Phase Mixer Circuit Adjustment for Faster Clock Locking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High-speed electronic systems face challenges in synchronizing clock signals across components due to manufacturing variations and environmental factors, leading to significant phase differences, which prolong the time required to achieve a locked condition in clock generator circuits.
Innovation Solution
The implementation of a clock generator circuit with an adjustable delay line and a fine phase adjust circuit, utilizing a phase detector and averaging filter to smoothly adjust delays, and a phase mixer circuit to incrementally adjust the timing of clock signals, allowing for faster locking by adjusting the fine delay in larger steps during initialization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional DDLL circuit is used for clock synchronization, then the clock signals can be synchronized across components, but the initialization time is prolonged due to sequential fine delay adjustment
Solution Approach 1:
The delay adjustment is segmented into coarse delay and fine delay components. The coarse delay provides initial alignment while the fine delay performs precise adjustment, allowing parallel operation rather than sequential adjustment and reducing total initialization time.
Solution Approach 2:
The coarse delay is adjusted first to establish a preliminary locked condition before fine delay adjustment begins. This preliminary action reduces the range over which fine delay must search, significantly reducing the time to achieve final lock.
2Measurement precision
If the fine delay is adjusted incrementally to achieve precise timing, then the clock synchronization precision is improved, but the time to achieve locked condition increases
Solution Approach 1:
The timing adjustment process is divided into two segments: coarse delay adjustment for initial alignment and fine delay adjustment for precise timing. This segmentation allows the system to first achieve approximate synchronization quickly, then refine the timing precision without searching the entire range incrementally from scratch.
Solution Approach 2:
The coarse delay performs a preliminary adjustment that brings the clock signals into approximate alignment before fine delay adjustment begins. This preliminary action establishes a starting point close to the final solution, reducing the number of incremental steps needed to achieve precise timing.
3Reliability
If manufacturing parameters and environmental factors are controlled to minimize phase differences, then the synchronization performance is improved, but the device complexity and cost increase
Solution Approach 1:
The DDLL circuit automatically detects phase differences between clock signals and self-corrects by adjusting delays through the coarse and fine delay mechanisms. This self-service capability eliminates the need for external calibration equipment or complex control systems, achieving high synchronization performance through autonomous operation.
Solution Approach 2:
The phase detector continuously monitors the phase relationship between reference and generated clock signals, providing feedback to the delay adjustment mechanisms. This feedback loop enables automatic compensation for manufacturing variations and environmental factors without requiring complex external control systems.
Data Source
AI summary
Apparatuses and methods for adjusting a phase mixer circuit are disclosed. An example apparatus includes a shift register that includes a plurality of registers coupled in series to one another. The plurality of registers are grouped into a first group of registers and a second group of registers. The first group of registers includes first and second registers. The second group of registers includes a third register. The first and second registers of the first group of registers are configured to receive in common an output of the third register of the second group of registers so that both the first and second registers store the output of the third register responsive to a shift clock.