Integrated Acoustic Filter Circuit Layout for Shorter Interconnects
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Solution Overview
Problem
Acoustic wave devices, such as surface acoustic wave (SAW) filters, face challenges in achieving efficient performance and reducing size due to the need for bulky analog components and long electrical interconnects through a package substrate, which lead to inefficiencies and increased package size.
Innovation Solution
The solution involves integrating circuit elements, such as capacitors, inductors, and interconnects, directly between the substrates of an acoustic device, eliminating the need for external bulky components and reducing the size of the package substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If analog components and electrical interconnects are mounted on a package substrate, then the acoustic filter can be assembled, but the package size increases and efficiency decreases
Solution Approach 1:
The patent merges the acoustic resonator device and analog circuit components into a single integrated acoustic device. The circuit elements (capacitors, inductors, interconnects) are formed directly on the same substrate as the acoustic resonator, eliminating the need for separate package substrate mounting. This integration reduces the overall package area while improving efficiency by shortening electrical paths.
Solution Approach 2:
The patent transitions from a two-dimensional layout on a package substrate to a three-dimensional integrated structure. Circuit elements are formed in multiple layers above and below the acoustic resonator substrate, utilizing vertical space to reduce the horizontal footprint. This dimensional change allows compact integration without compromising electrical performance.
2Reliability
If long electrical interconnects are used through the package substrate, then components can be connected, but signal losses increase
Solution Approach 1:
The electrical interconnects are integrated directly with the acoustic resonator on the same substrate, eliminating long external connections through the package substrate. The interconnects are formed as part of the resonator structure itself, significantly reducing path length and associated signal losses.
3Reliability
If bulky analog components are used to compensate for losses, then filter performance can be maintained, but device size increases
Solution Approach 1:
The analog circuit components (capacitors, inductors) are integrated directly with the acoustic resonator in a compact arrangement on the same substrate. This eliminates the need for bulky external components while maintaining filter performance through optimized short electrical paths and precise component placement.
Solution Approach 2:
The patent changes the physical parameters of circuit elements by forming them as thin-film structures integrated with the resonator. Capacitors and inductors are created using deposited metal layers and dielectric materials, achieving the required electrical values in a compact form factor rather than using traditional bulky discrete components.
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 approach enhances the efficiency and quality factor of the acoustic filter by reducing losses associated with long interconnects and allows for a smaller package size, improving overall performance and compactness of the acoustic device.
Implementation Method 1
an acoustic resonator with electrodes on a surface of a piezoelectric material
Data Source
AI summary
An acoustic device includes circuit elements, such as analog circuit components, between the first and second substrate and coupled to an acoustic resonator to form an acoustic filter within the acoustic device. In some examples, forming the circuit elements between the first substrate and the second substrate includes forming the first circuit elements in insulating material on the second substrate before coupling the second substrate to a first side of the first substrate. The circuit elements disposed between the first and second substrates may include capacitors, inductors, and electrical interconnects coupled to the acoustic resonator on the first substrate. Additional features may be included in the insulating material. The acoustic device avoids the need for bulky analog components coupled to the acoustic resonator via long interconnects through a package substrate, making it possible to reduce an acoustic device's package size.