SAW Filter Switching Circuit for Integrated Frequency Band Selection
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Solution Overview
Problem
Current radio communication systems, such as LTE and IEEE 802.16m, face challenges in integrating signals from Surface Acoustic Wave (SAW) filters, leading to increased unit costs and hardware space due to the need for one-to-one connections between SAW filters and Radio Frequency Integrated Circuits (RFICs).
Innovation Solution
A switching circuit and method that combines output signals from multiple SAW filters using Single-Pole n Throw (SPnT) and Dual-Pole n Throw (DPnT) switches, along with combiners, to select and integrate frequency bands, thereby satisfying threshold attenuation and isolation requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If one-to-one connections between SAW filters and RFICs are used, then signal integration is achieved, but unit cost and hardware space increase
Solution Approach 1:
The patent combines multiple SAW filter outputs through a common RFIC interface using switching circuits and combiners. Instead of requiring separate RFIC connections for each SAW filter, the system merges multiple filter signals into a single integrated path, reducing hardware space while maintaining signal integration capability.
Solution Approach 2:
The RFIC is designed to handle multiple frequency bands and filter outputs through a universal interface. The switching circuit enables a single RFIC to serve multiple SAW filters by dynamically routing signals, making the RFIC multi-functional rather than requiring dedicated RFICs for each filter.
2Reliability
If one-to-one connections between SAW filters and RFICs are used, then signal integration is achieved, but production cost increases
Solution Approach 1:
The patent merges multiple SAW filter signals through a common RFIC path, reducing the total number of RFIC components needed. This consolidation lowers production costs by reducing component count and assembly complexity while maintaining the ability to integrate signals from multiple filters.
Solution Approach 2:
By designing the RFIC with universal multi-functionality to handle multiple frequency bands and filter outputs, the system reduces the number of RFIC units required. This multi-functional approach decreases unit cost through economies of scale and reduced manufacturing complexity.
3Device complexity
If multiple SAW filters are integrated through switching circuits, then hardware space is minimized, but signal attenuation and isolation requirements become more challenging
Solution Approach 1:
The patent introduces combiners as intermediary components between the switching circuit and the RFIC. These combiners are specifically designed to provide the necessary attenuation and isolation between different filter signals, ensuring that space-saving integration does not compromise signal quality. The combiners act as mediators that manage signal interactions in the integrated architecture.
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 solution reduces production costs and minimizes hardware space by effectively integrating signals from SAW filters, ensuring efficient frequency band selection and meeting attenuation and isolation requirements, while allowing for flexible frequency band selection in radio communication systems.
Implementation Method 1
a plurality of Surface Acoustic Wave (SAW) filters 320-1 to 320-8
Implementation Method 2
Surface Acoustic Wave (SAW) filters
Data Source
AI summary
A switching circuit is provided. The switching circuit includes at least one Surface Acoustic Wave (SAW) filter, a Single-Pole n Throw (SPnT) switch connected to an input port of each of the at least one SAW filter, and a Dual-Pole n Throw (DPnT) switch connected to an output port of each of the at least one SAW filter.