High-Bandwidth Communication: ESD and I/O Protection for Wired, Wireless, and Optical Interfaces

Modern SoCs rely on high-bandwidth interfaces to move data between chips, modules, and systems — whether via wireless protocols like Bluetooth or WiFi, optical connections, or wired links like SerDes and USB.

These interfaces demand ultra-fast signal paths with minimal parasitic capacitance, low voltage swings, and tight power budgets. Conventional I/O and ESD protection approaches from foundries often fail to meet these requirements.

Sofics provides custom ESD and I/O IP optimized for high-speed communication. Our IP has been adopted across projects from 150+ customers globally, enabling safe, reliable data transfer without sacrificing performance

Custom Requirements for High-Speed Interfaces

Designers of high-frequency, high-speed interfaces face unique challenges where generic IP falls short:

• Low-parasitic capacitance for signal integrity
  SerDes, DisplayPort, USB, and MIPI interfaces need ESD protection that does not degrade high-speed signal paths.
• Protection on advanced nodes
  Most high-speed interfaces are built on FinFET or advanced CMOS. These nodes are highly sensitive to ESD damage and need tailored clamp design.
• Low-voltage signaling
  Interfaces operating at or below 1V require ESD solutions compatible with thin-oxide transistors and low VDD levels.
• Low leakage for RF front-ends
  ESD solutions for LNA inputs in Bluetooth, GPS, WiFi or UWB receivers must have extremely low leakage to maintain a high Q-factor.
• Scalable ESD robustness
  Some applications need to meet or exceed industry standards like 8kV IEC 61000-4-2 (e.g. USB, HDMI, DisplayPort). Sofics clamps are scalable to these levels.
• Small footprint for 2.5D/3D integration
  Die-to-die interfaces in chiplets require compact ESD IP with minimal parasitics and lower robustness for intra-package protection.

Sofics IP for High-Speed Communication

Key Focus Areas

• Wired interfaces
  HDMI, DisplayPort, USB, MIPI, SerDes, LVDS, PCIe, V-by-One — protected with low-capacitance ESD cells
• Wireless communication
  Bluetooth, WiFi, GPS, NFC, 4G, 5G — IP with low leakage for RF front-end integration
• Optical communication
  Silicon photonics and optical transceivers benefit from custom ESD for laser drivers and optical receivers that operate at a higher voltage
• Die-to-die links in chiplets
  Custom protection for 2.5D and 3D-stacked dies, including hybrid bonding
• Low-voltage, high-frequency interfaces
  Support for sub-1V signaling, thin-oxide devices, and FinFET-based systems

Testimonial: DecaWave – Now Qorvo

• DW1000 ultra-wideband radio transceiver
• Indoor positioning for tracking patients in hospitals or locating stock in warehouses

William McFadden, VP Operations

“The chip needs robust protection against the ESD, without compromising its high-speed performance. Sofics was far more cost-effective than other approaches to ESD protection and delivered a customized solution in less than a week.”

These are examples from many IP delivery projects. If you did not find the example you were looking for you should contact us (info@sofics.com) to discuss your application and requirements.

Further reading

• Blog article “Optimized Local I/O ESD Protection in FinFET Technology for 2.5D and 3D hybrid integration“
• Blog article “Optimized Local I/O ESD Protection for SerDes In Advanced SOI, BiCMOS and FinFET Technology“
• Blog article “Optical communication also requires ESD protection“
• Partnership announcement with Mixel MIPI
• Lantiq licenses Sofics’ ESD solutions
• Press announcement about our cooperation with DecaWave (now Qorvo)