Duty Cycle Correction With Dynamic Edge Shift and Skew Control
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Solution Overview
Problem
In digital electronics, duty cycle correction circuits face challenges in maintaining precise timing of clock signals as they pass through complex chip designs, leading to phase misalignment and variability, which can impact the functionality and reliability of VLSI chips.
Innovation Solution
A duty cycle correction device with a main signal path and a reference signal path, utilizing programmable delay circuits and a skew control arrangement to adjust the timing of the active edge of the signal, allowing continuous adjustment of the duty cycle correction circuit and programmable delay based on a reference signal to minimize skew between the reference clock and output clock.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If duty cycle correction circuits are used to correct duty cycle, then duty cycle precision is improved, but phase misalignment and timing variability increase
Solution Approach 1:
The patent implements a feedback mechanism where the skew control arrangement continuously monitors the timing relationship between the output clock signal and reference clock signal, and dynamically adjusts the programmable delay circuit to minimize skew. This closed-loop feedback system resolves the contradiction by automatically compensating for phase misalignment introduced by the duty cycle correction circuit, thereby maintaining both duty cycle precision and phase alignment reliability.
Solution Approach 2:
The patent changes the delay parameter of the programmable delay circuit dynamically based on the detected skew between clock signals. By adjusting the delay parameter in response to operating conditions, the system maintains accurate timing relationships despite the phase misalignment effects introduced by duty cycle correction, thus resolving the contradiction between duty cycle precision and phase alignment reliability.
2Reliability
If programmable delay circuits are added to compensate phase misalignment, then phase alignment is improved, but device complexity increases
Solution Approach 1:
The programmable delay circuit in the patent serves multiple functions: it compensates for phase misalignment, adjusts timing variability, and works with the skew control arrangement to maintain overall timing accuracy. By making this single circuit element multi-functional, the patent reduces the need for additional separate circuits, thereby improving phase alignment without proportionally increasing device complexity.
Solution Approach 2:
The patent combines the duty cycle correction circuit and the programmable delay circuit into an integrated duty cycle correction device with a unified control mechanism. The skew control arrangement merges the control of both circuits, allowing them to work together as a coordinated system rather than separate independent circuits, thus reducing overall device complexity while maintaining phase alignment reliability.
3Measurement precision
If skew control arrangement is implemented to minimize skew, then timing precision is improved, but additional electronic circuits are required
Solution Approach 1:
The skew control arrangement operates autonomously to detect and correct timing skew between clock signals without requiring external intervention or additional complex control logic. The system self-adjusts the programmable delay circuit based on its own measurements of skew, thereby improving timing precision while minimizing the need for additional external circuits or complex external control mechanisms.
Data Source
AI summary
A duty cycle correction device may be provided for correcting a duty cycle of an input signal. The device includes a first duty cycle correction circuit. The first duty cycle correction circuit receives the input signal. The first duty cycle correction circuit generates a first intermediate signal. The device includes a first programmable delay circuit. The first programmable delay circuit is controlled by a first delay control signal. The first programmable delay circuit receives the first intermediate signal. The first programmable delay circuit generates an output signal. The device includes a second duty cycle correction circuit. The second duty cycle correction circuit receives the input signal. The second duty cycle correction circuit generates a second intermediate signal. The device includes a second programmable delay circuit. The second programmable delay circuit generates a reference signal. The device includes a skew control arrangement operable for generating the first delay control signal.