LVDS Transmission Buffer Timing for In-Phase/Differential Switching
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Solution Overview
Problem
Existing LVDS signal transmission devices face challenges in increasing the speed of switching between in-phase and differential transmission, which is necessary for efficient signal propagation.
Innovation Solution
The proposed signal transmission device includes a transmission buffer with a differential circuit portion, a variable current source, a switch port, and a controller that controls the current supply and switch operations to optimize the switching speed between in-phase and differential transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the propagation delay of differential transmission and the transition time between in-phase and differential transmission are made equal, then the switching speed between in-phase and differential transmission is improved, but the device complexity increases due to the need for precise timing control
Solution Approach 1:
The patent adjusts the propagation delay parameter of the differential transmission path to match the transition time parameter, achieving equal timing through parameter optimization. This allows the switching operation to complete within one clock cycle without requiring complex control logic, thereby resolving the contradiction between switching speed and device complexity.
2Productivity
If the switching between in-phase and differential transmission is completed within one clock cycle, then the productivity of signal transmission is improved, but the reliability decreases due to the stringent timing requirements
Solution Approach 1:
The patent pre-configures the differential transmission path with a specific propagation delay that is equal to the transition time required for switching. This preliminary timing arrangement ensures that when switching occurs, the differential signal is already ready to be transmitted without requiring complex real-time synchronization, thus maintaining reliability while achieving high productivity.
Data Source
AI summary
A transmission buffer of a signal transmission device according to the embodiment includes: a differential circuit portion that is connected between the first potential and the second potential; a variable current source portion that supplies current to the differential circuit portion; a switch port that switches between a conductive state and a disconnected state between the first transmission terminal and the fixed potential and between the second transmission terminal and the fixed potential; and a controller that controls the current supplied by the variable current source portion to the differential circuit portion, and that controls the operation of the switch portion.