Ethernet Transmitter Driver Architecture for Large 10BASE-T Output Swing
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Solution Overview
Problem
Traditional drivers for Ethernet transmitters fail to meet the output swing requirements in 10BASE-T mode due to large area and high-frequency return loss, caused by the collaboration of voltage and current mode drivers which require multiple operational amplifiers, leading to inefficient impedance matching.
Innovation Solution
A driver architecture with a signal conversion module and two driving modules, each comprising voltage driving units and impedance matching units, converts differential current signals into voltage signals and adjusts their swing to meet the output impedance matching requirements of Ethernet receivers, allowing for a smaller area implementation and meeting the 10BASE-T mode output swing requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If voltage mode driver and current mode driver collaborate to increase output swing, then output swing is improved, but device area increases significantly
Solution Approach 1:
The patent merges the voltage mode driver and current mode driver into a single integrated driver structure. The operational amplifier outputs both control the voltage driving unit and current driving unit, which share common input terminals and work in parallel to drive the transmission line. This integration achieves the collaborative effect of both driving modes while occupying the area of only one operational amplifier rather than two separate amplifiers.
Solution Approach 2:
The single operational amplifier in the patent serves multiple functions: it generates voltage output signals for the voltage driving unit and current output signals for the current driving unit simultaneously. The amplifier's output is distributed to both parallel driving paths, making it a multi-functional component that replaces what would traditionally require two separate amplifiers, thereby reducing the overall driver area.
2Power
If voltage mode driver and current mode driver are used together, then output swing is improved, but high-frequency return loss increases
Solution Approach 1:
By merging the voltage and current mode drivers into a single integrated structure with shared operational amplifier inputs and parallel output paths, the patent reduces the overall circuit area. This consolidation minimizes the parasitic inductance and capacitance associated with separate driver implementations, thereby reducing high-frequency return loss while maintaining the collaborative output swing enhancement.
3Area of stationary object
If traditional driver architecture is used, then device area is reduced, but output swing requirement in 10BASE-T mode is not met
Solution Approach 1:
The patent implements dynamic switching between different driving modes through control signals. The switching unit can dynamically connect or disconnect the voltage driving unit and current driving unit based on the required output swing. In 10BASE-T mode, both driving units are activated to achieve large output swing, while in other modes, only the necessary unit is activated, optimizing performance for each specific application.
Solution Approach 2:
The patent employs periodic switching between voltage mode and current mode operation based on the Ethernet transmission mode requirements. The switching unit responds to mode selection signals to periodically activate the appropriate driving configuration, enabling the driver to adapt its output characteristics to match the specific requirements of 10BASE-T, 100BASE-TX, or 1000BASE-T modes.
Data Source
AI summary
Disclosed is a driver of an ethernet transmitter and a control method therefor. The driver has a first output port and a second output port connected to an ethernet receiver through a transmission line, and comprises: a signal conversion module for converting differential current signals into a first voltage signal and a second voltage signal; a first driving module adjusting a swing of the first voltage signal, to obtain a first output signal having a voltage equal to the first voltage signal; a second driving module adjusting a swing of the second voltage signal, to obtain a second output signal having a voltage equal to the second voltage signal. An architecture having a relatively small area is realized, and the ethernet transmitter meets the requirement on a large output swing in 10BASE-T mode.