DPDT Switch Circuit Topology for High-Frequency Signal Isolation
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Solution Overview
Problem
Conventional double pole double throw switch devices face insufficient isolation capacity, particularly at high frequencies, and require a large number of control signals to operate effectively.
Innovation Solution
The proposed double pole double throw switch device incorporates four path circuits with switch modules and functional switch circuits, where switch modules and functional switch circuits are toggled based on control signals to achieve efficient signal isolation across different frequency bands, utilizing series and parallel configurations of switch elements and capacitors to enhance isolation capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If switches TSW5-TSW8 in the parallel connection path are removed to scale down the area and reduce control signals, then device area and control signal amount are reduced, but isolation capacity becomes insufficient
Solution Approach 1:
The patent segments the switch device into four independent path circuits (first, second, third, and fourth path circuits), each handling specific signal paths. This segmentation allows the device to achieve sufficient isolation capacity with fewer switches by dedicating each path circuit to specific port combinations, thereby resolving the contradiction between reduced device area and maintained isolation capacity.
2Reliability
If eight switches TSW1-TSW8 are used to ensure sufficient isolation capacity, then isolation capacity is maintained, but device area and control signal amount increase
Solution Approach 1:
The patent merges the functions of multiple switches into four path circuits, where each path circuit integrates series and parallel switch configurations. This merging reduces the total switch count from eight to four while maintaining isolation capacity, thereby reducing device complexity and control signal requirements without sacrificing reliability.
3Reliability
If four path circuits with switch modules and functional switch circuits are implemented to improve high frequency isolation, then signal isolation capacity is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic switch configurations within each path circuit, where switch modules and functional switch circuits are toggled based on control signals. This dynamic operation allows the device to adaptively optimize signal isolation capacity at high frequencies while maintaining manageable device complexity through systematic control of the four path circuits.
Data Source
AI summary
A double pole double throw switch device is provided. The device includes a first path circuit, a second path circuit, a third path circuit and a fourth path circuit. The first terminals of the first and second path circuits are coupled to a first port, and the second terminals of the first and second path circuits are respectively coupled to a third port and a fourth port. The first terminals of the third and fourth path circuits are coupled to a fourth port, and the second terminals of the third and fourth path circuits are respectively coupled to the second port and the third port. Each path circuit includes a switch module and a functional switch circuit. When a switch module is turned on, its corresponding functional switch circuit is turned off, and when the switch module is turned off, its corresponding functional switch circuit is turned on.