Inductive Coupling Interposer for Misaligned Stacked IC Coils
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Solution Overview
Problem
Misalignment of central axes of coils used for inductive coupling leads to signal attenuation and increased bit error rates, making reliable communication between stacked IC chips challenging, especially when coils are manufactured by different vendors with varying constraints and layouts.
Innovation Solution
An electronic circuit with an interposer that reconstructs inductive coupling by rewiring coils between chips, using an asynchronous receiver capable of properly receiving signals, allowing for arbitrary coil positioning and reducing the need for timing adjustments and synchronizing signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If coils are manufactured by different vendors with varying constraints and layouts, then manufacturing cost and flexibility are improved, but alignment precision between coil central axes deteriorates
Solution Approach 1:
The patent introduces a timing adjustment mechanism as an intermediary component between the transmitter and receiver coils. This mediator compensates for the misalignment caused by manufacturing variations from different vendors, allowing each coil to be manufactured independently with standard constraints while maintaining effective inductive coupling through timing synchronization.
Solution Approach 2:
The patent changes the timing parameter of the receiver to match the transmitter's pulse width. By adjusting the timing parameter rather than physically realigning the coils, the system accommodates manufacturing variations from different vendors while maintaining optimal inductive coupling and signal reception.
2Reliability
If precise alignment of coil central axes is required, then signal reception quality is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The receiver circuit automatically adjusts its timing to match the transmitter's pulse width without requiring external alignment control mechanisms. This self-adjusting timing capability enables the system to maintain high signal reception quality while avoiding the complexity of active alignment control systems.
3Ease of manufacture
If coil alignment is relaxed for easier manufacturing, then manufacturing cost is reduced, but signal attenuation increases
Solution Approach 1:
The patent changes the timing parameter of the receiver to compensate for the reduced coupling efficiency caused by relaxed alignment. By extending the receiver's pulse width to match the transmitter's pulse width, the system recovers signal strength even when coils are not precisely aligned, thereby maintaining reliability while enabling easier manufacturing.
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
Enables reliable asynchronous communication between coils, reducing power consumption and costs by allowing optimal coil placement, suppressing unwanted inductive coupling, and eliminating the need for redesigning transmission/reception circuits based on distance or coil alignment.
Implementation Method 1
communication between integrated-circuit (IC) bare chips stacked on one another by inductive coupling between coils formed by wiring on the chips
Implementation Method 2
communication between printed wiring boards, such as contactless memory cards by inductive coupling between coils formed by wiring on the chips or boards
Data Source
AI summary
An electronic circuit includes: a first substrate having a first coil and a first transmission circuit connected to the first coil that asynchronously outputs the signal to the first coil; a second substrate having a second coil at a position corresponding to the first coil that forms a communication channel with the first coil to receive the signal and a third coil connected to the second coil by a wire on the substrate and transmits the signal; and a third substrate having a fourth coil at a position corresponding to the third coil that forms a communication channel with the third coil and a first reception circuit connected to the fourth coil to asynchronously receive the signal. The substrates are stacked on one another, and the first transmission circuit changes a current to the first coil each time a logical value of transmission data changes.