Designing electronics for space applications requires far more than performance. It demands high reliability, controlled processes, qualification testing, and risk mitigation strategies from concept to industrialization.
This RF design project was developed within the framework of the SIPHODIAS program and includes high-speed optical transceivers, FPGA-based processing systems, controlled impedance PCB layout, radiation validation, and full design industrialization.
High-Speed RF Design: 56Gbps Optical Transceiver Evaluation Board
At the core of this development is a four-channel high-speed optical transceiver evaluation board, capable of operating up to 56Gbps bit rate.
Key Features
- Four-channel transceiver architecture
- Signal integrity optimised for 56Gbps
- Controlled impedance routing
- Differential high-speed layout
- Designed for space-grade validation
High-speed RF design at these data rates requires careful management of:
- Differential impedance control
- Stack-up definition
- Crosstalk mitigation
- Power integrity
- EMI reduction
The board layout was engineered to guarantee signal integrity under demanding environmental conditions typical of space missions.
FPGA Board Design for Real-Time Processing
Space electronics design does not stop at schematics. Industrialisation and manufacturability are critical to ensure repeatability and risk mitigation.
PCB Technical Specifications
- 8-layer PCB stack-up
- Controlled impedance for differential pairs
- Designed according to electronics manufacturing rules
- Optimized for signal integrity and production yield
The DFM process included:
- Stack-up validation
- Manufacturing tolerance analysis
- Supplier capability alignment
- Early procurement risk mitigation
This structured design methodology reduces non-conformities during qualification and production phases.
Design for Manufacturing (DFM) & Controlled Impedance PCB Layout
The system integrates a high-performance FPGA (with full custom IPs) combined with an ARM Cortex-M3 MCU, enabling real-time data acquisition and processing.
System Capabilities
- Real-time current sensing circuitry
- Sigma-delta ADC integration
- Programmable waveform generator
- Real-time programmable window comparator
- Embedded control and supervision
This architecture ensures deterministic performance, essential for high-reliability space electronics design.
The FPGA design approach focused on:
- Modular IP architecture
- Radiation-aware design strategies
- Redundant monitoring
- Procurement traceability of critical components
Main FPGA Board – Sensors Acquisition System
A dedicated custom electronics design was developed to read up to 32 digital inputs and process data in real time.
System Highlights
- 32 Digital Inputs (LVDS interface)
- Custom protocol over RJ45
- 8 SFP communication ports (1Gb/s)
- 4 SMA synchronisation interfaces
- USB debug interface
- Dual redundant 12V / 6A power input
The controlled impedance PCB layout ensures reliable differential data transmission, essential for high-speed communication in space-grade systems.
Redundant power input and deterministic communication architecture contribute directly to system-level risk mitigation.
Qualification Testing: Variable Radiation Attenuator
Electronics intended for space applications must undergo rigorous qualification testing, including radiation exposure.
A variable radiation attenuator was developed for use with a Cobalt-60 irradiator system. The irradiator provides radiation exposure but does not allow intensity control. To solve this, a mechanical attenuation structure was engineered.
Attenuator Design Characteristics
- Aluminum structural frame
- Dual sliding metal frames
- Rail alignment system
- Configurable lead sheet thickness
- Two selectable attenuation levels
This solution enables controlled radiation exposure during qualification testing, supporting validation and risk mitigation activities.
Mechanical Design and System Integration
Mechanical design is a critical part of high reliability electronics development.
The system was engineered considering:
- Structural stability
- Thermal behavior
- Integration constraints
- Radiation shielding compatibility
- Maintainability and test access
Mechanical and electronic co-design ensures full system validation before deployment.
End-to-End Design Approach for Space Applications
This project demonstrates a complete RF design methodology for space electronics, covering:
- High-speed transceiver development
- FPGA-based real-time processing
- Controlled impedance PCB design
- Industrialization and DFM
- Radiation qualification testing
- Mechanical integration
- Procurement traceability
- Risk mitigation strategy
Designing for space is not only about performance. It is about reliability, validation, and controlled execution at every stage.
Conclusion
High reliability RF design for space applications demands a multidisciplinary engineering approach integrating electronics, mechanics, qualification testing, and industrialisation.
From 56Gbps optical transceivers to radiation attenuation systems, this development reflects a comprehensive strategy focused on design excellence, qualification readiness, and risk mitigation.
