Adaptive Clock Phase Alignment for High-Speed Data Reception
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Solution Overview
Problem
Conventional signal transmission systems face challenges in high-speed digital transmission due to piece-to-piece variations and temperature/voltage fluctuations, leading to time lags between clock and data signals, especially in ultrahigh-speed and multi-bit data scenarios.
Innovation Solution
A clock adjustment apparatus comprising a phase adjustment device, a phase detection device, and a control device that synchronizes the clock signal with the data signal within the reception apparatus without transmitting the clock signal from the transmission apparatus, using phase detection and control signals to adjust the delay amount and synchronize the clock with the data signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If synchronous system is used to transmit clock and data signals, then clock distribution is simplified, but time lag between clock and data signals increases due to piece-to-piece variations and temperature/voltage fluctuations
Solution Approach 1:
The patent extracts the clock signal transmission function from the transmission apparatus and relocates clock generation to the reception apparatus. The reception apparatus generates its own clock signal based on detected phase information from data signals, eliminating the need to transmit clock signals and their associated synchronization problems.
Solution Approach 2:
The patent implements a feedback mechanism where the reception apparatus detects phase information from incoming data signals and uses this information to adjust its locally generated clock signal. This closed-loop feedback ensures the clock signal remains synchronized with the data signals despite environmental variations.
2Reliability
If source synchronous system is used to improve tolerance to variations, then reliability improves, but time lag between clock and data signals becomes problematic in ultrahigh speed transmission
Solution Approach 1:
The patent makes the clock signal dynamic by allowing its phase to be adjusted based on detected phase information from data signals. The reception apparatus continuously adapts the clock signal's phase to match the data signal timing, enabling the system to handle ultrahigh speed transmissions where fixed time lags become problematic.
3Ease of operation
If clock signal is transmitted from transmission apparatus to reception apparatus, then synchronization is simplified, but circuit scale increases and adaptability decreases
Solution Approach 1:
The reception apparatus serves itself by generating its own clock signal based on phase detection from incoming data signals. This self-service approach eliminates the need for external clock signal transmission and reduces the overall circuit scale while maintaining synchronization capability.
4Manufacturing precision
If wiring length variations are considered in multi-bit data design, then manufacturing precision improves, but device complexity and design difficulty increase
Solution Approach 1:
The patent changes the approach from physically equalizing wiring lengths to dynamically adjusting the clock signal phase based on detected timing information. This parameter change allows the system to achieve equal time lags between multiple data bits without the complex design constraints of matching physical wiring lengths.
Data Source
AI summary
A clock adjustment apparatus delays a clock signal and adjusts a phase of the signal, thereby increasing or decreasing a delay amount of the clock signal in accordance with a phase relation between a data signal and an adjusted clock signal. The adjusted clock signal is used for receiving the data signal.