Clock Phase-Alignment Circuitry for Multi-Channel ADC/DAC Synchronization
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Solution Overview
Problem
High-speed ADC and DAC circuitry requires precise synchronization of numerous fast clock signals, which is challenging due to undefined initial states of circuit elements and potential synchronization issues within and between channels, necessitating alignment without high-speed synchronization signals or time-critical reset signals.
Innovation Solution
The implementation of phase-rotation circuitry with phase interpolation and detection mechanisms to align clock signals relative to each other and an external reference, ensuring correct phase relationships and synchronization across multiple channels without requiring high-speed signals or time-critical resets, using phase rotators, dividers, and control circuitry to adjust phase rotations based on detected differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-speed synchronization signals or time-critical reset signals are used to align clock signals, then synchronization precision is improved, but device complexity and noise susceptibility increase
Solution Approach 1:
The patent introduces an intermediary alignment mechanism that uses phase detection and gradual phase rotation adjustment instead of direct high-speed synchronization signals. The phase detector acts as an intermediary that measures phase differences and feeds back to the phase rotator, enabling indirect alignment that avoids the complexity and noise issues of direct high-speed signaling.
Solution Approach 2:
The patent applies preliminary phase alignment adjustments before the main synchronization operation. The phase rotator pre-adjusts the phase of clock signals based on initial phase detection, bringing signals into approximate alignment before final synchronization. This preliminary action reduces the burden on high-speed synchronization mechanisms.
2Measurement precision
If high-speed synchronization signals are used to align clock signals between channels, then synchronization precision is improved, but noise-related issues and reliability decrease
Solution Approach 1:
The phase detector serves as an intermediary that translates high-frequency phase differences into lower-frequency control signals for the phase rotator. This intermediary mechanism filters out high-frequency noise and ensures more reliable phase alignment by operating at lower, less noisy signal frequencies.
Solution Approach 2:
The patent implements a feedback loop where the phase detector continuously monitors phase differences and feeds this information back to the phase rotator. This closed-loop feedback system automatically corrects phase drift and maintains reliable synchronization without requiring high-speed open-loop synchronization signals that are susceptible to noise.
3Stability of the object's composition
If phase rotation adjustment is applied to align derived clock signals, then internal alignment is improved, but device complexity increases
Solution Approach 1:
The phase rotator is designed as a universal component that can adjust the phase of any clock signal derived from a common source. This single multi-functional component replaces what would otherwise require multiple separate alignment circuits for different clock domains, reducing overall device complexity while maintaining internal alignment across all derived signals.
Data Source
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AI summary
Signal-alignment circuitry, comprising: phase-rotation circuitry connected to receive one or more input clock signals and operable to generate therefrom one or more output clock signals; and control circuitry operable to control the amount of phase rotation applied by the phase-rotation circuitry to carry out a plurality of alignment operations, the alignment operations comprising: one or more first operations each comprising rotating one or more of said output clock signals relative to one or more of the other said output clock signals, so as to bring a phase relationship between said output clock signals, or derived clock signals derived therefrom, towards or into a given phase relationship; and one or more second operations each comprising rotating all of said output clock signals together, so as to bring a phase relationship between said output or derived clock signals and said input clock signals or an external-reference signal towards or into a given phase relationship.