Programmable Synchronous Clock Divider for Duty Cycle Stability
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Solution Overview
Problem
Integrated circuits face duty cycle degradation due to aging and chip variations, which affect data paths and require precise control over clock signal duty cycles to maintain operational stability.
Innovation Solution
A synchronous clock divider with programmable duty cycle and divide ratio is implemented, utilizing sequential logic elements, counters, comparators, and multiplexers to generate divided clock signals with adjustable duty cycles, allowing for dynamic control of clock frequency and timing relaxation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional clock divider circuit is used, then the clock frequency can be divided, but the duty cycle cannot be controlled or adjusted to compensate for aging-induced shifts
Solution Approach 1:
The clock divider circuit is designed with programmable duty cycle control, allowing the duty cycle to be dynamically adjusted based on aging conditions. The circuit transitions from a fixed duty cycle implementation to one where the duty cycle can be modified through control signals, enabling compensation for aging-induced duty cycle shifts while maintaining reliable operation
Solution Approach 2:
The invention changes the duty cycle parameter of the clock signal by introducing programmable control mechanisms. By modifying the duty cycle parameter in response to detected aging shifts, the system compensates for reliability degradation. The control logic adjusts the duty cycle parameter based on sensed conditions, transforming a static parameter into a controllable variable that adapts to aging effects
2Speed
If the clock frequency is changed by changing divide ratios, then the cycling rate can be adjusted, but the duty cycle degradation due to aging and chip variations cannot be compensated
Solution Approach 1:
The clock divider incorporates feedback mechanisms that monitor the actual duty cycle of the generated clock signal and compare it against target values. Based on this feedback, the control logic adjusts the divide ratio and duty cycle parameters to compensate for aging and chip variations. This closed-loop approach ensures that both the clock cycling rate and duty cycle accuracy are maintained despite environmental changes and component degradation
3Device complexity
If sequential logic elements are used with fixed divide ratios, then the circuit structure is simple, but the timing relaxation of half cycle paths cannot be provided
Solution Approach 1:
The clock divider circuit is designed to perform multiple functions: frequency division, duty cycle adjustment, and timing relaxation provision. By integrating these functions into a single unified circuit structure, the system achieves adaptability without proportionally increasing complexity. The same sequential logic elements and control mechanisms serve both the basic frequency division and the advanced timing relaxation functions, making the circuit versatile while maintaining reasonable complexity
Data Source
AI summary
A divided clock signal is generated from an input clock signal. The duty cycle of the divided clock signal is programmed by generating a compare value based on values of duty cycle input and a divide value of the input clock signal. The compare value is compared to a count value to generate short and long pulse signals. The divided clock signal is generated based on the short and long pulse signals. The duty cycle of the divided clock signal varies in accordance with the compare value.