Switched Antenna Multiplexer Impedance Compensation Using Inactive Filters
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Solution Overview
Problem
Existing switched antenna multiplexer applications face challenges in maintaining consistent in-band performance across different modes of operation due to variations in filter networks, leading to increased costs and losses from additional matching components and capacitive loading.
Innovation Solution
Implementing a control circuit to selectively couple and decouple transceiver circuits with filter networks, using inactive transceiver chains for impedance compensation, ensuring consistent impedance at the antenna by activating filter networks for active transceiver chains and deactivating them for inactive chains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an additional switched-in matching network is used to improve in-band performance, then the in-band performance of filter paths is improved, but the device complexity and area increase due to additional matching components and switch arms
Solution Approach 1:
The patent makes the filter network perform self-compensation by utilizing its own non-operational bands to provide impedance matching for operational bands. The filter network compensates for its own performance variations without requiring external matching components, thereby improving in-band performance while avoiding additional device complexity
Solution Approach 2:
The filter network is designed to serve multiple functions: filtering signals in operational bands and simultaneously providing impedance compensation for those same bands using its non-operational bands. This multi-functionality eliminates the need for separate matching networks, reducing device complexity while maintaining performance
2Reliability
If an additional switched-in matching network is used to improve in-band performance, then the in-band performance of filter paths is improved, but the area on the laminate increases due to additional matching components
Solution Approach 1:
The filter network uses its own non-operational bands to provide impedance compensation, eliminating the need for external matching components that would occupy additional laminate area. This self-service approach maintains performance while reducing physical footprint
Solution Approach 2:
The patent combines the filtering function and impedance matching function into a single filter network structure. By merging these functions, the design eliminates separate matching components, thereby reducing the total area required on the laminate
3Reliability
If an additional switch arm is added to the antenna switch, then the in-band performance is improved through compensation, but the die size for the multiplexing switch device increases
Solution Approach 1:
The filter network autonomously provides impedance compensation using its non-operational bands, eliminating the need for additional switch arms in the antenna switch. This reduces the complexity and die size of the multiplexing switch device while maintaining performance improvements
4Reliability
If an additional switch arm is added to the antenna switch, then the in-band performance is improved through compensation, but the losses increase due to capacitive loading on other paths
Solution Approach 1:
The filter network provides self-compensation without requiring additional switch arms, thereby avoiding the capacitive loading that would increase losses on other signal paths. The compensation is achieved internally within the filter network structure
Solution Approach 2:
The patent extracts the compensation function from the switch network and places it within the filter network itself. By removing the need for additional switch arms, the design eliminates the harmful capacitive loading effect that would otherwise increase energy losses
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
Improves in-band performance and reduces losses by providing consistent impedance at the antenna, eliminating the need for additional matching components and switch arms, thus optimizing carrier aggregation.
Implementation Method 1
a first filter network and first downstream/upstream RF circuitry... a second filter network and second downstream/upstream RF circuitry
Implementation Method 2
a switch device connected to an antenna, wherein the switch device is configured to selectively couple and selectively decouple the first transceiver circuit and the second transceiver circuit to the antenna
Implementation Method 3
the second filter network provides a capacitive response within the first frequency range... generate the second control output such that the second downstream/upstream RF circuitry is non-operational with the second filter network
Data Source
AI summary
Systems and methods of operating radio frequency (RF) front-end circuitry are disclosed. In some embodiments, the RF front-end circuitry has various transceiver circuits. Each of the transceiver circuits includes a filter network and downstream/upstream circuitry coupled to the filter network. During carrier aggregation, the downstream/upstream circuitry of several transceiver circuits may be activated and selectively coupled to an antenna. In addition, transceiver circuits with deactivated downstream/upstream circuitry may also be selectively coupled to the antenna. In this manner, filter networks in transceiver circuits with deactivated downstream/upstream circuitry can be utilized for impedance compensation and impedance matching.