this complexity can make the difference in bringing your next-generation technology to market.

Why use an FPGA over a microcontroller?

The shift toward field programmable gate arrays in product design is driven by three pillars: parallelism, determinism and longevity.

Unlike a microcontroller unit (MCU) that executes instructions sequentially, an FPGA can perform thousands of operations simultaneously. This massive parallelism is essential for high-bandwidth applications like real-time image processing in surgery or signal intelligence in defense.

Furthermore, FPGAs provide hardware-level determinism. In a mission-critical system, a response that arrives a millisecond late is a failure. Because FPGAs do not rely on an operating system to manage resources, they offer guaranteed execution timing.

Finally, FPGAs offer a unique solution to navigate design changes. While an ASIC may require a total redesign if a component becomes obsolete or regulations change, FPGA logic can often be migrated to newer chips with minimal changes, extending a product’s life cycle by decades.

Navigating the complexity gap

The very flexibility that makes FPGAs powerful also makes their design and verification significantly more complex than traditional software-based systems. As devices grow in density, now containing millions of logic cells, the engineering challenges scale exponentially.

Designers must navigate timing closure, ensuring that signals move across the chip fast enough to meet strict clock requirements. They must also manage metastability and routing congestion, where thousands of internal connections compete for limited physical space on the silicon.

Perhaps most critically, these designs must be guaranteed to work across all process, voltage and temperature (PVT) corners. A system that works on a lab bench at 25 degrees Celsius may fail in the cockpit of a jet at minus 40 degrees or in the high-heat environment of an industrial power plant. This is where specialized engineering services become a necessity. Without a rigorous, hardware-centric verification process, latent bugs can remain hidden until the product is already in the field.

Concept to compliance: The Plexus partnership

At Plexus, our approach to FPGA design services is rooted in the belief that we do not just write code; we architect hardware. We bridge the gap between abstract requirements and reliable silicon.

For customers in highly regulated markets, the how is just as important as the what. We align our development processes with strict regulatory standards, including IEC 62304 for medical software (and its hardware counterparts) and DO-254 compliance for airborne electronic hardware.

To ensure reliability, we utilize advanced verification methodologies like the Universal Verification Methodology (UVM). This allows our teams to perform constrained-random testing, which can simulate millions of scenarios to find the edge cases that traditional manual testing would miss.

We also leverage our deep design experience to bring products to market faster. By leveraging internally developed, validated reference designs, we accelerate your product development roadmap, ensuring we are refining proven solutions rather than reinventing the wheel.

Real-world impact: Adaptive FPGA logic in action

Plexus has worked with dozens of global original equipment manufacturers (OEMs) to bring FPGA technology to their end users. These examples illustrate how adaptive hardware solves real-world challenges:

• Medical Imaging: We transformed a heavy, analog-based diagnostic system into a digital powerhouse using Intel Cyclone FPGAs. This resulted in a 10-times increase in signal capacity and a 30-year operational life for the product.
• Surgical Energy: For a leading MedTech firm, we utilized Xilinx Zynq UltraScale+ systems-on-a-chip to synthesize complex waveforms for surgical generators, assisting in more than 70 million procedures annually.
• Aerospace Modernization: We used FPGAs as a logic bridge to save a legacy platform from obsolescence, extending its life by 30 years without a total, and expensive, redesign.

The future is adaptive

The companies that win in their markets will be those that leverage adaptive hardware to iterate faster without sacrificing reliability. FPGAs provide the agility of software with the performance of dedicated hardware, making them the ideal choice for the next generation of mission-critical systems.

Engineering the product right the first time in this space requires more than just a data sheet. It requires a partner with the engineering services depth to handle signal integrity, hardware cybersecurity and rigorous verification. At Plexus, we provide that expertise to ensure your mission-critical system doesn’t just work; it leads the market.