Transceiver Emission Current Adjustment for Impedance Matching
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Solution Overview
Problem
In high-speed Ethernet applications, existing transceivers often fail to maintain impedance matching and default electrical characteristics, leading to transmission issues due to varying resistance values in transmission lines, which can result in suboptimal output voltages.
Innovation Solution
A transceiver with a variable resistor set, a transmitter module, and a digital signal processor that uses a lookup table to adjust emission current based on the resistance value of the transmission line, ensuring impedance matching and maintaining output voltage within a fixed value or acceptable range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed default current value is used in the transmitter module, then the device complexity is reduced, but the impedance matching deteriorates when transmission line resistance deviates from the ideal value
Solution Approach 1:
The patent applies the dynamics principle by replacing the fixed default current value with a dynamic current value that is adjusted according to the actual resistance value of the transmission line. The digital signal processor modifies the emission current based on feedback about the transmission line's resistance, enabling the transmitter to adapt to varying conditions and maintain impedance matching without increasing hardware complexity
Solution Approach 2:
The patent implements feedback by using the digital signal processor to detect or determine the resistance value of the transmission line and accordingly adjusting the emission current. This closed-loop approach ensures that the transmitter automatically compensates for resistance variations, maintaining reliable impedance matching while keeping the transmitter module itself relatively simple
2Ease of operation
If the emission current is not adjusted according to transmission line resistance, then the ease of operation is improved, but the transmission quality deteriorates due to impedance mismatch
Solution Approach 1:
The patent applies the self-service principle by enabling the transceiver to automatically adjust its own emission current based on the transmission line's resistance characteristics. The digital signal processor monitors the transmission conditions and self-corrects the transmitter's output, eliminating the need for manual intervention or complex external control while maintaining high transmission quality
Solution Approach 2:
The patent implements parameter changes by dynamically modifying the emission current parameter according to the transmission line's resistance value. The digital signal processor adjusts the current parameter in real-time based on detected resistance variations, thereby optimizing transmission quality without requiring changes to the overall system configuration or operation procedure
3Adaptability or versatility
If a variable resistor set is added to adjust resistance, then the adaptability to different transmission lines is improved, but the device complexity increases
Solution Approach 1:
The patent applies the mechanics substitution principle by replacing the mechanical/physical approach of using a variable resistor set with a digital control approach. Instead of physically adjusting resistance with variable resistors, the system uses a digital signal processor to electronically adjust the emission current based on resistance detection, achieving the same adaptability with significantly reduced hardware complexity
Solution Approach 2:
The patent implements parameter changes by using the digital signal processor to dynamically modify the emission current parameter according to the transmission line's resistance characteristics. This digital parameter adjustment approach provides the necessary adaptability to different transmission lines while avoiding the need for physical variable resistor components, thereby maintaining device simplicity
Data Source
AI summary
The present invention provides a transceiver. The transistor is coupled to a transmission line. The transceiver includes a variable resistor set, a transmitter module, a receiver module, and a digital signal processor. The transmitter module has an output terminal coupled to the variable resistor set and the transmission line. The transmitter module includes a first digital-to-analog converter configured to output an emission current. The receiver module has an input terminal coupled to the transmitter module and the transmission line. When the emission current is fed into the transmission line, a far-end echo is fed into the receiver module. An amplitude of the far-end echo is associated with a resistance value of the transmission line. The digital signal processor adjusts a current value of the emission current from a first default current value to a second default current value based on the amplitude of the far-end echo.