Multi-Stage Deglitch Circuit for Broad Glitch Elimination
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Solution Overview
Problem
Conventional deglitch circuits in high-speed transmission systems are limited in eliminating broad glitches and suffer from variable delay times due to fabrication process variations, making them ineffective at higher speeds and longer cable lengths, and peak detectors struggle with controlling propagation delay and accurate DC transition points.
Innovation Solution
A deglitch circuit comprising a series of signal transmission units with switches, delay circuits, and capacitors that synchronously output logic states to delay and eliminate glitches by adjusting the number of signal transmission units and delay times, allowing for flexible glitch removal regardless of glitch width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional delay circuit is used to eliminate glitches, then narrow glitches can be removed, but broad glitches cannot be eliminated and delay time drifts with fabrication process
Solution Approach 1:
The deglitch circuit is divided into multiple identical stages (first stage, second stage, third stage, etc.), each comprising a delay circuit and a selection circuit. This segmentation allows the circuit to handle broader glitches by chaining multiple delay stages, where each stage processes a portion of the glitch duration. The segmented structure also provides process variation immunity because identical stages compensate for each other's delay drift.
Solution Approach 2:
The circuit dynamically selects which stage output to use based on the actual glitch width. The selection circuit (multiplexer) chooses from multiple delay stage outputs, allowing the circuit to adapt to different glitch durations. This dynamic selection ensures that regardless of fabrication process variations or different glitch widths, the appropriate delay stage can be selected to eliminate the glitch effectively.
2Reliability
If delay time is increased to eliminate broader glitches, then more glitches can be removed, but propagation delay increases and affects transmission speed
Solution Approach 1:
The circuit dynamically adjusts the effective delay time by selecting from multiple delay stages based on the actual glitch width. Instead of using a fixed large delay that would slow down all transmissions, the selection circuit chooses the minimum necessary delay for each incoming signal, eliminating glitches only when needed while maintaining high speed for valid data transitions.
Solution Approach 2:
The circuit changes the delay parameter adaptively by selecting different delay stage outputs. Each stage provides a different delay amount, and the selection circuit chooses the appropriate delay parameter based on the detected glitch characteristics, thus eliminating glitches when necessary while minimizing delay for normal operations.
3Reliability
If multiple delay stages are added to eliminate broad glitches, then glitch elimination improves, but circuit complexity increases
Solution Approach 1:
The circuit is segmented into identical modular stages, each with the same structure (delay circuit + selection circuit). This modular segmentation allows systematic extension to handle broader glitches by simply adding more identical stages rather than designing complex unique circuits, making the complexity increase manageable and scalable.
Solution Approach 2:
Each delay stage and selection circuit unit is designed to be universal and multi-functional, capable of handling different glitch widths and working under various fabrication processes. The identical stages can be replicated to handle different scenarios, reducing the need for different complex circuit designs for different applications.
4Adaptability or versatility
If transmission cable length increases, then more scenarios are covered, but glitch width becomes broader and exceeds conventional deglitch capability
Solution Approach 1:
The deglitch circuit uses multiple segmented delay stages that can be chained to provide cumulative delay time. This segmentation allows the circuit to handle progressively broader glitches that occur with longer transmission cables, as each stage adds to the total delay capability without requiring a completely different circuit architecture.
Solution Approach 2:
The circuit dynamically adapts to different cable lengths by selecting the appropriate delay stage output based on the detected glitch width. Longer cables producing broader glitches can utilize later delay stages, while shorter cables use earlier stages, providing automatic adaptation to different transmission scenarios.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed deglitch circuit effectively eliminates glitches across varying conditions by synchronously outputting logic states, allowing for precise control of propagation delay and ensuring accurate AC and DC transition points, enhancing the reliability of high-speed transmission systems.
Implementation Method 1
a first delay circuit and a second delay circuit, wherein an input terminal of the first delay circuit is coupled to a second terminal of the first switch, and an input terminal of the second delay circuit is coupled to an output terminal of the first inverter
Implementation Method 2
the first delay circuit includes a first resistor and a first capacitor. A first terminal of the first resistor is coupled to the second terminal of the first switch. The first capacitor is coupled between a second terminal of the first resistor and a second voltage
Data Source
AI summary
A deglitch circuit including signal transmission units is provided. The signal transmission units are connected in serial to form a signal transmission unit string, and a first signal transmission unit of the signal transmission unit string receives a digital signal. Each signal transmission unit includes a first switch, a first delay circuit and a second switch. First and second terminals of the first switch are coupled to a previous signal transmission unit of the signal transmission unit string and an input terminal of the first delay circuit, respectively. The second switch is coupled between an output terminal of the first delay circuit and a first voltage. When the digital signal has a first logic state, the first switch is turned off, and the second switch is turned on. When the digital signal has a second logic state, the first switch is turned on, and the second switch is turned off.


