CTLE Parameter Adjustment via FFE and DFE Frequency Response Correlation
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Solution Overview
Problem
Continuous time linear equalizers (CTLE) in receivers face inefficiencies and inaccuracies when used with decision feedback equalizers (DFE) due to non-correlation caused by intervening feed-forward equalizers (FFE), leading to poor control over frequency boosting ranges.
Innovation Solution
Adjusting the operation of the receiver by determining its operating region using frequency responses of the FFE and DFE at specific frequencies, and adjusting the CTLE parameters based on these responses to force the CTLE frequency boosting within a desired range, thereby improving correlation and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a feed-forward equalizer is located between the CTLE and DFE, then the signal can be further equalized, but the correlation between the DFE tap and the CTLE output is interfered with, leading to inefficient and inaccurate CTLE adaption
Solution Approach 1:
The patent introduces a correlation calculation unit that acts as an intermediary to measure the correlation between the DFE tap and CTLE output, and a control unit that uses this correlation information to adjust the CTLE parameters. This intermediary mechanism resolves the interference caused by the FFE by providing direct feedback about the CTLE-DFE correlation, enabling accurate CTLE adaption despite the presence of the FFE in between.
2Productivity
If the CTLE frequency boosting is adjusted based on DFE tap, then the equalization can be performed, but the non-correlation between DFE and CTLE resulting from intervening circuitry leads to inefficient adaption
Solution Approach 1:
The patent implements a feedback mechanism where the correlation between the DFE tap and CTLE output is continuously calculated and used to adjust the CTLE parameters. The control unit receives correlation information and adjusts the CTLE frequency boosting accordingly, creating a closed-loop system that ensures both speed and accuracy in equalization by continuously optimizing the CTLE settings based on actual correlation measurements.
Data Source
AI summary
Devices and methods for adjusting operation of a receiver that includes a continuous time linear equalizer, a decision feedback equalizer, and a feed forward equalizer. Operation of the receiver may be controlled by determining whether the receiver is operating in operation region using frequency responses of the feed forward equalizer at a first frequency and a second frequency and using the frequency responses of the decision feedback equalizer at the first frequency and the second frequency. If the operation is outside the frequency, a parameter of the continuous time linear equalizer is adjusted based on the frequency responses of the feed forward equalizer and the decision feedback equalizer.