Digital Signal Input Circuit With Comparator-Based Level Conversion
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Solution Overview
Problem
Existing digital signal level conversion circuits suffer from low precision in determining signal levels, leading to conversion errors due to the use of light emitting diodes, which limits their effectiveness in interconnecting different IC chips.
Innovation Solution
A digital signal input circuit incorporating a voltage determining circuit with a voltage comparator and a switching device to control an isolating circuit, allowing for precise level conversion by determining the state of the isolating circuit based on the digital signal level, thereby enhancing the accuracy of level conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a light emitting diode is used to determine the level of the digital signal, then the circuit structure is simple, but the precision of determining the signal level is low and conversion errors easily occur
Solution Approach 1:
The patent changes the determination mechanism from a light emitting diode's binary on/off state to a voltage comparator's continuous voltage comparison. The voltage comparator compares the digital signal voltage with a reference voltage to accurately determine signal levels, transforming the parameter basis from optical threshold detection to electrical voltage comparison, thereby significantly improving measurement precision.
Solution Approach 2:
The patent replaces the light emitting diode's optical detection mechanism with an electrical voltage comparison mechanism. Instead of using optical energy conversion and threshold-based detection, the system uses direct electrical voltage comparison between the digital signal and reference voltage, eliminating the precision limitations of optical detection.
2Reliability
If a voltage comparator is introduced to accurately control the isolating circuit, then the correctness of digital signal level conversion is improved, but the device complexity increases
Solution Approach 1:
The patent introduces a voltage comparator as an intermediary component between the digital signal and the isolating circuit. The voltage comparator acts as a mediator that compares the signal voltage with a reference voltage and generates a control signal to drive the isolating circuit, ensuring accurate level conversion while maintaining clear functional separation between components.
Solution Approach 2:
The patent segments the level conversion function into distinct components: voltage division circuitry for signal conditioning, voltage comparator for level determination, and isolating circuit for level conversion. This segmentation allows each component to perform its specific function with high precision, improving overall reliability despite increased component count.
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 proposed solution increases the correctness of digital signal level conversion by utilizing a voltage comparator to accurately control the isolating circuit, supporting a larger digital signal level range and ensuring compatibility with target chips.
Implementation Method 1
A light emitting diode 120 in the isolating circuit determines whether a level of the digital signal is a high level or a low level
Implementation Method 2
A digital signal input circuit incorporating a voltage determining circuit with a voltage comparator and a switching device to control an isolating circuit, allowing for precise level conversion by determining the state of the isolating circuit based on the digital signal level
Data Source
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AI summary
Embodiments of the present invention disclose a digital signal input circuit. The circuit includes an isolating circuit and a voltage determining circuit, where a first port of an input end of the isolating circuit is connected to an input end of a digital signal, an output end of the isolating circuit is connected to an output end of the digital signal, and when the isolating circuit is open, the isolating circuit is configured to output a first level, or when the isolating circuit is closed, the isolating circuit is configured to output a second level; and an input end of the voltage determining circuit is connected to the input end of the digital signal, an output end of the voltage determining circuit is connected to a second port of the input end of the isolating circuit, and the voltage determining circuit is configured to determine, according to a level of the digital signal, whether the isolating circuit is open or closed. According to the digital signal input circuit, the voltage determining circuit determines a level of a digital signal, so as to avoid determining of a level of a digital signal by means of a light emitting diode in the prior art. In this way, correctness of digital signal level conversion is increased.