Adaptive Clock Slicer Using Dynamic Hysteresis for Noise Immunity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional clock signal generators are susceptible to noise interference, which affects the duty cycle of the clock signal, and differential circuit structures used to mitigate this issue consume significant power, making them unsuitable for many applications.
Innovation Solution
An adaptive clock signal generator with a noise detector that dynamically adjusts the hysteresis window of an adjustable Schmitt trigger and the gain amplifier to maintain noise immunity, reducing power consumption and avoiding duty cycle deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a traditional clock slicer is used to convert analog signal to square signal, then the circuit structure is simple, but the duty cycle of the square signal deviates from ideal value due to noise interference
Solution Approach 1:
The patent implements a dynamic hysteresis window that automatically adjusts its width based on the noise level detected in the clock signal. The hysteresis comparator changes its threshold characteristics in real-time to match the noise conditions, providing optimal noise immunity without requiring manual intervention or complex fixed structures.
Solution Approach 2:
The patent employs a feedback mechanism where the output signal is fed back to the hysteresis comparator to dynamically adjust the hysteresis window. This feedback loop continuously monitors the signal conditions and adapts the noise filtering characteristics, ensuring the duty cycle remains accurate even in noisy environments.
2Reliability
If a differential circuit structure is used to reduce noise interference, then the noise immunity is improved, but the power consumption increases significantly
Solution Approach 1:
The patent changes the hysteresis parameter dynamically based on noise conditions rather than using a fixed differential structure. By adjusting the hysteresis window width according to the detected noise level, the circuit achieves noise immunity comparable to differential structures but with significantly lower power consumption suitable for portable devices.
3Stability of the object's composition
If a fixed hysteresis window is used in the Schmitt trigger, then the circuit operation is stable, but the duty cycle is affected by varying noise levels
Solution Approach 1:
The patent transforms the fixed hysteresis window into a dynamic one that adapts to varying noise conditions. The hysteresis comparator modifies its threshold characteristics in real-time based on the noise level, maintaining circuit stability while ensuring accurate duty cycle output even when noise conditions change.
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 adaptive clock signal generator effectively reduces noise interference on the clock signal, maintaining an ideal duty cycle and preventing glitches, thereby enhancing noise immunity while minimizing power usage.
Implementation Method 1
an adjustable Schmitt trigger, coupled with an output terminal of the gain amplifier, for generating a triggered signal according to the amplified signal
Implementation Method 2
when the noise detector is coupled with a first input signal, the noise detector detects noise components of the first input signal
Data Source
AI summary
An adaptive clock signal generator with noise immunity capability is disclosed, including a gain amplifier for processing an analog oscillation signal to generate an amplified signal; an adjustable Schmitt trigger, coupled with the gain amplifier, for generating a triggered signal according to the amplified signal; an output buffer, coupled with the adjustable Schmitt trigger, for generating a clock signal according to the triggered signal; and a noise detector coupled with the adjustable Schmitt trigger. The noise detector detects noise components of an input signal and enlarges the hysteresis window of the adjustable Schmitt trigger as the level of detected noise increases.