Comparator Feedback Circuit for Immediate Output Level Restoration
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Solution Overview
Problem
Conventional comparators generate output signals based on the comparison between two voltages, but they do not immediately switch back to the original level after a change, which is not suitable for all applications requiring immediate level restoration.
Innovation Solution
A comparator design incorporating a differential amplifying circuit, an output section, and a feedback circuit that allows the output signal to change levels when intersecting a reference voltage and then immediately restore to the original level, utilizing P-channel MOSFETs and a feedback control circuit to invert the signal and feed it back to the differential amplifying circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional comparator is used to generate output signals based on voltage comparison, then the comparator can indicate when V1>V2 or V1<V2, but the output signal cannot immediately restore to the original level after a level change
Solution Approach 1:
The patent applies feedback by connecting the output signal back to the differential amplifying circuit through a feedback circuit. When the output signal changes level, the feedback mechanism automatically restores it to the original level, enabling immediate level restoration without requiring complex external circuitry.
Solution Approach 2:
The comparator is divided into distinct functional sections: a differential amplifying circuit for voltage comparison, an output section for signal generation, and a feedback circuit for level restoration. This segmentation allows each part to perform its specific function efficiently while working together to achieve the overall goal of immediate output level restoration.
2Reliability
If the comparator generates an output signal that changes level when voltages intersect, then the comparison function is achieved, but the output signal remains at the changed level instead of restoring immediately
Solution Approach 1:
The feedback circuit continuously monitors the output signal level and automatically triggers restoration when a level change is detected. This feedback mechanism ensures the output signal consistently returns to its original level immediately after comparison, eliminating timing delays and ensuring reliable, predictable behavior.
Solution Approach 2:
The feedback circuit is pre-configured to immediately activate upon detecting a level change in the output signal. This preliminary preparation ensures that the restoration action occurs instantaneously without delay, maintaining consistent and reliable output signal behavior.
Data Source
AI summary
The present invention provides a comparator with novel output logic. The comparator makes a comparison between an input voltage and a reference voltage. A differential amplifying circuit includes a first input transistor with a control terminal applied with the reference voltage and a second input transistor with a control terminal applied with the input voltage. An output section receives an export signal of the differential amplifying circuit and outputs an output signal that corresponds to the export signal and denotes a result of the comparison. A feedback circuit receives the output signal of the output section, and if the output signal is changed from a first level to a second level, the output signal feeds back to the differential amplifying circuit or the output section while it is restored to the negated level.