Serial Data Signal Edge Distortion Compensation via Pulse Generation
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Solution Overview
Problem
High-speed serial communication systems face distortions due to frequency-dependent magnitude loss and increasing group delay in communication channels, limiting data rates and introducing errors such as overshoot and ringing.
Innovation Solution
A device with multiple delay paths and pulse generators is used to compensate for these distortions by generating and combining compensation pulses with the main path delayed serial data signal, allowing for flexible adjustment of pulse widths, amplitudes, and polarities to counteract magnitude loss and nonlinear phase effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high data rates are transmitted through the communication channel, then productivity is improved, but edge distortions increase due to frequency-dependent magnitude loss and group delay
Solution Approach 1:
The patent applies preliminary action by generating compensation pulses before the distorted signal arrives at the receiver. These pre-generated pulses are designed to counteract the expected distortion effects, effectively pre-compensating for the channel's frequency-dependent magnitude loss and group delay. This allows high data rates to be transmitted while maintaining signal integrity through advance correction of anticipated distortions.
Solution Approach 2:
The patent converts the harmful effect of channel distortion into a benefit by characterizing the distortion properties and using them to generate compensating pulses. The same frequency-dependent magnitude loss and group delay that cause edge distortion are utilized to predict and counteract the distortion, transforming the channel's harmful characteristics into useful information for signal correction.
2Device complexity
If compensation pulses are generated with fixed parameters, then device complexity is reduced, but adaptability to different communication channel characteristics deteriorates
Solution Approach 1:
The patent implements dynamics by making the compensation pulse parameters variable rather than fixed. The pulse width, amplitude, and polarity are dynamically adjusted based on the specific characteristics of the communication channel. This allows the compensation mechanism to adapt to different channel conditions while maintaining a relatively simple overall device structure, resolving the contradiction between complexity and adaptability.
Solution Approach 2:
The patent applies parameter changes by modifying key parameters of the compensation pulses (width, amplitude, polarity) to match the specific distortion characteristics of the communication channel. By changing these parameters based on channel measurements or specifications, the system achieves adaptability to different channel conditions without requiring a completely different compensation mechanism for each scenario.
3Adaptability or versatility
If multiple delay paths are used to generate compensation pulses, then adaptability to different distortion scenarios is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the compensation mechanism into multiple delay paths, each handling different aspects of the distortion compensation. This segmentation allows independent optimization of each path for specific distortion scenarios while maintaining overall system manageability. The modular structure provides adaptability to different distortion types without creating an unmanageably complex monolithic system.
Solution Approach 2:
The patent combines multiple delay paths into a unified compensation output that works together to address various distortion scenarios. By merging the outputs of different delay paths with appropriately timed and shaped pulses, the system achieves comprehensive distortion compensation. This combining approach provides the benefits of multiple specialized paths while maintaining system simplicity through integrated output processing.
Data Source
AI summary
A device compensates for distortions of a serial data signal introduced by a communication channel in a serial communication system. The device includes main path, first and second delay paths, first and second pulse generators, and combiner. The first and second delay paths delay a tapped-off portion of the serial data signal by first and second delay amounts, respectively, where the first delay amount is less than a main path delay amount and the second delay amount greater the main path delay amount. The first and second pulse generators generate first and second compensation pulses in response to the serial data signal delayed by the first and second delay amounts, respectively. The combiner combines the first and second compensation pulses with the main path delayed serial data signal, where the first and second compensation pulses compensate for magnitude loss and nonlinear phase of the main path delayed serial data signal.