Voltage Transmission Circuit Using Segmented Multiplexer
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Solution Overview
Problem
Existing voltage transmission circuits that use elements with high withstand voltage for transmitting positive and negative polarities require larger chip area, increased wiring, and higher costs, as well as increased complexity in fabrication, due to the need for high-withstand-voltage elements and larger spacing between components.
Innovation Solution
A voltage transmission circuit that uses a multiplexer and demultiplexer to selectively transmit positive and negative voltages, with control signals within specific voltage ranges, allowing elements with lower withstand voltage to be used, thereby reducing the risk of withstand voltage violation and minimizing chip area and fabrication complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-withstand-voltage elements are used to transmit positive and negative voltages, then voltage transmission reliability is improved, but chip area increases and fabrication complexity increases
Solution Approach 1:
The voltage transmission circuit is segmented into separate positive voltage transmission path and negative voltage transmission path. The multiplexer selectively connects either the positive voltage source or negative voltage source to the output, ensuring that low-withstand-voltage elements only encounter voltages of one polarity at a time, thus maintaining reliability without requiring high-withstand-voltage elements throughout the entire circuit.
Solution Approach 2:
The circuit employs dynamic switching through the multiplexer to change the voltage polarity being transmitted based on control signals. This dynamic operation allows the same physical elements to safely handle both positive and negative voltages at different times, eliminating the need for static high-withstand-voltage design and reducing chip area.
2Reliability
If high-withstand-voltage elements are used to transmit positive and negative voltages, then voltage transmission reliability is improved, but fabrication complexity increases
Solution Approach 1:
The transmission circuit is divided into separate positive and negative voltage paths that are activated sequentially. This segmentation allows standard low-withstand-voltage elements to be used in each path, simplifying fabrication processes compared to using high-withstand-voltage elements throughout the entire circuit.
Solution Approach 2:
The circuit changes the operating parameters of the transmission elements by controlling the voltage polarity through the multiplexer. Elements operate within their safe voltage ratings by only being exposed to one polarity at a time, enabling use of simpler, more easily manufactured low-withstand-voltage elements.
3Reliability
If larger spacing between components is used to accommodate high-withstand-voltage elements, then voltage transmission reliability is improved, but chip area increases
Solution Approach 1:
The circuit dynamically switches between positive and negative voltage transmission modes, allowing compact element placement since each element only needs to withstand one polarity at a time. This eliminates the need for large spacing requirements that would be necessary if high-withstand-voltage elements were used throughout the circuit.
Data Source
AI summary
The voltage transmission circuit includes: a multiplexer for transmitting positive and negative voltages ranging +VDD to −VDD selectively; and a demultiplexer for receiving the positive and negative voltages and output them at positive and negative outputs. The voltage transmission circuit is arranged by use of elements each having a withstand voltage of which the absolute value is not 2|VDD|, but |VDD|. While transmitting positive voltages, the multiplexer is configured not to be applied by negative voltages, the multiplexer and demultiplexer are controlled by signals each having a potential of 0 V to +VDD, and the demultiplexer outputs the positive voltages at the positive output. While transmitting negative voltages, the multiplexer is configured not to be applied by positive voltages, the multiplexer and the demultiplexer are controlled by signals each having a potential of −VDD to 0 V, and the demultiplexer outputs the negative voltages at the negative output.