Electronic Device Link Equalization Using Figure of Merit
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Solution Overview
Problem
As data processing speeds increase in electronic devices, signals transmitted through channels become more vulnerable to noise, making signal restoration more difficult, and existing methods for link equalization are inefficient in optimizing transmission settings.
Innovation Solution
An electronic device with an equalizing controller that measures figure of merit (FoM) values for different presets to identify the optimal preset type for transmission equalization, adjusting the transmission equalizer settings to improve signal quality by determining the preset type with the highest FoM value and transmitting an equalizing setup request to control the external device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If data transmission speed is increased, then data processing capability is improved, but signal vulnerability to noise increases
Solution Approach 1:
The transmitting device performs transmission equalizing operation in advance before data transmission, adjusting equalizer parameters to compensate for anticipated channel effects. This preliminary adjustment of equalization parameters prepares the signal to be more resilient to noise, allowing high-speed transmission while maintaining signal integrity through pre-optimized equalization settings
Solution Approach 2:
The system dynamically changes equalization parameters (such as pre-emphasis and de-emphasis values) based on measured channel conditions and signal quality metrics. By adjusting these parameters in response to transmission speed and noise conditions, the system maintains optimal signal quality across varying data rates, resolving the contradiction between speed and reliability
2Reliability
If transmission equalizing operation is performed to reduce noise vulnerability, then signal restoration becomes easier, but transmission complexity increases
Solution Approach 1:
The transmission equalizing operation is divided into separate functional blocks: a pre-emphasis stage at the transmitter that adjusts signal levels before transmission, and a corresponding de-emphasis stage at the receiver that restores the original signal. This segmentation allows each stage to be optimized independently, reducing overall complexity while maintaining effective signal restoration
Solution Approach 2:
The receiving device measures signal quality parameters and automatically determines optimal equalization settings, then communicates these settings back to the transmitting device. This self-adjusting mechanism eliminates the need for complex manual configuration or centralized control, reducing transmission complexity while ensuring effective signal restoration through adaptive equalization
3Reliability
If link equalization negotiation is performed to optimize transmission settings, then communication performance is improved, but equalization time increases
Solution Approach 1:
The system performs link equalization negotiation and parameter optimization during the initial connection establishment phase, before actual data transmission begins. By completing the time-consuming measurement and negotiation processes in advance, the system ensures optimal communication performance is configured beforehand, eliminating delays during active data transfer while still achieving thorough equalization optimization
Solution Approach 2:
The system implements periodic link equalization updates at predetermined intervals or when channel conditions change significantly. Instead of continuous negotiation, the system performs measurements and adjustments periodically, maintaining optimal communication performance while minimizing the time spent on equalization operations by concentrating them in discrete periodic events rather than continuous processes
Data Source
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AI summary
An operation method includes measuring figure of merit (FoM) values for a first group of presets having different preset types, based on equalized signals output from a transmission equalizer included in an external device adjusted based on the first group, identifying a preset type of a first preset corresponding to first FoM value which is a greatest value from among the FoM values for the first group, measuring FoM values for a second group of presets having the identified preset type, based on equalized signals output from the transmission equalizer adjusted based on the second group, determining a second preset corresponding to second FoM value which is a greatest value from among the first FoM value and the FoM values for the second group, and transmitting an equalizing setup request that controls the transmission equalizer to the external device, based on the determined second preset.