MOSFET Comparator Voltage Detection for Variable Low-Voltage Thresholds
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Solution Overview
Problem
Existing low voltage detectors have a large circuit scale and fixed detectable voltage values, making them independent of semiconductor process variations and temperature, which limits their efficiency and flexibility.
Innovation Solution
A voltage detector using a comparison unit with multiple MOSFET-based comparators and a determination unit that compares threshold and input voltages, allowing for variable detection and reduced circuit complexity by adjusting transistor sizes and determination voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a low voltage detector is designed to be independent of semiconductor process variation and temperature, then detection reliability is improved, but circuit scale increases
Solution Approach 1:
The detection circuit is divided into multiple independent comparator units, each responsible for detecting a specific voltage threshold. Each comparator is further segmented into operational amplification portions and determination portions. This segmentation allows the circuit to achieve temperature and process independence through distributed detection while reducing the scale of each individual unit compared to a monolithic design.
Solution Approach 2:
The patent introduces a multi-dimensional detection approach by using multiple comparators operating at different voltage thresholds simultaneously. Instead of a single detection point, the system evaluates voltage across multiple dimensions (threshold levels), allowing reliable detection through logical combination of results while maintaining compact circuit scale through shared determination logic.
2Adaptability or versatility
If multiple comparators are used to detect variable voltage thresholds, then adaptability is improved, but device complexity increases
Solution Approach 1:
Each comparator unit is designed as a universal module that can detect any voltage threshold by adjusting its reference voltage. The determination portion of each comparator is multi-functional, handling both threshold comparison and result aggregation. This universality allows the system to detect variable voltage thresholds while avoiding the complexity of designing separate circuits for each threshold level.
Solution Approach 2:
The system dynamically adjusts the detection threshold by selectively activating or weighting different comparator units based on operating conditions. The determination portion dynamically combines results from multiple comparators, allowing the effective detection threshold to adapt to varying voltage requirements without requiring physical reconfiguration of the circuit architecture.
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 solution reduces circuit scale, makes detectable voltage values variable, and improves efficiency by aligning threshold voltages with operation limit voltages that change with temperature, enabling more accurate and flexible low voltage detection.
Implementation Method 1
a comparison unit which has a plurality of comparators each including MOSFETs
Data Source
AI summary
A voltage detector includes a comparison unit which is equipped with a plurality of comparators and which is configured to compare a threshold voltage and determination voltages corresponding to each comparator and output a first result of High or Low for each comparator and configured to compare an input voltage and the determination voltages and output a second result of High or Low for each comparator, and a determination unit configured to determine based on the first result and the second result whether or not the input voltage is less than or equal to the threshold voltage.