Mixed-Mode S-Parameter Evaluation for 3-Line Transmission Noise
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Solution Overview
Problem
The existing methods for evaluating transmission characteristics in 3-line transmission schemes, such as MIPI C-PHY standards, face difficulties due to the complexity of signal transmission patterns and the inability to effectively assess components and substrates using conventional mixed-mode S-parameters.
Innovation Solution
A transmission characteristics measuring method and apparatus that measure and calculate mixed-mode S-parameters based on transition patterns of signal levels across three transmission lines, including defining modes for equivalent and identical signal level variations, allowing for the evaluation of transmission characteristics and common mode noise without changing the connection configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional mixed-mode S-parameters are used to evaluate transmission characteristics, then the evaluation method is simple and straightforward, but it cannot effectively assess components and substrates in 3-line transmission schemes due to signal transmission complexity
Solution Approach 1:
The patent transforms the evaluation parameters from conventional single-ended S-parameters to mixed-mode S-parameters specifically designed for 3-line transmission schemes. This parameter change enables the evaluation method to adapt to the complex signal transmission patterns in MIPI C-PHY standards while maintaining a systematic and manageable measurement approach.
Solution Approach 2:
The patent segments the complex 3-line transmission signal into distinct modes (common mode, differential mode, and half-differential mode) for separate evaluation. By dividing the evaluation into these specific modes, the patent makes it possible to assess each transmission characteristic independently, thereby resolving the complexity issue while improving adaptability.
2Ease of operation
If the signal transmission pattern is simplified for easier evaluation, then the measurement process becomes easier, but it cannot capture the actual complex signal patterns used in MIPI C-PHY standards
Solution Approach 1:
The patent employs dynamic measurement methods that adapt to different signal transmission patterns in real-time. By using switching networks and controllable signal sources, the system can dynamically adjust measurement configurations to match actual operating conditions, thereby maintaining both ease of operation and measurement precision for complex MIPI C-PHY signals.
Solution Approach 2:
The patent introduces mixed-mode S-parameters as intermediary measurement quantities that bridge the gap between simple measurement processes and complex signal patterns. These intermediate parameters serve as mediators that capture the essence of complex transmissions while remaining measurable through standardized techniques, thus preserving both ease of operation and measurement accuracy.
3Reliability
If noise countermeasures are strengthened in the transmission scheme, then signal integrity improves, but it becomes more difficult to objectively evaluate the characteristics of components and substrates
Solution Approach 1:
The patent performs preliminary measurements of S-parameters under controlled conditions before actual signal transmission. By pre-characterizing the transmission lines, components, and substrates using mixed-mode S-parameters, the system establishes baseline data that facilitates subsequent noise analysis and signal integrity evaluation, thereby making component and substrate assessment more manageable despite strengthened noise countermeasures.
Solution Approach 2:
The patent implements feedback mechanisms where measured S-parameters are used to adjust and optimize noise countermeasures. By continuously monitoring transmission characteristics and feeding this information back into the design and evaluation process, the system maintains objective evaluation capabilities while improving signal integrity through iterative optimization of noise mitigation strategies.
Data Source
AI summary
An S-parameter of an object to be measured is measured, which includes (i) three transmission lines configured such that a ternary signal is transmitted through a corresponding one of the three transmission lines and (ii) six ports as total ports included in the three transmission lines each having a pair of ports. Based on the measured S-parameter, a parameter is calculated, which shows transparent characteristics in each mode among mixed-mode S-parameters in accordance with transition patterns of signal levels on the three transmission lines.