Internal Clock Phase Control for PVT Variation Compensation
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Solution Overview
Problem
Semiconductor systems face operation errors due to internal PVT variations causing phase misalignment between internal and external clocks, leading to inefficiencies in data transfer rates.
Innovation Solution
A phase control system that differentially controls delay variations for internal and reference clocks using target and reference codes, generated by a delay amount control circuit, to synchronize the internal clock with the reference clock, thereby compensating for PVT variations and maintaining data transfer accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If clock frequency is divided to achieve high transfer rate, then data transfer speed is improved, but phase alignment between internal and external clocks deteriorates due to PVT variation
Solution Approach 1:
The patent implements a feedback mechanism where the phase difference detection circuit continuously monitors the phase alignment between the divided internal clock and the external reference clock. When phase misalignment is detected due to PVT variations, the system adjusts the delay amount of the internal clock generation circuit to restore proper synchronization, enabling reliable high-speed data transfer despite environmental changes
Solution Approach 2:
The patent dynamically changes the delay parameter of the internal clock generation circuit in response to detected phase differences. By adjusting the delay amount based on real-time phase alignment status, the system maintains accurate synchronization between internal and external clocks while operating at high transfer rates
2Reliability
If delay variation is increased to compensate for PVT variation, then phase alignment is improved, but system complexity increases
Solution Approach 1:
The patent divides the clock generation and control functions into separate modular circuits: an internal clock generation circuit that produces the divided clock, a phase difference detection circuit that monitors alignment, and a delay amount control circuit that adjusts timing. This segmentation allows each module to perform its function independently, simplifying the overall control architecture while maintaining reliable phase synchronization
Solution Approach 2:
The system implements self-adjustment through automatic phase difference detection and delay correction. The phase difference detection circuit autonomously identifies misalignment, and the delay amount control circuit automatically adjusts the internal clock timing without external intervention, reducing the need for complex manual control mechanisms
Data Source
AI summary
A system for performing a phase control operation includes: an internal clock generation circuit configured to generate an internal clock by delaying a clock by a first delay variation, and generate a reference clock by delaying the clock by a second delay variation, wherein the internal clock generation circuit generates the internal clock by delaying the clock by the first delay variation which is controlled according to a phase difference between the internal clock and the reference clock; and a data input/output circuit configured to input/output data in synchronization with the internal clock.