Multi-Phase Clock Switching Circuit for Glitch-Free Phase Handover
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Solution Overview
Problem
Conventional multi-phase clock switching devices experience a 'glitch' phenomenon, leading to discontinuous output signals and signal quality issues due to the switching of phase clock signals, which affects circuit performance.
Innovation Solution
A multi-phase clock switching device with a protection unit and selection unit that determines the output of phase clock signals based on a switching signal, ensuring continuous output signals by disabling or enabling the selection signal based on the voltage level of the phase clock signals, thereby preventing glitches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional phase selection circuits switch phase clock signals based on switching signals, then clock phase switching functionality is achieved, but glitch phenomenon occurs causing discontinuous output signals
Solution Approach 1:
The protection unit checks the voltage level of the target phase clock signal before enabling the selection signal. This preliminary action ensures that the selection signal is only activated when the target clock signal is at a valid state (second voltage level), preventing glitches caused by switching to invalid states (first voltage level).
Solution Approach 2:
The protection unit continuously monitors the voltage level of the phase clock signal and uses this feedback information to control the selection signal. When the voltage level indicates an invalid state, the protection unit disables the selection signal, creating a feedback mechanism that maintains output continuity and eliminates glitches.
2Adaptability or versatility
If phase selection circuits enable switching between multiple phase clock signals, then phase adjustment capability is improved, but signal quality deteriorates due to glitch phenomenon
Solution Approach 1:
Before allowing phase clock signal switching, the protection unit performs a preliminary check of the voltage level. This ensures that switching only occurs when the target signal is valid, maintaining high signal quality while preserving phase adjustment capability.
Solution Approach 2:
The invention converts the potentially harmful glitch phenomenon into a beneficial validation mechanism. By using voltage level checking to prevent invalid switching, the system transforms what could be a source of errors into a quality assurance mechanism that enhances signal integrity.
3Speed
If the selection signal is always enabled for phase clock switching, then switching speed is improved, but output continuity is compromised causing glitches
Solution Approach 1:
The protection unit performs a quick voltage level check before enabling the selection signal. This preliminary action adds minimal delay while ensuring that switching only occurs when valid, maintaining both speed and continuity.
Solution Approach 2:
The invention dynamically changes the state of the selection signal based on the voltage level parameter of the phase clock signal. When the voltage level indicates an invalid state, the selection signal is disabled; when valid, it is enabled. This parameter-based control maintains switching speed while ensuring output continuity.
Data Source
AI summary
A multi-phase clock switching device includes a plurality of phase selection circuits. The phase selection circuit is used to receive a plurality of phase clock signals and determine how to output the phase clock signals to generate an output signal according to a switching signal. The phase selection circuit includes a selection unit and a protection unit. The selection unit receives at least a phase clock signal and determines how to output a phase clock signal according to the at least a phase clock signal and a selection signal. The protection unit determines how to generate the selection signal according to the phase clock signal and the switching signal.