Hysteresis Amplifier Circuit for False Edge Trigger Suppression
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Solution Overview
Problem
Amplifiers with hysteresis stages introduce non-linearities in voltage response, causing undesirable state changes at threshold points, leading to false edge triggers and duty cycle variations in downstream devices.
Innovation Solution
Incorporating a hysteresis inverter with distinct voltage threshold switching points for rising and falling voltages, positioned between the non-linearities introduced by the hysteresis stage, to inhibit output state changes within the hysteresis margin, thereby eliminating the effects of non-linearities and reducing duty cycle variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a hysteresis stage is introduced to provide hysteresis to the cascode output, then the output stability is improved, but non-linearities are introduced in the voltage response causing false edge triggers and duty cycle variations
Solution Approach 1:
A hysteresis inverter is introduced as an intermediary component between the cascode output and the feedback stage. This inverter acts as a mediator that filters out the non-linear voltage transitions by only responding to voltage changes that exceed its hysteresis threshold, thereby preventing false edge triggers while preserving the stability-providing hysteresis effect.
Solution Approach 2:
The hysteresis inverter is configured with specific voltage threshold switching points that are higher than the non-linearity points of the hysteresis stage. By changing the threshold parameter of the inverter to be above the non-linear region, the system filters out unwanted voltage fluctuations while maintaining the desired hysteresis behavior.
2Duration of action of stationary object
If the hysteresis stage is used to maintain output states, then duty cycle variations are reduced, but non-linearities cause undesirable state changes at threshold points
Solution Approach 1:
The hysteresis inverter serves as a filtering intermediary that prevents the non-linear voltage transitions from causing unwanted state changes. It mediates between the hysteresis stage output and the rest of the circuit, allowing only clean, threshold-exceeding transitions to propagate.
Solution Approach 2:
By setting the voltage threshold switching points of the hysteresis inverter above the non-linearity points of the hysteresis stage, the system achieves precise state changes only when intended, filtering out spurious transitions while maintaining duty cycle stability.
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 hysteresis inverter effectively prevents false edge triggers and duty cycle variations by setting voltage threshold switching points outside the non-linear regions, ensuring stable output states and improved performance in amplifiers.
Implementation Method 1
the hysteresis inverter is configured so that a non-linearity in the voltage response of the cascode output introduced by the hysteresis stage is between the voltage threshold switch points of the hysteresis inverter
Data Source
AI summary
An amplifier includes a differential input stage, a hysteresis stage, coupled to the differential input stage, a cascode stage coupled to the hysteresis stage, a feedback stage coupled to an output of the cascode stage and configured to provide a feedback signal to the hysteresis stage, and an output stage coupled to the output of the cascode stage. The output stage includes a hysteresis inverter coupled between the output of the cascode stage and the amplifier output.