Transmitter Merging FFE and Crosstalk Cancellation
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Solution Overview
Problem
Existing chip-to-chip communication systems face complexity and inefficiency in crosstalk cancellation due to the need for additional circuits and configurations, such as capacitors or short delay lines, which increase system complexity and reduce effectiveness.
Innovation Solution
A transmitter with a fractional-UI FFE that integrates crosstalk cancellation by adjusting the amplitude and pulse width of the feed-forward equalizer based on predicted crosstalk from nearby channels, reducing system complexity and eliminating crosstalk through coefficient adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a capacitor or short delay line is employed to create waveform like crosstalk and a feed-forward equalizer (FFE) is added, then crosstalk cancellation is achieved, but the degree of complexity of the configuration increases
Solution Approach 1:
The patent merges the FFE and XTC circuits into a single integrated structure where the FFE driver block serves dual purposes: performing feed-forward equalization and generating crosstalk cancellation waveforms. This eliminates the need for separate capacitor or delay line circuits, reducing system complexity while maintaining crosstalk cancellation effectiveness
Solution Approach 2:
The FFE driver block is designed to perform multiple functions simultaneously: it generates the main data waveform, creates waveform-like crosstalk signals, and applies amplitude adjustments for both equalization and crosstalk cancellation. This multi-functionality reduces the number of dedicated components needed in the system
2Reliability
If additional circuits are added for crosstalk cancellation, then crosstalk elimination is improved, but system complexity and additional circuit requirements increase
Solution Approach 1:
The patent combines crosstalk cancellation functionality within the existing FFE driver block, eliminating the need for separate crosstalk cancellation circuits. The same driver that generates the main signal also generates and adjusts the crosstalk cancellation waveform, reducing additional circuit requirements
Solution Approach 2:
The FFE driver block serves itself by generating both the main data waveform and the crosstalk cancellation waveform internally. The encoder provides coefficients that the driver block uses to self-adjust its output for both equalization and crosstalk cancellation purposes
Data Source
AI summary
Provided is a transmitter performing at least feed-forward equalizing and crosstalk cancellation, the transmitter including: a main driver (20) generating waveform including data to be transmitted; and an FFE driver block (40) connected to the main driver in parallel, and generating waveform that is acquired by applying a sum of amplitude for feed-forward equalizing and amplitude for crosstalk cancellation, so as to adjust the waveform generated by the main driver.