LC Tank Electromagnetic Radiation Suppression via Inverse Field Generation
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Solution Overview
Problem
Integrated circuits, particularly those with differential mode LC tanks, emit electromagnetic radiation due to mismatched inductance between terminals, causing interference with internal and external electronic devices and posing health risks, necessitating effective suppression methods without impacting performance.
Innovation Solution
An electromagnetic radiation suppression structure, such as a rectangular ring or circular ring, is integrated in a second semiconductor die or printed circuit board to generate inverse radiation against the emission from an LC tank source, reducing radiation through Lenz's law-induced magnetic fields and alleviating parasitic capacitance effects in a 3D IC stacking architecture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a differential mode LC tank is used to achieve high performance, then the operating efficiency is improved, but electromagnetic radiation is generated due to mismatched equivalent inductance between positive and negative terminals
Solution Approach 1:
The patent applies preliminary anti-action by introducing a common mode LC tank that generates common mode signals in advance to counterbalance the differential mode signals. This preemptive approach creates opposing electromagnetic fields that cancel out the harmful radiation from the differential mode LC tank, allowing high-performance operation without electromagnetic interference.
Solution Approach 2:
The patent uses an intermediary approach by introducing a coupling network that includes a common mode LC tank as a mediator between the differential mode LC tank and the external environment. This intermediary structure transforms and balances the electromagnetic signals, converting harmful differential mode radiation into benign common mode signals that do not cause interference.
2Productivity
If the equivalent inductance between positive and negative terminals is increased to improve performance, then the operating efficiency is improved, but the mismatch between terminals increases causing more electromagnetic radiation
Solution Approach 1:
The patent implements feedback by using the common mode LC tank to sense and counterbalance the differential mode signals. The coupling network provides a feedback mechanism where the common mode signals generated by the common mode LC tank automatically adjust to balance the inductance mismatch effects, eliminating the need for extremely precise manual matching during manufacturing.
3Ease of manufacture
If separate manufacturing processes are used for radiation suppression structure and LC tank components, then the manufacturing flexibility is improved, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the electromagnetic radiation suppression function into a separate common mode LC tank and coupling network, distinct from the differential mode LC tank. This segmentation allows each component to be manufactured independently using optimized processes for their specific functions, then assembled together, reducing overall manufacturing complexity while maintaining flexibility.
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
This approach effectively suppresses electromagnetic radiation from LC tanks while maintaining performance, reducing mismatch and parasitic capacitance, and is feasible with existing semiconductor manufacturing processes, thereby adhering to EMI regulations.
Implementation Method 1
the electromagnetic radiation suppression structure is used for generating an inverse electromagnetic radiation against electromagnetic radiation emission of the electromagnetic radiation source structure
Data Source
AI summary
An electronic apparatus includes an electromagnetic radiation source structure and an electromagnetic radiation suppression structure. The electromagnetic radiation source structure is formed in at least one first semiconductor die. The electromagnetic radiation suppression structure is formed in a second semiconductor die, and is used for generating an inverse electromagnetic radiation against the electromagnetic radiation emission of the electromagnetic radiation source structure by sensing the electromagnetic radiation emission of the electromagnetic radiation source structure, to suppress the electromagnetic radiation emission of the electromagnetic radiation source structure from passing through the electromagnetic radiation suppression structure. Another electronic apparatus includes an electromagnetic radiation source structure and an electromagnetic radiation suppression structure. The electromagnetic radiation suppression structure is formed in a printed circuit board. The electromagnetic radiation source structure is formed in a semiconductor die. Associated electromagnetic radiation suppression methods are also disclosed.