Clock-Data Delay Matching for Low-Latency Signal Synchronization
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Solution Overview
Problem
Devices face challenges in aligning high and low portions of a data input signal with rising and falling edges of a clock input signal, resulting in significant synchronization delays that affect the accuracy of data processing.
Innovation Solution
A receiving circuit is designed to align the high and low portions of a data input signal with the rising and falling edges of a clock input signal without significant synchronization delay by using a delay circuit that matches the propagation delays of both signals, incorporating elements like delay lines and calibration circuits to ensure prompt alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional receiving circuits are used to receive data input signal and clock input signal, then the device can process data, but significant synchronization delay occurs between data portions and clock edges
Solution Approach 1:
The patent applies preliminary action by introducing a delay circuit that pre-adjusts the clock input signal timing before it reaches the data sampling point. The delay circuit is configured to delay the clock signal by a predetermined amount that matches the propagation delay through the data path, ensuring that clock edges arrive at the optimal moment to sample data portions without synchronization delay. This proactive timing adjustment eliminates the need for reactive correction and achieves precise alignment between data and clock signals.
Solution Approach 2:
The patent employs parameter changes by dynamically adjusting the delay amount of the clock signal based on measured propagation delays. The system monitors the actual timing characteristics of the data path and modifies the clock delay parameter accordingly. This allows the synchronization system to adapt to variations in propagation delay caused by temperature, voltage, or process variations, maintaining optimal alignment accuracy under different operating conditions.
2Measurement precision
If delay circuits are added to synchronize data and clock signals, then synchronization accuracy improves, but device complexity increases
Solution Approach 1:
The patent introduces an intermediary delay circuit that acts as a mediator between the clock signal source and the data sampling point. This delay circuit is designed as a modular component with standardized interfaces, allowing it to be integrated into the existing receiving circuit without requiring complete redesign. The delay circuit receives the clock signal, applies the appropriate delay, and outputs the adjusted clock signal to the sampling point, thereby achieving synchronization while maintaining a clear separation of functions and minimizing overall circuit complexity.
3Measurement precision
If propagation delay matching is implemented, then data processing accuracy improves, but power consumption increases
Solution Approach 1:
The patent implements self-service by designing the delay circuit to automatically measure and adjust its own delay parameter based on the actual propagation delay through the data path. The system includes a calibration mode where test signals are passed through the data path, the propagation delay is measured, and the delay circuit automatically configures its delay amount to match. This eliminates the need for external calibration equipment or continuous manual adjustment, reducing the operational power consumption while maintaining accurate synchronization.
Data Source
AI summary
A device includes a receiving circuit, a processing circuit, and a transmitting circuit. The receiving circuit generates a clock input signal and includes a plurality of receivers, each of which receives a data input signal and generates a first data output signal. Each receiver includes a delay line that is devoid of a duty cycle corrector (DCC), that has a predetermined number of delay elements, and that introduces a propagation delay to the data input signal by a fixed amount that substantially matches a propagation delay of the clock input signal. The processing circuit processes the first data output signal and generates a second data output signal. The transmitting circuit transmits the second data output signal to a data signal-receiving device.