RF Switch Assembly Shared Common Node Topology
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Solution Overview
Problem
Conventional RF switches in wireless communication devices face challenges in meeting performance requirements due to increased footprint and cost from additional components and circuitry, which also degrade isolation performance.
Innovation Solution
A radio-frequency switch assembly with a shared common node and shunt inductance or capacitance to compensate for parasitic capacitance, minimizing the need for multiple inductors and optimizing signal paths, while maintaining improved isolation through a reduced footprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional approaches use additional components and circuitry to meet performance requirements, then switch performance is improved, but footprint and device size increase significantly
Solution Approach 1:
The patent combines multiple inductors into a shared inductor that is coupled to the common node, serving multiple switch paths simultaneously. This merging approach reduces the total number of discrete inductor components needed while maintaining the required performance characteristics for each signal path, thereby reducing overall footprint without sacrificing switch performance.
Solution Approach 2:
The shared inductor at the common node performs multiple functions: it provides impedance matching and signal coupling for multiple different switch paths (e.g., SPDT, DPDT configurations). This multi-functional component replaces what would traditionally require separate inductors for each path, reducing component count and footprint while maintaining performance.
2Reliability
If conventional approaches use additional components and circuitry, then switch performance is improved, but device complexity increases
Solution Approach 1:
By merging multiple inductor functions into a single shared inductor at the common node, the patent reduces the total component count and simplifies the circuit topology. This approach maintains the ability to support multiple switch configurations (SPDT, DPDT) while reducing device complexity compared to using separate inductors for each switch path.
Solution Approach 2:
The patent segments the inductor functionality by placing it at the common node where it can serve multiple paths, rather than requiring distributed inductors throughout the circuit. This strategic segmentation of the circuit architecture reduces overall complexity while maintaining performance.
3Reliability
If conventional approaches use additional components and circuitry, then switch performance is improved, but isolation performance degrades
Solution Approach 1:
The shared inductor topology reduces the number of discrete components and ground connections required, thereby minimizing leakage paths between different signal paths. By consolidating the inductive coupling at the common node, the design achieves better isolation performance while maintaining the necessary switch performance characteristics.
Solution Approach 2:
The patent extracts the inductor components from individual switch paths and consolidates them at the common node. This extraction and repositioning eliminates unnecessary leakage paths that would exist with distributed inductors, thereby improving isolation performance while maintaining signal integrity.
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 solution reduces the size and cost of RF switch assemblies, enhances performance by optimizing signal paths, and improves isolation by minimizing leakage paths and extra ground connections, allowing for efficient operation across various frequency bands.
Implementation Method 1
a value of the shunt inductance is based at least in part on the first signal frequency. In some embodiments, the shunt inductance is configured to provide optimal compensation for a combined parasitic capacitance of the plurality of input switches and the plurality of output switches at the first signal frequency.
Implementation Method 2
the shunt switch is turned on to couple the common node to the reference potential to improve isolation of the radio-frequency switch assembly
Data Source
AI summary
Systems and methods are provided herein that include an improved RF switch assembly. In at least one embodiment, the RF switch assembly may have an optimized topology including a common node shared by each signal path, reducing the size and cost of the RF switch assembly and providing improved performance.