Long Delay Line Feedback Circuit for Pulse Width Stability
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Solution Overview
Problem
Conventional delay lines suffer from significant duty cycle degradation due to process, voltage, and temperature variations, leading to pulse width reduction and eventual propagation failure in long delay lines.
Innovation Solution
Implementing a feedback mechanism where the output terminal of each delay element is coupled to the reset terminal of the preceding element, ensuring that pulse transitions are completed before the current stage is reset, thereby maintaining a minimum pulse width throughout the delay line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the delay line is extended to increase total delay time, then the delay duration is improved, but the pulse width degrades and propagation fails
Solution Approach 1:
The patent implements a feedback mechanism where the output of each delay element is fed back to its own reset input. This feedback loop ensures that the pulse width is regenerated at each stage, preventing the cumulative degradation that occurs in conventional delay lines. The feedback allows the system to maintain reliable signal propagation over extended delay durations by continuously replenishing the pulse width.
2Duration of action of moving object
If more delay elements are added to increase total delay, then the delay time is improved, but the duty cycle degrades
Solution Approach 1:
By connecting the output of each delay element to its reset input, the feedback mechanism continuously monitors and regenerates the pulse width. This prevents the duty cycle from degrading as more elements are added, allowing the delay line to achieve longer total delay times while maintaining stable duty cycle characteristics throughout the chain.
3Device complexity
If conventional delay elements are used without feedback, then the device complexity is reduced, but the pulse width reduces and propagation ceases
Solution Approach 1:
The feedback connection from output to reset input adds minimal complexity to each delay element while dramatically improving signal propagation reliability. This simple feedback mechanism prevents pulse width reduction and ensures continuous propagation, even in long delay lines with many elements.
Data Source
AI summary
Systems and methods for transmitting signals through long delay lines are discussed. In some embodiments, a delay line may include: (i) a first delay element comprising: a first input terminal, a first output terminal, and a first reset terminal; and (ii) a second delay element comprising: a second input terminal coupled to the first output terminal, and a second output terminal coupled to the first reset terminal. In other embodiments, a method may include coupling an input terminal of a delay element to an output terminal of a preceding delay element, and coupling an output terminal of the delay element to a reset terminal of the preceding delay element.