Adaptive Clock Duty-Cycle Control Using Phase Extension
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Solution Overview
Problem
Asymmetric aging in clock distribution networks causes duty-cycle distortion in clock signals, leading to timing issues in circuits due to uneven delays in signal paths, which existing technologies fail to adequately address.
Innovation Solution
A duty-cycle adjuster system that includes multiplexers, inverters, and phase extenders, along with delay devices, to adjust and extend clock phases, ensuring accurate duty-cycle compensation by generating multiple delayed versions of the clock signal and combining phases to correct duty-cycle distortions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple clock distribution network is used, then device complexity is reduced, but duty-cycle distortion occurs due to asymmetric aging in signal paths
Solution Approach 1:
The clock distribution network is segmented into multiple independent signal paths (first signal path and second signal path) that can be individually adjusted. This segmentation allows each path to be optimized separately using phase extenders, enabling precise duty-cycle control without requiring complete redesign of the entire clock distribution network.
Solution Approach 2:
The phase extender circuit is designed as a universal component that can be applied to multiple clock signal paths. The same phase extender structure with configurable delay elements can adjust phase in both the first and second signal paths, providing a scalable solution that maintains reliability across complex networks without increasing overall system complexity.
2Manufacturing precision
If phase adjustment circuits are added to correct duty-cycle distortion, then duty-cycle accuracy is improved, but device complexity increases
Solution Approach 1:
Instead of uniformly complexizing the entire clock distribution network, phase extenders are selectively applied only at specific locations where duty-cycle distortion occurs. Each phase extender is locally configured with specific delay element values tailored to the particular signal path requirements, providing precise duty-cycle correction only where needed rather than throughout the entire network.
Solution Approach 2:
The phase extenders incorporate dynamically adjustable delay elements that can be configured to provide different phase shifts based on the specific requirements of each signal path. This dynamic adjustability allows the system to maintain simple hardware architecture while achieving precise duty-cycle control through programmable or tunable delay configurations.
Data Source
AI summary
Aspects of the present disclosure related to a method of phase extension using a delay circuit including delay devices coupled in series. The method includes receiving a clock signal, generating multiple delayed versions of the clock signal, wherein each of the delayed versions of the clock signal is delayed by a different number of the delay devices, and combining high phases or low phases of the delayed versions of the clock signal to obtain a combined clock signal.