Closed-Loop Shielding Circuit for LC Tank Radiation Control
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Solution Overview
Problem
Integrated circuit (IC) chips with inductors and capacitors generate undesirable radiation due to magnetic fields, causing signal interference, which existing technologies fail to adequately address.
Innovation Solution
A shielding circuit comprising two closed-loop shielding structures, one adjacent to the inductor and the other to electronic components, formed from metal materials and designed to surround and be electrically insulated from the inductor and capacitors, respectively, to reduce or eliminate radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If an LC tank circuit is utilized in a radio frequency circuit to operate at higher frequency and improve phase noise performance, then the frequency operation and phase noise performance are improved, but magnetic field induced by the inductors creates undesirable radiation causing signal interference
Solution Approach 1:
The patent applies the principle of converting harm into benefit by using the magnetic field generated by the inductor for its intended purpose while simultaneously utilizing a shielding structure to convert the harmful radiation effect into a beneficial containment effect. The shielding structure captures and redirects the magnetic field lines, preventing them from radiating outward and causing interference, while still allowing the inductor to function at high frequencies with good phase noise performance.
2Object-generated harmful factors
If shielding structures are added to reduce radiation from inductors and electronic components, then radiation and signal interference are reduced, but device complexity increases
Solution Approach 1:
The patent employs a thin film shielding structure that acts as a flexible barrier between the inductor and surrounding components. This thin film approach provides effective radiation shielding without adding significant structural complexity or occupying excessive space. The shielding structure is integrated into the existing circuit layout, maintaining simplicity while reducing radiation emissions.
3Object-generated harmful factors
If shielding structures are placed adjacent to inductors and electronic components, then radiation is reduced, but area occupied by the circuit increases
Solution Approach 1:
The patent implements a nested shielding configuration where the shielding structure is positioned to surround or enclose the inductor and electronic components in a compact arrangement. This nesting approach allows the shielding to be integrated within the existing circuit footprint rather than adding external extensions, effectively reducing radiation while minimizing the increase in overall circuit area.
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
Effectively reduces or eliminates radiation generated by inductors and other electronic components, thereby minimizing signal interference and improving phase noise performance in radio frequency circuits.
Implementation Method 1
a first shielding structure forms a first closed loop and is disposed adjacent to an inductor comprised in the semiconductor device. The second shielding structure forms a second closed loop and is disposed adjacent to an electronic component coupled to the inductor
Data Source
AI summary
A shielding circuit applied to a semiconductor device includes a first shielding structure and a second shielding structure. The first shielding structure forms a first closed loop and is disposed adjacent to an inductor comprised in the semiconductor device. The second shielding structure forms a second closed loop and is disposed adjacent to an electronic component coupled to the inductor.