Dynamic Phase Alignment Circuit With Fine Clock Phase Selection
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Solution Overview
Problem
Existing dynamic phase alignment circuits face limitations in accurately aligning phases of clock signals with data signals due to limited phase resolution, which can lead to suboptimal sampling and increased errors in data processing.
Innovation Solution
The proposed dynamic phase alignment circuit employs a phase generator that produces 16 periodic clock signals with varying phases, allowing for more precise selection of the clock signal closest to the data sampling window, and uses adjustable delay circuits to fine-tune the phase alignment, enhancing phase detection and alignment accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a limited number of phase-offset clock signals are used, then the device complexity is reduced, but the phase alignment accuracy deteriorates
Solution Approach 1:
The patent implements dynamic phase alignment by continuously monitoring phase errors and adjusting the selected clock signal phase in real-time, transforming a static phase selection system into a dynamic adaptive system that maintains optimal alignment without requiring exhaustive phase options
Solution Approach 2:
The patent employs feedback mechanisms where phase detector circuits continuously compare the phase of selected clock signals with reference signals, and the control logic circuit adjusts the phase selection based on detected phase errors, creating a closed-loop system that improves accuracy without proportionally increasing complexity
2Measurement precision
If more phase-offset clock signals are generated, then the phase alignment accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent segments the phase adjustment function into discrete selectable phases with fixed offsets, allowing the system to achieve fine phase alignment through combinatorial selection rather than continuous adjustment, thereby improving accuracy while controlling complexity through modular design
Solution Approach 2:
The patent changes the phase parameter of clock signals by selecting from multiple pre-defined phase offsets and dynamically adjusting which phase is selected based on detected errors, achieving high phase alignment accuracy through parameter selection rather than generating numerous clock signal paths
3Measurement precision
If dynamic phase adjustment is implemented, then the phase alignment accuracy is improved, but the ease of operation deteriorates
Solution Approach 1:
The patent implements self-service operation where the control logic circuit automatically monitors phase alignment and adjusts the selected clock signal phase without external intervention, making the complex dynamic adjustment process transparent to the user and maintaining ease of operation while achieving high accuracy
Data Source
AI summary
A dynamic phase alignment circuit includes a phase generator circuit having delay-locked loop circuits that generate periodic output signals. Each of the delay-locked loop circuits generates one of the periodic output signals in response to at least two periodic input signals. A multiplexer circuit selects a selected periodic signal from among the periodic input signals and the periodic output signals based on select signals. A phase detection circuit compares a phase of the selected periodic signal to a data signal to generate a phase detection signal. A control logic circuit generates the select signals. The control logic circuit adjusts the select signals based on changes in the phase detection signal to cause the multiplexer circuit to adjust the phase of the selected periodic signal.