Multi-Level Signal Transmission with Transition-Based De-Emphasis
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Solution Overview
Problem
Current communication systems face challenges in improving communication performance at high-speed interfaces, particularly in managing data transmission with multiple devices in electronic apparatuses, where existing techniques like pre-emphasis and multi-path transmission do not fully address the need for enhanced signal quality and efficiency.
Innovation Solution
A transmission device and method that utilize a driver section and control section to transmit data signals using three or more voltage states, setting emphasis voltages based on transitions among these states to perform de-emphasis, thereby improving communication performance by optimizing signal transmission through the use of three output terminals and corresponding input terminals connected via transmission paths with specific impedance characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pre-emphasis is applied to improve signal quality at high-speed interfaces, then communication performance is improved, but power consumption increases
Solution Approach 1:
The patent applies de-emphasis by changing voltage parameters based on transition patterns. The control section determines whether to apply de-emphasis by comparing current and previous voltage states, and adjusts the output voltage accordingly. This selective parameter adjustment improves communication performance while reducing unnecessary power consumption compared to continuous pre-emphasis.
Solution Approach 2:
The patent implements dynamic voltage adjustment by making the emphasis voltage variable based on transition detection. The driver section dynamically changes its output voltage level according to the detected transition state, rather than using a fixed emphasis level. This dynamic approach optimizes both signal quality and power efficiency.
2Productivity
If multiple voltage states are used to increase data transmission capacity, then productivity is improved, but signal integrity and communication performance may deteriorate
Solution Approach 1:
The patent uses multiple voltage states (first voltage state and second voltage state) to encode data, increasing transmission capacity. The control section monitors transitions between these states and applies de-emphasis selectively during transitions to maintain signal integrity. This approach allows high-speed data transmission while preserving signal quality through adaptive voltage management.
3Reliability
If emphasis voltage is applied continuously to maintain signal quality, then communication performance is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic de-emphasis application by detecting transitions between voltage states and applying de-emphasis only during these transitions. The control section continuously monitors the voltage state and triggers de-emphasis periodically when needed, rather than applying it continuously. This periodic action maintains signal quality during critical transitions while reducing overall power consumption.
Solution Approach 2:
The system uses its own voltage state information to control the de-emphasis application. The control section determines when de-emphasis is needed by comparing current and previous voltage states, making the system self-regulating. This self-service mechanism ensures de-emphasis is applied only when necessary for signal integrity, avoiding unnecessary power consumption.
Data Source
AI summary
A transmission device according to the disclosure includes a driver section that is able to transmit a data signal by using three or more predetermined number of voltage states and set voltages in each of the voltage states; and a control section that sets an emphasis voltage that is based on a transition among the predetermined number of the voltage states, and thereby causes the driver section to perform emphasis.