RF Front-End Switching for Shared Impedance Matching in Carrier Aggregation
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Solution Overview
Problem
Conventional radio frequency front end circuits require separate impedance matching circuits for each filter, leading to size increase and loss due to impedance deviation during Carrier Aggregation, especially when selecting multiple filters.
Innovation Solution
A radio frequency front end circuit with a switch circuit that dynamically switches between connection forms, utilizing a single impedance element to function as an impedance matching circuit for different filter configurations, reducing the number of elements and minimizing loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate impedance matching circuits are provided for each filter, then impedance matching can be achieved for each filter configuration, but the circuit size increases
Solution Approach 1:
A single impedance matching circuit is designed to serve multiple filter configurations through dynamic reconfiguration. The circuit can be switched between different connection forms (series/parallel) and impedance values to match various filter combinations, eliminating the need for separate matching circuits for each filter while maintaining effective impedance matching across all configurations
Solution Approach 2:
The impedance matching circuit incorporates switching elements that allow dynamic reconfiguration between different connection forms and impedance states. This enables the circuit to adapt its characteristics based on which filters are currently selected and connected, providing optimal impedance matching for single-filter and multi-filter configurations without requiring multiple static matching circuits
2Adaptability or versatility
If multiple filters are selected during Carrier Aggregation, then multiple frequency bands can be transmitted or received simultaneously, but impedance deviation occurs increasing loss
Solution Approach 1:
The impedance matching circuit dynamically switches between different connection forms (series/parallel) and impedance states based on the number of filters connected. When multiple filters are selected for Carrier Aggregation, the circuit reconfigures to provide appropriate impedance matching, preventing impedance deviation and minimizing signal loss across all operating conditions
3Adaptability or versatility
If the number of filters selected changes, then different frequency bands can be used, but impedance deviation is caused compared to single filter configuration
Solution Approach 1:
The impedance matching circuit incorporates switching elements that enable dynamic reconfiguration between different connection forms and impedance states. This allows the circuit to adapt its characteristics based on whether one or multiple filters are connected, maintaining effective impedance matching across all filter selection scenarios without degradation
Solution Approach 2:
A single impedance matching circuit is designed to handle both single-filter and multi-filter configurations through dynamic reconfiguration. The circuit can switch between different connection forms and impedance values to match various filter combinations, providing universal impedance matching capability that maintains reliability regardless of the number of filters selected
Data Source
AI summary
A radio frequency front end circuit includes a switch circuit, duplexers, and a capacitor. The switch circuit includes a main switch that switches connection between a common terminal and a selection terminal, a sub-switch that switches connection between the selection terminal and the ground according to exclusive ON and OFF relative to the main switch, a main switch that switches connection between the common terminal and a selection terminal, and a sub-switch that switches connection between the selection terminal and the ground according to exclusive ON and OFF relative to the main switch. The switch circuit is switched between a first connection form in which only one of the main switches is ON and a second connection form in which both the main switches are ON. The capacitor allows connection between the selection terminal and the selection terminal.