RF Multiplexer Filter-Resonator Paths for Sharper Notch Profiles
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Solution Overview
Problem
Existing RF multiplexers face challenges in achieving sharp notch profiles and optimal signal processing for radio-frequency signals, particularly in multiplexing applications where multiple signals need to be combined efficiently without excessive insertion loss or noise introduction.
Innovation Solution
Incorporating resonators, such as surface acoustic wave resonators, into the signal paths of multiplexers, either upstream or downstream of filters, to enhance the notch profile and improve signal processing, while allowing for flexible configurations like diplexers, triplexers, and quadplexers, and optionally including low-noise amplifiers for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If only filters are used in signal paths, then the device complexity is lower, but the notch profile sharpness is insufficient
Solution Approach 1:
The patent combines filters and resonators in hybrid circuits within signal paths. Each signal path includes both a filter and a resonator working together, where the resonator enhances the filter's notch profile sharpness. This merging of components achieves superior frequency selectivity and sharper notch profiles compared to using filters alone.
2Manufacturing precision
If resonators are added to all signal paths, then the notch profile sharpness is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent applies resonators selectively rather than uniformly across all signal paths. The design allows different signal paths to have different configurations - some with resonators and some without - based on their specific frequency requirements. This local quality approach optimizes performance where needed while maintaining ease of manufacture for other paths.
3Reliability
If resonators are placed upstream of filters, then the signal processing performance is improved, but the insertion loss increases
Solution Approach 1:
The patent provides flexible configuration options for resonator placement, allowing the system to be optimized for different operating conditions. The resonator can be positioned upstream, downstream, or in parallel with the filter depending on the specific application requirements, enabling dynamic optimization of the trade-off between signal processing performance and insertion loss.
4Manufacturing precision
If multiple resonators are added to a single signal path, then the frequency selectivity is improved, but the device complexity increases
Solution Approach 1:
The patent segments the frequency selection function across multiple components - using a combination of filters and resonators rather than relying on a single complex component. This segmentation allows each component to handle specific aspects of frequency selection, achieving high frequency selectivity while maintaining manageable device complexity through modular design.
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 integration of resonators in RF multiplexers provides sharper notch profiles and better isolation between frequency bands, reducing insertion loss and noise, thus enhancing the overall performance of RF signal processing and multiplexing operations.
Implementation Method 1
Each resonator can be a surface acoustic wave resonator, a bulk acoustic wave resonator, or a resonator having a high Q-factor value.
Implementation Method 2
a signal path with the resonator can provide a sharper notch profile for a radio-frequency signal than a signal path without the resonator
Data Source
AI summary
Circuits with filters and acoustic resonators. In some embodiments, a radio-frequency circuit can include a plurality of nodes and a common node. The radio-frequency circuit can further include a signal path implemented between each of the plurality of nodes and the common node. Each corresponding signal path can include a filter having a first Q-factor value and a respective resonator having a second Q-factor value higher than the first Q-factor value.