Waveguide Structure for High Frequency Signal Isolation
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Solution Overview
Problem
High-frequency wireless communication in systems on chip (SoC) faces challenges due to increasing copper interconnect loss, metal surface roughness, cross-talk interference, and spurious noise pickup, which deteriorate signal quality, especially as future ICs integrate millimeter wave transceiver circuits with high-speed digital circuits.
Innovation Solution
A novel waveguide structure is introduced, utilizing through silicon vias (TSVs) to separate and isolate high-frequency wireless communication paths from high-speed digital paths, with a completely enclosed waveguide system that uses anisotropic conductive films or adhesives for signal transmission, and is fabricated using a process involving silicon wafers, copper plates, and metal sputtering to enable efficient high-frequency RF signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If copper interconnects are used for high-speed data transfer, then data transfer capability is improved, but signal quality deteriorates due to increasing copper interconnect loss and metal surface roughness at high frequencies
Solution Approach 1:
The patent extracts the high-frequency RF signal path from the conventional copper interconnect structure by introducing a dedicated waveguide structure. The waveguide separates the RF signal transmission path from the digital signal paths, allowing high-frequency signals to be transmitted without suffering from copper interconnect loss and surface roughness effects that plague conventional interconnects.
Solution Approach 2:
The waveguide acts as an intermediary structure between the millimeter wave transceiver circuits and the external environment. It provides a specialized transmission path that mediates the high-frequency signal transmission, isolating it from the harmful effects of copper interconnects while still enabling data transfer functionality.
2Adaptability or versatility
If multiple signals are transmitted through the same interconnect structure, then communication functionality is improved, but cross-talk interference and spurious noise pickup increase
Solution Approach 1:
The patent segments the signal transmission paths by creating separate waveguide structures for RF signals and maintaining distinct copper interconnect paths for digital signals. This physical segmentation prevents cross-talk interference between RF and digital signals while allowing both communication functionalities to coexist on the same substrate.
Solution Approach 2:
The waveguide structure serves as an intermediary that isolates RF signals from digital signal paths. By introducing this intermediate transmission structure, the patent enables multiple signal types to be transmitted simultaneously without direct interaction that would cause cross-talk and noise pickup.
3Device complexity
If RF and digital circuits are integrated in the same SOC die, then system integration is improved, but signal interference between RF and digital signals becomes severe
Solution Approach 1:
The patent applies segmentation by dividing the SOC into distinct signal path regions: RF signals travel through waveguide structures while digital signals use copper interconnects. This spatial segmentation maintains high system integration while preventing signal interference between the two circuit types.
Solution Approach 2:
The waveguide structure acts as an intermediary transmission medium that isolates RF circuits from digital circuits within the same SOC. This intermediary path allows both circuit types to be integrated closely without direct signal interference, as the waveguide provides electromagnetic isolation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively contains high-frequency RF signals within the waveguide, reducing interference and maintaining signal quality by allowing multiple channels and modes of propagation, thereby enhancing data transfer efficiency between ICs.
Implementation Method 1
a first waveguide of the plurality of waveguides may be configured to support propagation of the plurality of modes of the high frequency wireless communication signal
Implementation Method 2
the contact pads may be coupled to through-silicon vias (TSVs) using an anisotropic conductive film or adhesive
Implementation Method 3
fabricated using a process involving silicon wafers, copper plates, and metal sputtering
Data Source
AI summary
An integrated circuit (IC) comprises a substrate, a first die mounted on the substrate, a second die mounted on the substrate and a waveguide structure mounted on the first die and the second die to enable high frequency wireless communication between the first die and the second die.