Switch Matrix Topology With Fewer RF Routing Layers and Vias
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Solution Overview
Problem
Existing switch matrix designs for routing high frequency signals require a large number of routing layers and via transitions, leading to increased signal losses, circuit board complexity, and cost.
Innovation Solution
A switch matrix topology that reduces the number of routing layers and via transitions by arranging signal dividers on two sides of a column of switches, with switches positioned centrally, allowing for efficient routing of signals without significant cross-overs and minimizing the number of layers required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional switch matrix routing layout is used, then complete signal routing functionality is achieved, but number of routing layers and via transitions increases
Solution Approach 1:
The patent applies dimensionality change by transitioning from a planar two-dimensional routing layout to a three-dimensional folded routing layout. The routing path is folded back on itself within the same physical layer, utilizing vertical space and creating multiple routing planes within a single layer. This allows multiple signal paths to coexist without requiring additional routing layers, thereby reducing device complexity while maintaining complete signal routing functionality.
2Adaptability or versatility
If traditional switch matrix routing layout is used, then complete signal routing functionality is achieved, but signal losses increase
Solution Approach 1:
The patent extracts the harmful element of via transitions from the routing path by implementing a via-less folded routing layout. By eliminating vias and their associated discontinuities, the design removes a major source of RF signal loss. The folded routing achieves complete signal routing functionality through planar conductor traces alone, extracting the problematic via component from the signal path while maintaining routing capability.
3Adaptability or versatility
If traditional switch matrix routing layout is used, then complete signal routing functionality is achieved, but circuit board complexity and cost increase
Solution Approach 1:
The patent merges multiple routing functions into a single routing layer by implementing folded routing. Instead of requiring separate layers for different signal paths, the folded routing consolidates multiple routing planes and signal paths within one layer, using the same physical infrastructure to achieve what traditionally required multiple layers. This merging reduces circuit board complexity and associated costs while maintaining complete signal routing functionality.
Data Source
AI summary
A switch matrix structure for planar circuitry such as printed circuit boards and integrated circuits includes a plurality of signal dividers and a plurality of switches. Each signal divider is configured to receive a corresponding input signal and generate a corresponding plurality of divider output signals. Each switch is configured to receive a corresponding divider output from a corresponding signal divider. Each switch is configured to provide a corresponding output signal such that a plurality of output signals are generated by the plurality of switches. In an example, the plurality of switches are arranged in a column, with a first subset of the plurality of signal dividers on a first side of the column, and a second subset of the plurality of signal dividers on a second side of the column. In an example, such a routing configuration reduces a number of routing layers and/or a number of via transitions.