Clock Buffer Enable Logic for Noise-Free Startup Synchronization
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Solution Overview
Problem
In transmission protocols, when switching from power-saving mode to normal mode, device-end circuits may mistakenly synchronize with noise signals during the clock generator's startup period, leading to malfunctioning due to the lack of noise detection in the clock signal.
Innovation Solution
A clock output device and method that includes a noise detector circuit and a clock buffer circuit, where the noise detector determines whether a reference clock signal is noise based on common-mode level or frequency, generating an enable signal to enable the clock buffer circuit only when the signal is valid, preventing synchronization with noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the device-end circuit starts up immediately after switching from power-saving mode, then the response speed is improved, but the circuit may synchronize with noise signals causing malfunctions
Solution Approach 1:
The noise detector circuit is enabled before the clock buffer circuit to detect and validate the reference clock signal in advance. This preliminary detection ensures that only valid clock signals are passed to the clock buffer, preventing noise-induced synchronization errors while maintaining fast response after validation.
Solution Approach 2:
The noise detector circuit acts as an intermediary between the reference clock signal input and the clock buffer circuit. It validates the signal quality and generates an enable signal only when the clock signal is confirmed to be valid, thereby mediating the transition from power-saving mode to normal operation safely.
2Loss of time
If the clock buffer circuit is enabled immediately, then the clock signal is provided faster, but noise signals may cause incorrect synchronization
Solution Approach 1:
The noise detector circuit performs preliminary validation of the reference clock signal before enabling the clock buffer circuit. This advance detection minimizes the time loss by validating the signal early, while simultaneously protecting against noise impacts by ensuring only valid signals trigger the clock buffer.
Solution Approach 2:
The noise detector circuit applies preliminary anti-action by detecting and blocking noise signals before they can affect the clock buffer circuit. The enable signal is generated only after confirming the absence of noise, thereby preventing harmful synchronization errors before they occur.
3Reliability
If noise detection is added to the clock signal path, then the reliability is improved, but the device complexity increases
Solution Approach 1:
A dedicated noise detector circuit is introduced as an intermediary component to handle the complex noise detection function. This separates the detection logic from the clock buffering function, improving reliability while keeping the overall architecture modular and manageable despite the added complexity.
Data Source
AI summary
A clock output device includes a noise detector circuit and a clock buffer circuit. The noise detector circuit is configured to be enabled according to a request signal to determine whether a reference clock signal is a noise according to at least one of a common-mode level or a frequency of the reference clock signal and generate an enable signal. The clock buffer circuit is configured to be enabled according to the enable signal to generate an output clock signal according to the reference clock signal.