Differential Signaling with Multi-Level References for Higher Bandwidth
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Solution Overview
Problem
Conventional differential signal transmission systems require multiple pairs of transmission lines to achieve high bandwidth, leading to increased space and cost due to their inability to transmit multiple bits simultaneously over a single pair of lines.
Innovation Solution
A differential signal transmission system utilizing multiple reference signal supplies and switches, where the controller couples transmission ends to these supplies to enable each line to carry a corresponding reference signal, ensuring the sum of signal differences among the transmission ends is zero, allowing for efficient transmission of multiple bits over fewer lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple pairs of transmission lines are used to increase data transmission bandwidth, then the bandwidth requirement is met, but the space and cost increase
Solution Approach 1:
The patent combines multiple differential signal pairs into a single transmission line by superimposing multiple reference signals with different frequencies onto the same line. This allows multiple bits of data to be transmitted simultaneously over one line instead of requiring separate lines for each bit, thereby increasing bandwidth while reducing the number of transmission lines needed
Solution Approach 2:
The transmission line is made multi-functional by enabling it to carry multiple reference signals with different frequencies simultaneously. Each reference signal serves a different data transmission purpose, allowing the single line to perform multiple data transmission functions that would traditionally require multiple dedicated lines
2Productivity
If multiple pairs of transmission lines are used to achieve high bandwidth, then the bandwidth requirement is met, but the cost increases
Solution Approach 1:
The patent combines multiple differential signal pairs into a single transmission line by superimposing multiple reference signals with different frequencies onto the same line. This allows multiple bits of data to be transmitted simultaneously over one line instead of requiring separate lines for each bit, thereby increasing bandwidth while reducing the number of transmission lines needed
Solution Approach 2:
The transmission line is made multi-functional by enabling it to carry multiple reference signals with different frequencies simultaneously. Each reference signal serves a different data transmission purpose, allowing the single line to perform multiple data transmission functions that would traditionally require multiple dedicated lines
3Reliability
If conventional differential signal transmission is used, then noise resistance is maintained, but the ability to transmit multiple bits simultaneously is limited
Solution Approach 1:
The patent segments the data transmission by assigning different frequency references to represent different data values (e.g., first reference for '0', second reference for '1'). This segmentation allows multiple bits to be transmitted simultaneously over the same line by using frequency division, while each segmented signal maintains the noise resistance properties of differential signaling
Solution Approach 2:
The patent introduces a frequency dimension to the traditional differential signal transmission. Instead of only varying voltage levels as in conventional differential signaling, the system now varies both voltage and frequency, allowing additional data dimensions to be encoded. This enables multiple bits to be transmitted simultaneously while maintaining noise resistance through the differential signaling mechanism
Data Source
AI summary
A differential signal transmission system includes m different voltage/current supplies, n transmission end, and a controller. The controller includes m×n switches. Each of the switches is coupled between a voltage/current supply and a transmission end. The controller controls the switches to turn on or off for coupling each transmission end to one of the different voltage/current supplies so as to carry the voltage of the coupled voltage supply onto the transmission end according to the transmitting data. The sum of the voltage differences among the transmission ends is 0.