Broadside Coupled Interconnects for RF Power IC Grounding

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Solution Overview

Problem

Modern RF power integrated circuit devices face issues such as inconsistent RF grounding, parasitic inductance, non-uniform input/output match, and poor isolation due to conventional bonding wire arrays, which limit performance and efficiency, especially in achieving uniform signal distribution and controlling harmonics.

Innovation Solution

A coupling element comprising a flexible laminate structure with conductive layers bonded to a substrate, providing broadside coupled interconnects that reduce mutual coupling and enable uniform signal distribution, allowing for tight electromagnetic coupling and controlled impedance across a wide frequency band, eliminating the need for expensive conductive flanges and improving power combining efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If conventional bonding wire arrays are used for interconnects, then device complexity is reduced and ease of manufacture is improved, but parasitic inductance increases and signal distribution uniformity deteriorates

Engineering Contradiction:

Improvesignal distribution uniformityVSAvoidinterconnect structure complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent transitions from planar bonding wire arrays to three-dimensional broadside coupled interconnects where conductive layers on opposite sides of the substrate are positioned close together, creating vertical electromagnetic coupling that reduces parasitic inductance and improves signal distribution uniformity

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The invention uses composite laminate structures combining conductive layers with dielectric substrate materials to create integrated interconnects that provide both mechanical support and electrical coupling functions, reducing parasitic effects while maintaining manufacturability

Inventive Principle:

Principle #40Composite materials

2Reliability

If conventional bonding wire arrays are used, then ease of manufacture is improved, but RF grounding consistency and isolation between devices deteriorate

Engineering Contradiction:

ImproveRF grounding consistencyVSAvoidfabrication simplicity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent merges the grounding function with the interconnect structure by integrating ground references directly into the laminate configuration, where conductive layers and substrate combinations provide both signal transmission and consistent RF grounding paths simultaneously

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The dielectric substrate acts as an intermediary between conductive layers, providing controlled impedance paths and consistent RF grounding while maintaining ease of manufacture through standard laminate fabrication processes

Inventive Principle:

Principle #24Intermediary (Mediator)

3Power

If conductive flanges are used for coupling, then power combining efficiency is improved, but manufacturing cost increases

Engineering Contradiction:

Improvepower combining efficiencyVSAvoidfabrication cost

Core Design Contradiction:

PowerVSEase of manufacture

Solution Approach 1:

The patent replaces expensive conductive flanges with cost-effective laminate structures that achieve comparable or superior power combining efficiency through broadside coupled interconnects, using standard printed circuit board materials instead of specialized conductive components

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The invention changes the coupling mechanism from conductive flange-based electromagnetic coupling to laminate-based broadside coupling, adjusting the geometric parameters of conductive layers and substrate thickness to optimize power combining efficiency while reducing material costs

Inventive Principle:

Principle #35Parameter changes

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

The solution achieves significantly more uniform input/output signal distribution, reduces parasitic inductance effects, and enhances power combining efficiency across a wide frequency band, while allowing for a less expensive and non-conductive flange, thereby improving the overall performance and reducing fabrication costs of RF power devices.

Implementation Method 1

broadside coupled interconnects that reduce mutual coupling and enable uniform signal distribution, allowing for tight electromagnetic coupling

Methodology Applied

Scientific EffectElectromagnetic coupling: Electromagnetic Induction

Data Source

PatentUS10115697B2Coupling element, integrated circuit device and method of fabrication therefor

Publication Date: 2018.10.30 NXP USA INC

AI summary

A coupling element for providing external coupling to a semiconductor die within an integrated circuit package. The coupling element comprises a flexible laminate structure comprising a flexible, electrically insulating substrate layer, a first conductive layer bonded to a first surface of the substrate layer, and a second conductive layer bonded to a second surface of the substrate layer. The coupling element is arranged to be coupled to the semiconductor die such that the first and second conductive layers are electrically coupled to electrical contacts of the semiconductor die. The coupling element is further arranged to extend through the integrated circuit package when electrically coupled to the semiconductor die, and for the first and second conductive layers to be further electrically coupled to at least one external component.