Multiphase Clock Phase Mismatch Detection Across Multiple Cycles
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Solution Overview
Problem
Multiphase clock systems face challenges in detecting phase mismatch due to process variation, temperature, and voltage variations, leading to nonuniform phase spacing and timing errors, which are difficult to calibrate accurately, especially in high-speed systems.
Innovation Solution
A processing device identifies multiple clock phases, determines the aggregate phase distance between selected phases using a charge integrator capacitor and a current source, and compares it to a target time duration to detect phase mismatch, allowing for precise adjustment of the multiphase clock generator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If process variation and systematic imbalances occur in circuit elements, then manufacturing is simplified, but phase spacing uniformity deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the multiphase system measures its own phase spacing and uses this information to adjust and correct phase mismatches. The system continuously monitors phase relationships and applies corrective delays to maintain uniform spacing despite manufacturing variations.
Solution Approach 2:
The system dynamically adjusts timing parameters and phase delays to compensate for manufacturing imbalances. By changing operational parameters rather than relying solely on fixed manufacturing precision, the system achieves uniform phase spacing despite variations in circuit element fabrication.
2Device complexity
If conventional phase detection methods are used, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent measures phase spacing over multiple clock periods rather than within a single period, effectively adding a time dimension to the measurement. This multi-period aggregation approach achieves high measurement precision while using relatively simple circuit elements.
Solution Approach 2:
The system combines multiple phase measurements over several clock periods to achieve high detection accuracy. By aggregating measurements across multiple cycles, the system achieves precision equivalent to measuring 10's of femtoseconds using straightforward circuit implementation.
3Ease of operation
If phase mismatch is not detected and corrected, then operational simplicity is maintained, but timing accuracy deteriorates
Solution Approach 1:
The multiphase system performs self-diagnosis and self-correction by automatically detecting phase mismatches and adjusting its own timing. This self-service capability maintains timing accuracy without requiring external calibration equipment or complex manual adjustment procedures.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method enables accurate detection of phase mismatch to a high degree of accuracy (within 10's of femtoseconds), improving energy efficiency, latency, and overall performance of the multiphase system by reducing phase mismatch and allowing increased frequency.
Implementation Method 1
a charge integrator capacitor to aggregate a phase distance between a first clock phase and a second clock phase of the multiphase system
Implementation Method 2
a current source. The processing device further implements a current gate over the current source that allows the current source to charge the charge integrator capacitor
Data Source
AI summary
A processing device identifies clock phases of a multiphase clock system. The processing device selects a first clock phase and a second clock phase of the clock phases. The processing device determines an aggregate phase distance between the first clock phase and the second clock phase over multiple clock periods. The processing device determines, based on the aggregate phase distance, an aggregate time duration between the first clock phase and the second clock phase over the multiple clock periods of the multiphase clock system.