Adaptive Clock Slicer Using Dynamic Schmitt Trigger Hysteresis
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Solution Overview
Problem
Traditional clock signal generators in communication devices are susceptible to noise interference, which affects the duty cycle of the clock signal, and existing differential circuit structures consume excessive 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 of a gain amplifier based on detected noise levels, using a capacitive device, rectifier, and analog-to-digital converter to generate a noise-immune clock signal.
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 resulting square signal deviates from ideal value due to noise interference
Solution Approach 1:
The patent implements a feedback mechanism where the duty cycle detector continuously monitors the output square signal and feeds back control signals to the adjustable Schmitt trigger. This feedback loop dynamically adjusts the hysteresis window to compensate for noise-induced duty cycle deviations, maintaining ideal duty cycle accuracy while using a simple circuit structure.
Solution Approach 2:
The patent employs an adjustable Schmitt trigger with dynamically controllable hysteresis window rather than a fixed threshold circuit. The hysteresis window is adaptively adjusted based on noise conditions and duty cycle measurements, enabling the circuit to maintain reliability under varying noise conditions without increasing structural complexity.
2Object-affected harmful factors
If a differential circuit structure is used to reduce noise interference, then the noise immunity is improved, but the power consumption increases considerably
Solution Approach 1:
The patent introduces a duty cycle detector and control circuit as an intermediary mechanism that monitors and compensates for noise effects. Instead of using a power-hungry differential structure, this intermediary system detects duty cycle deviations caused by noise and generates corrective control signals, achieving noise immunity through intelligent control rather than structural redundancy.
Solution Approach 2:
The clock signal generator performs self-correction by continuously monitoring its own output duty cycle and automatically adjusting its internal parameters through feedback control. This self-service mechanism eliminates the need for external noise cancellation circuits or differential structures, significantly reducing power consumption while maintaining noise immunity.
3Object-affected harmful factors
If the hysteresis window of Schmitt trigger is increased to reduce noise sensitivity, then the noise immunity is improved, but the duty cycle control precision deteriorates
Solution Approach 1:
The patent makes the hysteresis window dynamically adjustable rather than fixed. The adjustable Schmitt trigger receives control signals that modify its hysteresis width in real-time based on operating conditions and noise levels. This dynamic adjustment allows the circuit to achieve both noise immunity and duty cycle precision by optimizing the hysteresis window size for each specific condition.
Solution Approach 2:
The patent changes the hysteresis window parameter adaptively based on detected duty cycle deviations and noise conditions. By varying this critical parameter rather than maintaining a constant value, the system achieves both noise rejection and precise duty cycle control, resolving the contradiction between noise immunity and control precision.
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, maintains ideal duty cycle, and minimizes power consumption, enhancing noise immunity and preventing glitches in the clock signal.
Implementation Method 1
The noise detector comprises a capacitive device for extracting AC components of the first input signal when coupled with the first input signal
Implementation Method 2
a rectifier, coupled with the capacitive device, for generating a rectified signal according to an output signal of the capacitive device
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.