Differential Driver Timing Control for Multi-Level Noise Suppression
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Solution Overview
Problem
Existing transmission devices face challenges in suppressing common mode noise when transmitting differential signals with multiple signal levels, as fixed timing adjustments are inadequate for reducing noise across all transition states.
Innovation Solution
A transmission device with a driver circuit, timing adjustment circuits, and a control circuit that dynamically adjusts the set values of timing setting signals based on the transition states of output signals to minimize common mode noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed timing adjustment is used in the driver circuit, then the device complexity is reduced, but the ability to suppress common mode noise across all transition states deteriorates
Solution Approach 1:
The patent implements dynamic timing adjustment by changing the set values of timing setting signals based on the transition states of output signals. Instead of using a fixed timing adjustment, the system dynamically adapts the timing of driver input signals to match different signal level transitions, thereby suppressing common mode noise effectively across all transition states while maintaining manageable device complexity through controlled variability.
2Loss of information
If the number of signal levels in the differential signal is increased to four or more values, then the information transmission capacity is improved, but the difficulty of suppressing common mode noise in all transition states increases
Solution Approach 1:
The patent changes the timing parameters of driver input signals according to different transition states of the differential signal. When the differential signal has four or more signal levels, the system adjusts the timing parameters dynamically to ensure that common mode noise is suppressed across all possible transition states, thereby maintaining high information transmission capacity while effectively controlling noise.
3Ease of operation
If a fixed timing adjustment is used, then the ease of operation is improved, but the communication performance deteriorates
Solution Approach 1:
The patent employs a feedback mechanism where the timing adjustment is based on the transition states of the output signals. The system monitors the signal levels and adjusts the timing of driver input signals accordingly, creating a closed-loop control that optimizes communication performance while maintaining ease of operation through automated adjustment.
Data Source
AI summary
A transmission device according to the present disclosure includes: a driver circuit that includes a plurality of output circuits each including a plurality of transistors, and outputs a plurality of output signals from the plurality of output circuits on a basis of a plurality of driver input signals being respectively inputted to the plurality of transistors, the plurality of output signals configuring a differential signal and having signal levels that are different from each other; a plurality of timing adjustment circuits that each adjusts, on a basis of a timing setting signal, an input timing of corresponding one of the plurality of driver input signals to the driver circuit; and a control circuit that changes a set value of the timing setting signal for each of the plurality of timing adjustment circuits to a value corresponding to a plurality of transition states of possible signal levels of each of the plurality of output signals to be outputted from the driver circuit.