Detector Module Interposer and Flex Cable Routing

The patent introduces a flexible printed circuit board (FPC) as an intermediary component between the sensor array and the ASIC. The FPC serves as a mediator that can be routed through the recess to achieve short track lengths without requiring TSV processing, thereby avoiding the high manufacturing costs and complexity associated with TSV technology while maintaining mechanical robustness.

The patent utilizes the third dimension by routing the FPC through a recess (vertical space) rather than relying solely on planar connections. This dimensional approach allows the interconnect to achieve minimum track length by going through the depth of the module assembly, effectively reducing the electrical path length without increasing lateral footprint or requiring complex through-silicon vias.

The FPC acts as an intermediary that simplifies the overall device architecture by eliminating the need for TSV processing steps. The flexible circuit board provides a straightforward interconnection solution that reduces noise through controlled impedance routing and shielding capabilities inherent to FPC design, while avoiding the complex multi-step semiconductor processing required for TSV fabrication.

The patent extracts the interconnect function from the ASIC substrate itself (where TSVs would be required) and places it on a separate FPC component. This extraction allows the ASIC to remain a standard planar device without complex through-silicon via structures, while the FPC handles the interconnection function with inherent noise reduction capabilities through its flexible layered construction and grounding options.

The patent segments the interconnect function from the signal processing function by using a separate FPC component. This segmentation allows the ASIC to be optimized for its signal processing role with minimal die area, while the mechanical robustness is provided by the separate FPC and the overall module assembly structure. The FPC can be made sufficiently large and rigid without wasting expensive ASIC die area.

By routing the interconnect through the recess (utilizing vertical space), the patent eliminates the need for the ASIC to extend to the full sensor dimensions to provide mechanical support for TSVs. The FPC can provide the necessary mechanical strength through its construction and routing path without requiring the expensive ASIC die area to be expanded, thereby avoiding waste of valuable semiconductor real estate.