Comparator Hysteresis Circuit Decoupled From Reference Voltage
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Solution Overview
Problem
Conventional comparing circuits with hysteresis are affected by reference voltage, leading to reduced accuracy due to variable hysteresis voltage, and they struggle to maintain noise tolerance and sensitivity simultaneously.
Innovation Solution
A comparing circuit and module design that operates in both hysteresis and high gain modes, featuring a coupling module with adjustable transistor coupling relations and current amplification circuits, allowing the hysteresis voltage to be independent of the reference voltage and enabling adjustable gain by varying transistor sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hysteresis voltage is introduced to improve noise tolerance, then noise tolerance is improved, but hysteresis voltage becomes affected by reference voltage causing reduced accuracy
Solution Approach 1:
The patent divides the comparing circuit into separate functional modules: an input circuit that receives voltages, a coupling module with independent hysteresis control, and an output circuit. The hysteresis control module is segmented from the reference voltage input path, allowing independent adjustment of hysteresis voltage without being influenced by reference voltage variations, thus resolving the contradiction between noise tolerance and accuracy.
Solution Approach 2:
The patent implements preliminary action by providing an adjustable hysteresis control module that can pre-set the hysteresis voltage to a fixed value before comparison operations. This pre-established hysteresis voltage remains stable and unaffected by subsequent reference voltage changes, ensuring both noise tolerance and measurement accuracy are maintained.
2Reliability
If hysteresis mode is used to provide noise tolerance, then noise tolerance is improved, but gain is reduced affecting rapid response capability
Solution Approach 1:
The patent implements dynamic operation by allowing the comparing circuit to switch between hysteresis mode and high gain mode based on operational requirements. The coupling module can dynamically adjust its coupling relation and the adjustable hysteresis control module can modify hysteresis voltage, enabling the circuit to adapt between noise tolerance priority and response speed priority, thus resolving the contradiction between reliability and speed.
Data Source
AI summary
A comparing circuit and a comparing module with hysteresis are provided. The comparing module includes a first resistor, a second resistor, and the comparing circuit, which are electrically connected to each other. A comparison voltage is determined according to an input voltage and the resistances of the first resistor and the second resistor. The comparing circuit includes an input circuit, an eternal circuit, and a coupling module. The coupling module includes a first coupling transistor, a second coupling transistor, a third transistor, and a fourth coupling resistor. Control terminals of the first coupling transistor and the second coupling transistor are selectively electrically connected to either one of a first terminal and a second terminal. The second terminals of the third coupling transistor and the fourth coupling transistor are selectively electrically connected to either one of the first terminal and the second terminal.