Galvanic Isolation IC With Resonant Inductive Signal Coupling
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Solution Overview
Problem
Existing galvanic isolators face challenges in providing high efficiency and reliability due to issues with signal transmission and noise interference, particularly when dealing with differential signals and sudden voltage changes, which can lead to malfunction or damage.
Innovation Solution
The integration of inductors and capacitors in a semiconductor process, where the inductors are inductively coupled and the capacitors are strategically positioned to generate resonant frequencies, ensuring effective signal transmission while maintaining isolation voltage and reducing parasitic resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional galvanic isolators are used for signal transmission between circuits with different reference potentials, then galvanic isolation is provided, but signal transmission quality deteriorates due to noise interference and parasitic resistance
Solution Approach 1:
The patent introduces magnetic coupling as an intermediary mechanism for signal transmission. Instead of direct electrical connection, the signal is transmitted through magnetic fields generated by transmit inductors and received by receive inductors. This magnetic field intermediary effectively blocks noise and parasitic resistance while maintaining signal integrity across the galvanic isolation barrier.
Solution Approach 2:
The patent replaces traditional electrical signal transmission mechanisms with magnetic field-based transmission. By substituting direct electrical connections with inductive coupling, the system eliminates the harmful effects of parasitic resistance and noise interference that plague conventional galvanic isolators, achieving cleaner signal transmission while maintaining isolation.
2Manufacturing precision
If inductors and capacitors are integrated in semiconductor process, then manufacturing precision is improved, but device complexity increases due to multiple conductive layers and patterns
Solution Approach 1:
The patent combines inductors and capacitors into a single integrated circuit structure using semiconductor fabrication processes. Multiple conductive layers are merged to form both inductive and capacitive elements within the same device footprint, achieving precise integration while managing complexity through unified design and manufacturing.
Solution Approach 2:
The patent utilizes vertical stacking of multiple conductive layers to implement inductors and capacitors in three-dimensional space. By transitioning from planar to volumetric arrangement, the design achieves high integration precision without excessive lateral complexity, as elements are organized across multiple vertical layers rather than spreading horizontally.
3Reliability
If capacitors are positioned to generate resonant frequencies, then signal transmission quality is improved, but device complexity increases due to strategic positioning requirements
Solution Approach 1:
The patent optimizes signal transmission by adjusting the resonant frequency parameters of integrated capacitors. By carefully selecting capacitor values and positioning them to create specific resonant frequencies, the system enhances signal quality and bandwidth. This parameter optimization is achieved through systematic design methodologies that manage the complexity of positioning multiple capacitors at precise locations.
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 configuration enhances signal transmission quality, reduces noise interference, and prevents malfunctions due to sudden voltage changes, thereby providing high reliability and efficient galvanic isolation.
Implementation Method 1
a second inductor disposed in a second conductive layer above the first conductive layer and inductively coupled to the first inductor
Implementation Method 2
a capacitor configured to generate a signal having a resonant frequency based on the first inductor and the second inductor
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
Provided is a device including a first integrated circuit, wherein the first integrated circuit includes a first inductor comprising a first pattern disposed in a first conductive layer, and a first capacitor comprising a first electrode disposed in the first conductive layer and electrically connected to the first inductor and a second electrode disposed in a second conductive layer above the first conductive layer and electrically connected to a first bonding wire.