Differential Driver Steep Rise Fall Times
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Solution Overview
Problem
High-speed data transmission in mobile devices generates electromagnetic interference that affects cellular receivers, leading to common-mode noise due to differential signal characteristics such as rise and fall times that are not adequately managed by existing technologies.
Innovation Solution
A differential driver module with at least two switching modules is used to generate differential signals with steep rise and fall times, ensuring these times are less than 10% of the cycle time, thereby reducing common-mode noise and eliminating the need for complex matching circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-speed data transmission is implemented to increase bit rate, then productivity is improved, but electromagnetic interference is generated that affects cellular receivers
Solution Approach 1:
The patent changes the temporal parameters of the differential signal by enforcing steep rise and fall times (less than 10% of cycle time). This parameter modification reduces the duration of electromagnetic transitions, thereby reducing the total electromagnetic interference energy while maintaining high bit rates for productive data transmission
Solution Approach 2:
The patent converts the potentially harmful electromagnetic interference into a beneficial controlled signal characteristic. By designing the differential driver to produce extremely steep rise and fall times, the interference is transformed into a precise timing feature that actually helps reduce common-mode noise and improves signal integrity when properly managed
2Object-generated harmful factors
If rise time and fall time are reduced to less than 10% of cycle time, then common-mode noise is reduced, but device complexity increases due to switching module requirements
Solution Approach 1:
The patent segments the differential driver functionality into at least two separate switching modules, where each module controls one side of the differential pair. This segmentation allows independent optimization of rise and fall times for each signal line, achieving the steep transition requirements while distributing the circuit complexity across modular components
Solution Approach 2:
The patent fundamentally changes the time domain parameters of the output signal by configuring the switching modules to produce rise and fall times that are less than 10% of the signal cycle time. This parameter change directly reduces common-mode noise generation while the modular switching architecture manages the associated complexity
3Reliability
If steep rise and fall times are generated, then signal integrity is improved, but manufacturing precision requirements increase for timing matching
Solution Approach 1:
The patent applies local quality by making each switching module independently capable of producing the required steep rise and fall times. Rather than requiring global timing matching across the entire differential pair, each module locally achieves the timing characteristics, reducing the overall manufacturing precision requirements while maintaining high signal integrity
Data Source
Figure 1a~1b
Figure 1c~1d
Figure 2a
AI summary
The invention relates to an apparatus comprising a differential driver module configured to generate at least one differential signal having steep rise and fall times for at least partially reducing common-mode noise. The invention also relates to a method for causing the differential driver to generate the signal and a system comprising the differential driver and a conductor module for transmission of the generated differential signal. A computer program for performing the method and a computer-readable medium is also part of the invention.