Differential Transmission Circuit With Dynamic Signal Skew Adjustment
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Solution Overview
Problem
High-speed data transmission circuits face challenges in reducing skew between differential output signals over wide range operation specifications, including variations in process, voltage, and temperature, which affects data transmission efficiency.
Innovation Solution
A differential signal skew adjustment method that synchronizes a reference clock with the output of differential data signals, adjusts the phase of a detection clock based on the first polarity signal, and subsequently adjusts the phase of the second polarity signal to minimize skew between the signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high-speed data transmission is implemented, then data transmission speed is improved, but skew between differential signals increases
Solution Approach 1:
The patent implements dynamic skew adjustment by detecting the actual skew between differential signals and adjusting delay circuits accordingly. The system transitions from static to dynamic compensation, where the skew adjustment amount is determined based on detected signal characteristics rather than fixed design values, enabling effective skew reduction at high transmission speeds.
Solution Approach 2:
The patent employs feedback mechanisms where the skew detection circuit monitors the differential signals and provides information to the skew adjustment circuit. This closed-loop feedback enables real-time compensation for skew variations caused by high-speed transmission, process variations, voltage changes, and temperature fluctuations.
2Manufacturing precision
If skew adjustment circuits are added to reduce signal skew, then signal synchronization is improved, but circuit complexity increases
Solution Approach 1:
The patent extracts the skew detection and adjustment functions into separate dedicated circuits (skew detection circuit and skew adjustment circuit) that operate independently from the main data transmission path. This modular extraction allows for precise skew control without significantly complicating the overall transmission system architecture.
Solution Approach 2:
The patent introduces an intermediary detection circuit that monitors the differential signals and provides control information to the adjustment circuits. This intermediary layer enables indirect control of skew without requiring direct complex interaction between multiple signal paths, simplifying the overall control architecture.
3Device complexity
If conventional skew reduction methods are used, then circuit simplicity is maintained, but skew reduction effectiveness is insufficient
Solution Approach 1:
The patent implements self-service skew compensation where the transmission circuit automatically detects and corrects its own skew issues without external intervention. The skew detection circuit monitors the transmitted differential signals and the adjustment circuits automatically modify delay characteristics based on detected skew, enabling the system to self-correct performance degradation.
Data Source
AI summary
A differential signal skew adjustment method includes: outputting a differential data signal including a first polarity signal and a second polarity signal from a transmission circuit in synchronization with a cycle of a reference clock; adjusting a phase of a detection clock obtained by dividing the reference clock in accordance with a phase of the first polarity signal; and adjusting a phase of the second polarity signal in accordance with an adjusted phase of the detection clock to adjust skew between the first polarity signal and the second polarity signal.