Duty Cycle Correction Circuit With Dual-Resolution Code Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing duty cycle correction circuits in semiconductor circuits face challenges in achieving precise duty cycle correction without increasing circuit area and power consumption, often introducing 1-bit code errors due to resolution limitations.
Innovation Solution
A duty cycle correction circuit comprising a phase adjustment circuit, divider circuit, and duty control circuit, which adjusts duty cycles using multiple control codes, detects phase differences, and adjusts control codes in smaller units to achieve precise duty correction, minimizing circuit area and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing duty cycle correction circuits are used, then circuit area and power consumption are maintained, but 1-bit code errors are introduced due to resolution limitations
Solution Approach 1:
The patent implements a dual-resolution control mechanism where the duty control circuit dynamically switches between a first resolution (coarser) for initial duty cycle adjustment and a second resolution (finer) for precision correction. This dynamic resolution switching enables the system to achieve high precision duty cycle correction without proportionally increasing circuit complexity, thereby reducing 1-bit code errors while maintaining reasonable circuit area and power consumption.
Solution Approach 2:
The correction code is segmented into multiple parts with different weights, where some bits control coarse duty cycle adjustment and others control fine adjustment. This segmentation allows the system to achieve high precision through coordinated action of multiple control bits rather than requiring a single high-resolution control signal, thus improving measurement precision without proportionally increasing the harmful effects of code errors.
2Measurement precision
If higher resolution control codes are used to reduce 1-bit code errors, then duty cycle correction precision is improved, but circuit area and power consumption increase
Solution Approach 1:
The system dynamically adjusts the resolution of control codes based on the correction stage. During initial correction, a coarser resolution is used requiring fewer control bits and smaller circuit area. During precision correction, the system switches to finer resolution only when necessary, minimizing the overall circuit area while achieving high precision duty cycle correction.
Solution Approach 2:
Different parts of the control code are assigned different resolutions based on their functional requirements. The most significant bits control coarse adjustment with lower resolution requirements, while least significant bits control fine adjustment with higher resolution requirements. This local differentiation of quality allows precise duty cycle correction without requiring uniformly high resolution across all control bits, thus reducing overall circuit area.
3Measurement precision
If higher resolution control codes are used to minimize 1-bit code errors, then duty cycle correction precision is improved, but power consumption increases
Solution Approach 1:
The duty control circuit dynamically selects the appropriate resolution level based on the current correction needs. When large duty cycle adjustments are required, the system uses coarser resolution which activates fewer control logic paths and consumes less power. When precision correction is needed, the system temporarily uses finer resolution with higher power consumption only for the necessary duration, thereby achieving high precision while minimizing overall power consumption.
Solution Approach 2:
The control code is divided into segments where only the necessary bits are actively controlled at high resolution. The most significant bits are controlled with sufficient precision for coarse adjustment, while only the least significant bits require fine resolution control. This local differentiation reduces the number of high-resolution control operations, thereby reducing power consumption while maintaining duty cycle correction precision.
4Device complexity
If simple duty cycle correction is used, then circuit complexity is reduced, but phase difference detection accuracy decreases
Solution Approach 1:
The phase difference detection function is segmented and integrated into the existing duty control structure rather than implemented as a separate complex circuit. The phase difference detection is performed by analyzing the relationship between control bits and duty cycle output, utilizing the existing control logic infrastructure. This segmentation approach maintains detection accuracy while avoiding the need for additional complex dedicated detection circuits.
Solution Approach 2:
The duty control circuit is designed to perform multiple functions: duty cycle adjustment, phase difference detection, and resolution switching. By making the duty control circuit multi-functional, the system achieves accurate phase difference detection without adding separate dedicated detection circuits, thereby maintaining low circuit complexity while preserving measurement precision.
Data Source
AI summary
A duty cycle correction circuit includes a phase adjustment circuit, a divider circuit, a phase difference detection circuit, and a duty control circuit. The phase adjustment circuit adjusts a duty cycle of a first input clock signal according to a plurality of control codes to generate a duty corrected clock signal. The divider circuit divides the duty corrected clock signal to generate a plurality of multi-phase clock signals. The phase difference detection circuit detects phase differences between the plurality of multi-phase clock signals to generate detection signals. The duty control circuit detects a bang-bang state of the duty corrected clock signal in accordance with the detection signals, changes values of the plurality of control codes by a first unit in accordance with the detection signals until the bang-bang state is detected, and adjusts the value of the plurality of control codes by a second unit smaller than the first unit when the bang-bang state is detected.