Multi-Hysteresis Sensing Circuit for Accurate Signal Interval Detection
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Solution Overview
Problem
Conventional hysteresis sensing circuits have limitations with single thresholds and inflexible hysteresis voltage settings, making them ineffective in accurately determining multiple intervals and filtering noise in input signals.
Innovation Solution
A multi-interval sensing circuit with multiple thresholds and hysteresis levels, utilizing a comparison circuit and control circuit to adjust limit thresholds based on sampling frequency, allowing for interval determination and noise filtering across multiple intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional hysteresis sensing circuits with single threshold are used, then the circuit structure is simple, but the circuit cannot accurately determine multiple intervals and filter noise effectively
Solution Approach 1:
The patent divides the sensing circuit into multiple independent comparison units, each responsible for a specific interval range. Each comparison unit has its own threshold voltage generator and comparator, enabling parallel detection of multiple intervals. This segmentation allows the circuit to accurately determine which interval the input signal falls into while maintaining modular structure that simplifies analysis and design.
Solution Approach 2:
The patent transitions from single-threshold one-dimensional detection to multi-threshold multi-dimensional detection by introducing multiple threshold voltage levels. The threshold voltage generator produces several discrete threshold levels (Vth1, Vth2, ..., Vthn), and the comparators evaluate the input signal against these multiple levels simultaneously, adding dimensional complexity to the detection capability.
2Adaptability or versatility
If conventional hysteresis sensing circuits with fixed hysteresis voltage are used, then the circuit design is straightforward, but the threshold and hysteresis voltage cannot be flexibly adjusted
Solution Approach 1:
The patent implements dynamic threshold adjustment by making the threshold voltage generator controllable. The generator can dynamically switch between multiple threshold voltage levels based on control signals, allowing the sensing circuit to adapt to different measurement ranges and requirements. This dynamic capability enables flexible configuration of hysteresis voltage and threshold levels without requiring multiple fixed circuits.
Solution Approach 2:
The patent changes the threshold voltage parameter dynamically through the threshold voltage generator, which can output different voltage levels (Vth1, Vth2, ..., Vthn) based on control inputs. This parameter change capability allows the same hardware circuit to be reconfigured for different sensing ranges and hysteresis requirements, greatly enhancing versatility.
Data Source
AI summary
A sensing circuit includes: a comparison circuit for comparing an input signal to a corresponding limit threshold; and a control circuit for periodically selecting the limit threshold and sampling a comparison result to execute an interval determination step, thus determining an interval of the input signal. The interval determination step includes steps S100 and S200. Step S100: when the input signal is higher than an ascending upper limit threshold for consecutive plural times, assigning a higher adjacent interval as a following interval; when the input signal is lower than a descending lower limit threshold for consecutive plural times, assigning a lower adjacent interval as a following interval; and executing the interval determination step corresponding to the following interval. Step S200: When no adjacent interval is assigned as the following interval, generating an interval output signal corresponding to the interval and entering the corresponding step S100.