Clock Network Delay Compensation for Signal Skew Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Integrated circuits face clock skew issues due to manufacturing variations causing differences in signal propagation characteristics across clock networks, leading to misalignment of clock signals at different circuit blocks.
Innovation Solution
The implementation of a circuit system comprising first and second clock networks, a phase detector circuit, and a phase-locked or delay-locked loop circuit, which compares phases to generate a phase detection signal and adjusts clock signals to reduce skew, and an integrated circuit with an adjustable delay circuit in the signal network to compensate for signal skew.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If clock signals are transmitted through different clock networks with different signal propagation characteristics, then the integrated circuit can support larger scale and more complex designs, but clock skew and misalignment occur between different circuit blocks
Solution Approach 1:
The patent adjusts signal propagation parameters (delay, phase) in clock networks to compensate for manufacturing variations. By dynamically changing timing parameters of clock signals across different networks, the system maintains synchronized operation despite physical variations in circuit block implementations.
Solution Approach 2:
The patent implements feedback mechanisms that monitor clock signal arrival times and propagation characteristics across different clock networks. This feedback information is used to dynamically adjust clock signal timing, ensuring that all circuit blocks receive synchronized clock signals even when network characteristics differ.
2Adaptability or versatility
If manufacturing variations cause differences in signal propagation characteristics, then chip-to-chip variability increases, but clock skew between different circuit blocks worsens
Solution Approach 1:
The patent employs dynamic adjustment mechanisms that adapt clock signal timing in real-time based on detected propagation characteristics. Rather than using fixed timing parameters, the system continuously adjusts clock signal phases and delays to compensate for manufacturing variations, maintaining reliable synchronization across diverse chip implementations.
Solution Approach 2:
The system modifies clock signal parameters (phase, delay, frequency) dynamically to compensate for manufacturing variations. By changing these parameters based on detected propagation characteristics, the patent ensures consistent clock synchronization reliability across different chips and circuit blocks despite chip-to-chip variability.
3Adaptability or versatility
If clock networks have different resistance, capacitance, or driver strength, then design flexibility increases, but clock signal arrival time alignment deteriorates
Solution Approach 1:
The patent performs preliminary characterization of clock network propagation characteristics during fabrication or initialization. Based on this preliminary information, the system pre-adjusts clock signal timing parameters to compensate for expected variations in resistance, capacitance, and driver strength, preventing clock skew before it affects circuit operation.
Solution Approach 2:
The system adjusts clock signal parameters (delay, phase, frequency) based on detected network characteristics such as resistance, capacitance, and driver strength. By dynamically changing these parameters, the patent compensates for physical variations in different clock networks, ensuring synchronized clock arrival times despite differences in network design and manufacturing variations.
Data Source
AI summary
An integrated circuit includes a signal network and a phase detector circuit. The signal network includes an adjustable delay circuit. The adjustable delay circuit is coupled at an intersection in the signal network between branches of the signal network. The signal network generates a first signal at a first leaf node of the signal network in response to a second signal. The signal network generates a third signal at a second leaf node of the signal network in response to the second signal. The phase detector circuit compares phases of the first and third signals to generate a phase detection signal. The adjustable delay circuit adjusts a delay provided to the first signal relative to the second signal to reduce a skew between the first and third signals based on the phase detection signal indicating that the first and third signals have the skew.