SAW Multiplexer Die Split for Low-Loss RF Front-End Miniaturization
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Solution Overview
Problem
Existing acoustic wave devices face challenges in achieving efficient size reduction, cost-effectiveness, and high power durability while maintaining low loss filter performance, particularly in radio frequency front-end modules of mobile devices.
Innovation Solution
The integration of two separate dies with different acoustic wave device structures, including a multilayer piezoelectric substrate (MPS) die for transmission filters and a temperature-compensated SAW (TC-SAW) die for reception filters, electrically connected to form a duplexer, which reduces overall size and manufacturing costs while maintaining high power durability and low loss performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a single die is used for both transmission and reception filters, then device complexity is reduced, but device size and manufacturing costs cannot be sufficiently reduced
Solution Approach 1:
The duplexer is divided into two separate dies: a first die containing transmission filters and a second die containing reception filters. This segmentation allows each die to be optimized independently for its specific function, reducing overall device size while maintaining functional complexity through modular architecture.
Solution Approach 2:
Each die is designed to perform multiple filter functions within its type. The first die contains multiple transmission filters (e.g., Tx1, Tx2) and the second die contains multiple reception filters (e.g., Rx1, Rx2), allowing each die to serve multiple purposes while maintaining specialized optimization.
2Reliability
If high power durability is achieved through robust filter design, then reliability improves, but device size and manufacturing costs increase
Solution Approach 1:
Different die types are selected for transmission and reception filters based on their specific power requirements. Transmission filters handling high-power signals use dies optimized for power durability, while reception filters use dies optimized for sensitivity and size, achieving local optimization of quality characteristics.
Solution Approach 2:
The invention utilizes different acoustic wave parameters (surface acoustic wave for transmission, bulk acoustic wave for reception) to optimize each filter type for its specific operating conditions, achieving high power durability where needed while minimizing device size overall.
3Reliability
If different filter types are integrated on the same die, then device complexity is reduced, but filter performance and reliability deteriorate
Solution Approach 1:
The system segments different filter types onto separate dies, allowing each die to be optimized for its specific filter type requirements. This maintains high filter performance through specialized design while using standardized interconnection methods to manage the increased device complexity.
Solution Approach 2:
Electrical interconnections serve as intermediaries between the first die (transmission filters) and second die (reception filters), enabling functional integration while maintaining physical separation. This allows each die to be independently optimized for its filter type while achieving system-level integration.
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 achieves a smaller device size and lower manufacturing costs while ensuring high power durability and low loss filter performance, addressing the inefficiencies of conventional designs.
Implementation Method 1
Surface acoustic wave filters operate by converting electrical energy into acoustic or mechanical energy on a piezoelectric material. The surface acoustic wave filters comprise interdigital transducer (IDT) electrodes which converts an electrical signal into an acoustic wave and then back to an electrical signal.
Implementation Method 2
A surface acoustic wave resonator can include an interdigital transductor electrode on a piezoelectric substrate. The surface acoustic wave resonator can generate a surface acoustic wave on a surface of the piezoelectric layer on which the interdigital transductor electrode is disposed.
Data Source
AI summary
A multiplexer is disclosed. The multiplexer can include a multilayer piezoelectric substrate surface acoustic wave device that includes at least a portion of a transmission filter. The multiplexer can include a temperature compensated surface acoustic wave device that includes at least a portion of a reception filter. The reception filter is electrically connected to the transmission filter.