Handling With SoC Generated MmWave Frequency > 30 GHz
Oct 22, 2024
this article would like to describe the special but omnipresent technical topic
Handling with System on Chip generated mmWave Frequency > 30 GHz
is a challenging PCB technology topic!
When semiconductor miniaturisation and Chip generated RF- or mmWave signals need impedance
controlled and signal integrity design -
this is a new chance to get in touch with the new way of thinking in 3D-printing electronics
Have a Look on NXP Automotive Radar One-Chip RFSoC Working on 77 GHz
as example:
For enabeling 360 degree sensing
the
distributribution and operation with multiple "one-chip" generated mmWave signals
to antennas or antenna ports is essential.
The Task Is
How to distribute RF- and mmW-Generating signals from chip best
Semiconductor-Chip to PCB interface and chip to antenna
routing by
- impedance matching, low reflections
- low insertion loss
Semiconductor-Chip mmWave - Probe testing
- e.g. Needle probes have challenges
- RF impedance control
- unwanted loss
- unwanted interference
Boards with mmWave and waveguide Adapters
- e.g. WR12 Interface
- PCBside mechanical footprint is needed (see mounting instructions)
- large mechanical interface for exact and robust alignement
- lack of space if more interfaces needed
NXP SAF85xx Top / Bottom footprint with 4 RX and 4 TX channels
RF probing case study (2022, by FormFactor, Inc)
Waveguide PCB-Launch Connector (by SPINNER)
Mounting instruction for PCB coaxial launch connector (by SPINNER)
What Is the Problem and How You Have to Work on It ?
How to connect the antennas
This blog by Marta Martínez Vázquez (Senior Staff Engineer, Renesas)
is explaining very good the technical situation.
Radar MMIC to antenna connection through BGA interfaces (Foto by Renesas)
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