Comparator Circuit Threshold Path for High-Voltage Output Swing
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Solution Overview
Problem
Conventional comparator circuits face challenges in ensuring a sufficiently large amplitude output voltage when detecting high voltages, due to the reference voltage being inputted into the current path that forms the output terminal.
Innovation Solution
The comparator circuit design includes a configuration where the reference voltage is used as a switching threshold, eliminating its input into the current path that generates the output signal, allowing the output signal to vary in level based on whether the target voltage exceeds the threshold, thereby ensuring a large amplitude output even for high voltages detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the reference voltage is inputted to the current path that forms the output terminal, then the comparator circuit can detect the target voltage, but the output voltage amplitude becomes insufficient when detecting high voltages
Solution Approach 1:
The patent divides the comparator circuit into separate functional paths: a reference voltage path (using transistors Tr21-Tr24) and a target voltage detection path (using transistors Tr11-Tr14). The reference voltage is processed independently to generate a threshold signal, which is then compared against the target voltage in the second path. This segmentation prevents the reference voltage from degrading the output amplitude while maintaining detection precision.
Solution Approach 2:
The patent introduces an intermediate threshold voltage signal generated by the reference voltage path as a mediator. This threshold signal serves as the comparison reference for the target voltage detection, eliminating the need to directly input the reference voltage into the output current path. The intermediary threshold signal enables accurate voltage comparison while preserving output signal amplitude.
2Adaptability or versatility
If the reference voltage is inputted to the current path that forms the output terminal, then the comparator circuit can establish a switching threshold, but the output signal amplitude is reduced
Solution Approach 1:
The circuit segments the threshold control function from the output signal generation function. The reference voltage path (Tr21-Tr24) independently establishes the switching threshold, while the target voltage path (Tr11-Tr14) generates the output signal. This separation allows full utilization of the power supply voltage range for the output signal without being constrained by the reference voltage input requirements.
Solution Approach 2:
The patent transitions from a single-path architecture to a two-dimensional architecture with independent reference and target voltage processing paths. This dimensional separation enables the output signal to operate in the full voltage dimension (from ground to VDD) while the reference voltage operates in its own independent dimension for threshold control, eliminating the amplitude limitation.
3Reliability
If the reference voltage is inputted to the current path that forms the output terminal, then the comparator circuit can function, but high voltage detection results in insufficient output amplitude
Solution Approach 1:
The patent segments the comparator into independent reference processing and target voltage detection sections. The reference voltage path (Tr21-Tr24) reliably establishes the threshold without interfering with the output path. When detecting high voltages, the target voltage path can fully utilize the power supply voltage swing, ensuring sufficient output amplitude while maintaining reliable comparator operation through the separated reference path.
Data Source
AI summary
A comparator circuit, includes a first power source terminal having a first potential, a second power source terminal having a second potential different from the first potential, a detection voltage terminal, a reference voltage generator coupled between the first power source terminal and the second power source terminal, the reference voltage generator generating a middle potential which is a potential between the first potential and the second potential and outputting the middle potential at a middle potential node, the reference voltage generator further generating a reference voltage, a bias unit coupled between the first power source terminal and the middle potential node, the bias unit receiving the reference voltage and generating a corresponding reference voltage by using the first potential and the middle potential as energy sources thereof, and a comparator unit coupled between the first and second power source terminals and the detection voltage terminal.