Clock generation for multi-phase converters
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Solution Overview
Problem
Existing multiphase clock systems in switching voltage regulator circuits face challenges in maintaining accurate and consistent phase differences among multiple clocks, affecting circuit performance.
Innovation Solution
A multiphase switching voltage regulator circuit that includes a first clock generator circuit generating M first clocks phase-separated by 360°/M, N phase extrapolator circuits, and a phase selector multiplexer to generate N output clocks phase-separated by 360°/N, with each phase extrapolator circuit controlling phase differences using a ramp generator and comparator to achieve precise phase offsets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple multiphase clocks are used in switching voltage regulator circuits, then power regulation capability is improved, but maintaining accurate and constant phase difference among clocks becomes difficult
Solution Approach 1:
The system divides the clock generation function into multiple independent phase extrapolator circuits, each responsible for generating a specific phase of the multiphase clock. Each extrapolator receives a base clock and independently generates its phase-shifted output, ensuring precise phase control while enabling parallel power regulation across multiple phases.
Solution Approach 2:
The system employs feedback mechanisms where each phase extrapolator monitors its output phase and adjusts its internal timing to maintain the desired phase difference. This feedback ensures that even under varying load conditions or temperature changes, the phase relationships remain accurate and stable, directly addressing the measurement precision challenge.
2Productivity
If multiple multiphase clocks are used in switching voltage regulator circuits, then power regulation capability is improved, but phase difference constancy deteriorates
Solution Approach 1:
The phase extrapolator circuits are designed as universal modules that can generate any desired phase shift from a common base clock. Each extrapolator can be configured to produce the specific phase angle required for its particular power phase, allowing the system to maintain consistent phase relationships across all phases while supporting flexible power regulation configurations.
Solution Approach 2:
Continuous monitoring and adjustment mechanisms ensure that phase differences remain constant despite variations in operating conditions. Each phase extrapolator incorporates feedback loops that detect phase deviations and automatically correct them, maintaining stable phase relationships essential for reliable multi-phase power regulation.
3Measurement precision
If phase extrapolator circuits are added to generate precise multiphase clocks, then phase difference accuracy is improved, but device complexity increases
Solution Approach 1:
The system uses identical phase extrapolator circuit designs for each phase, where each extrapolator is a replicated copy of the same proven module. This standardization simplifies the overall design process, as engineers only need to master one extrapolator design that can be copied and deployed across all phases, reducing the effective complexity despite the increased number of components.
Solution Approach 2:
By segmenting the clock generation function into separate, modular phase extrapolator circuits, the system makes complexity manageable. Each extrapolator is a self-contained module with a single function (generating one phase), which simplifies analysis, debugging, and maintenance compared to a monolithic clock generation system.
Data Source
AI summary
A multiphase switching voltage regulator is disclosed. The regulator includes a first clock generator circuit configured to receive a reference clock, and to generate M first clocks, where the M first clocks are phase separated by 360°/M, a plurality of phase extrapolator circuits, where the plurality of phase extrapolator circuits includes N phase extrapolator circuits, and a phase selector multiplexer configured to provide one of the M first clocks to each of the phase extrapolator circuits, where the N phase extrapolator circuits are configured to generate N output clocks, where the N output clocks are phase separated by 360°/N.