Die-to-Die Inductive Communication via Magnetic Coupling
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Solution Overview
Problem
Conventional methods for achieving galvanic isolation between circuits are often expensive, space-consuming, and inefficient, making them unsuitable for applications requiring effective electrical isolation while enabling communication between circuits with different voltage references or to prevent transient signal interference.
Innovation Solution
The use of inductive communication devices comprising two IC dies with aligned conductive coils and a dielectric component providing galvanic isolation, allowing for bi-directional communication through magnetic coupling while maintaining electrical isolation, packaged within a single integrated circuit package.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional galvanic isolation techniques (optical isolators, capacitive isolators, transformer-based isolators) are used, then electrical isolation between circuits is achieved, but the device becomes expensive, space-consuming, and power-intensive
Solution Approach 1:
The patent replaces conventional optical, capacitive, or transformer-based isolation mechanisms with a magnetic field-based inductive coupling system. Two coils are positioned in close proximity (one on each IC die) to establish magnetic coupling, enabling galvanic isolation through magnetic field interaction rather than physical electrical separation components. This substitution dramatically reduces device size and complexity while maintaining isolation effectiveness.
Solution Approach 2:
The patent integrates the isolation function directly into the IC die structure by fabricating coils on the die surface and stacking multiple dies with intervening dielectric layers. The isolation mechanism is nested within the semiconductor packaging itself, eliminating the need for separate isolation components. The coils are embedded in or on the die, and the dielectric structure is integrated between the dies, creating a compact nested architecture.
2Reliability
If conventional isolation techniques are used, then galvanic isolation is provided, but significant power consumption occurs
Solution Approach 1:
The magnetic field-based inductive coupling replaces active isolation components (optical isolators requiring LEDs and photodetectors, transformer-based isolators requiring magnetization) with a passive magnetic coupling mechanism. The coils establish a magnetic field that couples signals between isolated circuits without requiring continuous power input for the isolation mechanism itself, significantly reducing power consumption compared to conventional active isolation techniques.
3Reliability
If galvanic isolation is implemented to protect low voltage circuits from high voltage circuits, then circuit safety is improved, but communication between the circuits becomes complex and expensive
Solution Approach 1:
The patent replaces complex communication interfaces (optical transmitters/receivers, capacitive coupling circuits, transformer windings) with simple magnetic coupling between two coils. The coils are fabricated using standard semiconductor manufacturing processes, and the magnetic coupling provides bidirectional communication capability through the galvanic isolation barrier. This simplification reduces manufacturing complexity and cost while maintaining circuit protection.
4Object-affected harmful factors
If complete galvanic isolation is provided between control circuit and IGBT circuit, then noise isolation is achieved, but the system becomes costly and space-intensive
Solution Approach 1:
The isolation system is nested within the semiconductor package by integrating coils directly on the IC die surfaces and stacking dies with thin dielectric layers between them. This nested architecture reduces the isolation device area to the footprint of the IC packages themselves, eliminating the need for large external isolation components that would be required by conventional techniques.
Solution Approach 2:
The magnetic field-based coupling provides noise isolation through the galvanic barrier without requiring large physical separation or shielding structures. The magnetic field confines the electromagnetic interaction to the immediate vicinity of the coils, providing effective noise isolation in a compact area compared to conventional isolation techniques that require larger physical dimensions.
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 solution effectively provides galvanic isolation between circuits, enabling efficient communication while reducing costs and space requirements, and effectively preventing transient signal interference, suitable for applications like automotive hybrid electric vehicle systems and AC power isolation.
Implementation Method 1
inductive communication devices comprising two IC dies with aligned conductive coils and a dielectric component providing galvanic isolation, allowing for bi-directional communication through magnetic coupling while maintaining electrical isolation
Data Source
AI summary
Embodiments of inductive communication devices include first and second galvanically isolated IC die and a dielectric structure. Each IC die has a coil proximate to a first surface of the IC die. The IC die are arranged so that the first surfaces of the IC die face each other, and the first coil and the second coil are aligned across a gap between the first and second IC die. The dielectric structure is positioned within the gap directly between the first and second coils, and a plurality of conductive structures are positioned in or on the dielectric structure and electrically coupled with the second IC die. The conductive structures include portions configured to function as bond pads, and the bond pads may be coupled to package leads using wirebonds. During operation, signals are conveyed between the IC die through inductive coupling between the coils.