Multi-Band Acoustic Filter Circuit With Shared Blocking Attenuation
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Solution Overview
Problem
Existing multi-band acoustic multiplexer filter circuits face challenges in optimizing single-band acoustic filters due to stringent out-of-band rejection requirements, leading to increased complexity and potential reliability issues.
Innovation Solution
A multi-band acoustic multiplexer filter circuit design that incorporates multiple single-band acoustic filters and a multi-band filter circuit, where the multi-band filter circuit shares the burden of attenuation, allowing single-band filters to have relaxed requirements, thereby reducing complexity and improving overall band rejection performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If single-band acoustic filters are designed to meet stringent out-of-band rejection requirements independently, then band rejection performance is improved, but filter complexity increases
Solution Approach 1:
The patent combines multiple single-band acoustic filters with a common multi-band filter circuit that provides shared attenuation functionality. The multi-band filter circuit is coupled to a common node and provides attenuation for multiple passbands simultaneously, allowing the single-band filters to have relaxed attenuation requirements while maintaining overall system performance.
Solution Approach 2:
The multi-band filter circuit serves multiple functions by providing attenuation for several different passbands through a single circuit element. This universal component handles the common attenuation requirements for all single-band filters, reducing the burden on each individual filter and simplifying the overall design.
2Reliability
If single-band acoustic filters are designed with high attenuation capability, then out-of-band rejection is improved, but the number of components and circuit complexity increases
Solution Approach 1:
The patent merges the attenuation functionality across multiple filters into a shared multi-band filter circuit. Instead of each single-band filter independently providing full attenuation capability, the system combines several filters with a common filter circuit that collectively provides the required attenuation, reducing the total number of components needed.
Solution Approach 2:
The patent discards the requirement for each individual filter to provide complete attenuation capability, and instead recovers the overall attenuation performance through the collective action of multiple filters working together with the shared multi-band filter circuit.
3Adaptability or versatility
If multiple single-band filters are used to achieve multi-band filtering, then filtering flexibility is improved, but overall circuit complexity increases
Solution Approach 1:
The patent merges multiple single-band filters into a unified multi-band filtering system by coupling them to a common node and incorporating a shared multi-band filter circuit. This approach maintains the flexibility of having multiple frequency bands while reducing circuit complexity through component sharing and common coupling.
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 design optimizes single-band acoustic filters by reducing their complexity and enhancing reliability through shared attenuation, achieving improved out-of-band rejection across multiple passbands.
Implementation Method 1
Acoustic resonators, such as Surface Acoustic Wave (SAW) resonators and Bulk Acoustic Wave (BAW) resonators, are used in many high-frequency communication applications
Implementation Method 2
SAW resonators are often employed in filter networks that operate at frequencies up to 1.8 GHZ
Implementation Method 3
BAW resonators are often employed in filter networks that operate at frequencies above 1.5 GHz
Implementation Method 4
SAW and BAW-based filters have flat passbands, steep filter skirts, and squared shoulders at the upper and lower ends of the passbands and provide excellent rejection outside of the passbands
Data Source
AI summary
A multi-band acoustic multiplexer filter circuit is provided. The multi-band acoustic multiplexer filter circuit includes multiple single-band acoustic filters and a multi-band filter circuit that can pass a signal in multiple passbands. In embodiments disclosed herein, the single-band acoustic filters and the multi-band filter circuit can be configured to collectively attenuate the signal in some of the passbands to thereby prevent the signal from becoming a blocking signal to any other passbands (e.g., adjacent passbands). By employing the multi-band filter circuit to provide a portion of the required attenuation to the blocking signal, each of the single-band acoustic filters can be subject to more relaxed attenuation requirements, thus making it possible to reduce complexity of the single-band acoustic filters and improve overall band rejection performance of the multi-band acoustic multiplexer filter circuit.