Duty Cycle Adjustment Circuit With Coarse-Fine Clock Correction
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Solution Overview
Problem
Existing approaches fail to accurately and efficiently adjust signal duty cycles, especially for high duty cycle variation and limited adjustment ranges, which is crucial for maintaining signal reliability and accuracy as system clock speeds increase.
Innovation Solution
A duty cycle adjustment circuit that includes a clock signal generator, a duty cycle adjustment circuit, and a distribution tree, which adjusts the duty cycle of clock signals using coarse and fine adjustments, enabling real-time correction to achieve desired duty cycles such as 40%, 50%, or 60%, by synchronizing and converting clock signals through input and output buffers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If known duty cycle correction approaches are used, then duty cycle accuracy is improved for specific duty cycles (e.g., 50%), but the system fails to meet response time requirements and cannot handle high duty cycle variation
Solution Approach 1:
The duty cycle adjustment is divided into multiple independent stages: a first adjustment stage that performs coarse correction to bring the duty cycle close to the target value, and a second adjustment stage that performs fine correction to achieve precise target duty cycle. This segmentation allows each stage to be optimized independently, improving overall response time while maintaining accuracy.
Solution Approach 2:
The patent implements dynamic switching between different adjustment modes based on the current duty cycle state. The system automatically transitions from coarse adjustment to fine adjustment as the duty cycle approaches the target value, and can switch between different fine adjustment ranges based on detected oscillation conditions, optimizing response time for varying operating conditions.
2Measurement precision
If known duty cycle correction approaches are used, then duty cycle accuracy is improved, but the adjustment range is limited and cannot handle high duty cycle variation
Solution Approach 1:
The adjustment process is segmented into coarse and fine adjustment stages, where the first stage handles large duty cycle variations through coarse correction, and the second stage handles precise targeting with fine correction. This allows the system to manage both high duty cycle variation and maintain accuracy.
Solution Approach 2:
The first adjustment stage intentionally performs excessive correction by overshooting the target duty cycle to ensure the second stage has sufficient range to perform accurate fine adjustment. This partial action approach expands the overall adjustment range while maintaining precision through the two-stage process.
3Measurement precision
If multi-stage adjustment is implemented, then duty cycle accuracy and response time are improved, but device complexity increases
Solution Approach 1:
The patent uses a single adjustable delay element that serves multiple functions: it performs both coarse adjustment (when operating in first stage mode) and fine adjustment (when operating in second stage mode). This multi-functionality reduces device complexity compared to having separate adjustment circuits for each stage.
Solution Approach 2:
The system dynamically reconfigures the function of adjustment components based on the operating stage. The same delay element and control logic are reused across both coarse and fine adjustment stages, with their parameters dynamically adjusted rather than using fixed dedicated components for each function.
Data Source
AI summary
Apparatuses, duty cycle adjustment circuits, adjustment circuits, and methods for duty cycle adjustment are disclosed herein. An example duty cycle adjustment circuit may be configured to receive a signal and adjust a duty cycle of the signal a first amount using a coarse adjustment. The duty cycle adjustment circuit may further be configured, after adjusting the duty cycle of the signal a first amount, to adjust the duty cycle of the signal a second amount different from the first amount using a fine adjustment to provide a duty cycle adjusted signal.