Comparator Startup Mode Control for Glitch-Free Switch Signals
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Solution Overview
Problem
Existing methods for detecting and limiting glitch signals in logic circuits are ineffective when an analog circuit operates before a digital circuit starts, leading to potential malfunctions in systems controlled by comparator circuits.
Innovation Solution
A comparator circuit with a mode controller that applies a lower operating voltage and reference voltage for a predetermined delay time after power supply initiation, using a delay signal generator, voltage controller, and mode selector to stabilize the circuit and prevent glitch signal generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the comparator circuit operates immediately upon power supply, then response speed is improved, but glitch signal generation increases
Solution Approach 1:
The patent implements periodic action through a time-delay mechanism that switches the reference voltage applied to the comparator. A delay signal generator produces a delayed control signal that periodically changes the comparator's operating state: initially applying a first reference voltage, then after a predetermined delay, switching to a second reference voltage. This periodic voltage switching suppresses glitch generation while maintaining eventual fast response.
Data Source
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AI summary
The present invention relates to a comparator circuit and a switch control device including the same. The comparator circuit may include: a comparator including a first input terminal and a second input terminal, which receive an input voltage and a reference voltage, respectively, an output terminal which outputs an output signal according to a result of a comparison between the input voltage and the reference voltage, and a power supply terminal which receives an operating voltage; and a mode controller which configured to apply a first operating voltage and a first reference voltage to the second input terminal and the power supply terminal of the comparator for a predetermined delay time when a supply of power is initiated from a power supply, and apply a second operating voltage and a second reference voltage to the second input terminal and the power supply terminal of the comparator after the delay time elapses. Herein, the first operating voltage may be higher than a ground voltage and be lower than the second operating voltage