MUX Switching Array for Low-Parasitic Analog Signal Routing
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Solution Overview
Problem
Medical systems that acquire and route multiple analog signals through numerous electrical leads suffer from signal distortion due to high parasitic capacitance, which reduces the quality and reliability of processed signals.
Innovation Solution
An electronic device with a multiplexer (MUX) and a switching array that selectively connects only the desired signal to the output, disconnecting all other input signals to minimize parasitic capacitance, thereby reducing signal distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple electrical leads are connected to the MUX input ports, then the system can acquire multiple input signals simultaneously, but the total parasitic capacitance at the MUX increases causing signal distortion
Solution Approach 1:
The patent introduces a switching array that segments the connection between multiple electrical leads and the MUX input ports. Instead of having all leads permanently connected to the MUX, the switching array divides the connection into discrete, controllable segments where only the selected lead is connected at any given time. This segmentation allows the system to maintain the capability to acquire multiple signals while reducing parasitic capacitance by isolating unused connections.
Solution Approach 2:
The patent implements dynamic control of the switching array based on the MUX selection signal. The switching array dynamically reconfigures its connections in real-time to match the MUX input selection, ensuring that only the currently selected electrical lead remains connected to the MUX. This dynamic adaptation allows the system to optimize signal quality for each selected input while maintaining the ability to monitor multiple signals sequentially.
2Stability of the object's composition
If all electrical leads remain connected to the MUX, then connection stability is maintained, but signal quality deteriorates due to high parasitic capacitance
Solution Approach 1:
The patent introduces the switching array as an intermediary component between the electrical leads and the MUX input ports. This intermediary dynamically controls which leads are connected to the MUX based on the selection signal, acting as a gatekeeper that maintains connection stability for the selected lead while isolating unused leads to reduce parasitic capacitance. The switching array mediates between the need for stable connections and the need for low parasitic capacitance.
3Device complexity
If a conventional MUX is used without additional switching circuitry, then device complexity is low, but signal distortion occurs due to cumulative parasitic capacitance from all connected leads
Solution Approach 1:
The patent merges the switching array functionality with the MUX structure, creating an integrated solution where the switching array and MUX work together as a unified signal routing system. The switching array is positioned immediately before the MUX input ports, combining the functions of selective connection and signal multiplication in a single integrated architecture. This merging approach reduces signal distortion while maintaining relatively low device complexity through efficient spatial arrangement and functional integration.
Data Source
AI summary
An electronic device includes a multiplexer (MUX), a switching array and logic circuitry. The MUX includes multiple input ports and an output port, and is configured to receive, via the input ports, multiple input signals, and to output, via the output port, a selected signal among the input signals. The switching array is coupled to the input ports of the MUX and is configured to receive the input signals and to connect or disconnect between each input signal and a respective input port. The logic circuitry is electrically coupled to the switching array and to the MUX, and is configured to control the switching array to connect at least the selected signal that the MUX is outputting, and to disconnect all the input signals other than the at least selected signal.