Multi-Standard Ethernet Line Transceiver With Dynamic Impedance Matching
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Solution Overview
Problem
Conventional line transceiver apparatuses face challenges in supporting multiple Ethernet transmission standards due to difficulties in adjusting transmission gain and output impedance, leading to issues with reflective noise and power transfer efficiency.
Innovation Solution
A line transceiver apparatus with a variable resistor control unit that adjusts the impedance of multiple variable resistor units to match different transmission standards, using a transformer unit with a 1:1 turns ratio to reduce costs and enhance compatibility across various Ethernet standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a transformer unit with adjustable turns ratio is used to support multiple transmission standards, then the adaptability to different standards is improved, but the device complexity and cost increase
Solution Approach 1:
The patent applies the Dynamics principle by making the resistor values dynamically adjustable through a variable resistor control unit. Instead of using a complex transformer with adjustable turns ratio, the invention dynamically changes the resistance values of several resistors (R1, R2, R3, R4, R5, R6) to adapt to different transmission standards (10BASE-T, 100BASE-T, 1000BASE-T), thereby reducing device complexity while maintaining adaptability.
Solution Approach 2:
The patent applies the Parameter changes principle by changing the electrical parameters (resistance values) of the resistors to match different transmission standards. The variable resistor control unit adjusts the resistance values of R1-R6 based on the detected transmission standard, enabling the line transceiver apparatus to support multiple standards without requiring complex hardware changes.
2Manufacturing precision
If fixed resistor values are used in the transmission gain circuit, then the manufacturing precision is improved, but the adaptability to different transmission standards deteriorates
Solution Approach 1:
The patent resolves this contradiction by making the resistor values dynamic rather than fixed. The variable resistor control unit enables the resistors to maintain consistent manufacturing precision for their respective impedance values while allowing the system to adapt to different transmission standards by switching between predetermined impedance combinations.
Solution Approach 2:
The patent applies the Universality principle by designing a single line transceiver apparatus that can function across multiple transmission standards (10BASE-T, 100BASE-T, 1000BASE-T) through the variable resistor control unit. This universal design allows the same hardware circuit to serve multiple functions by adjusting resistor impedances according to the detected standard.
3Loss of energy
If transformer units with different turns ratios are used for different standards, then the power transfer efficiency is improved, but the device complexity and cost increase
Solution Approach 1:
The patent applies the Dynamics principle by using a single transformer unit with dynamic resistor adjustment instead of multiple transformer units with different turns ratios. The variable resistor control unit adjusts the resistor values to optimize power transfer efficiency for each transmission standard, eliminating the need for multiple physical transformer units and reducing device complexity.
Data Source
AI summary
A line transceiver apparatus for multiple transmission standards including a operational amplifier (OP-AMP), a transformer unit, a first variable resistor unit to a sixth variable resistor unit, and a variable resistor control unit is provided. The first resistor and the second resistor are coupled between transmission nodes of the line transceiver apparatus and input nodes of the OP-AMP, and the load nodes of the transformer unit are receiving nodes of the line transceiver apparatus. The variable resistor control unit adjusts the impedances of the first variable resistor unit to the sixth variable resistor unit according to a transmission standard selection signal so as to enable the line transceiver apparatus to support multiple transmission standards.