Cross-Level Signal Gateway Circuit Without Feedback Locking
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Solution Overview
Problem
Existing cross-level digital signal transmission systems face issues with bi-directional symmetrical transmission between digital systems with different ground levels, requiring additional control signals and resulting in signal errors due to positive feedback loops.
Innovation Solution
A cross-level digital signal transmission device comprising first and second gateway devices with signal control terminals that form a closed loop, using the transmission signal itself to prevent positive feedback, eliminating the need for additional control signals and maintaining symmetry in transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional control signals are added to manage cross-level transmission, then transmission reliability is improved, but device complexity increases
Solution Approach 1:
The transmission signal itself is used to control the gate devices, making the system self-regulating without external control signals. The signal automatically prevents positive feedback by controlling the gate devices through its own voltage levels, eliminating the need for additional control circuitry while maintaining transmission reliability
Solution Approach 2:
The control function is extracted from separate control signals and integrated into the transmission signal itself. The gate control is derived directly from the transmission signal's voltage levels, removing the need for dedicated control lines and reducing overall system complexity while maintaining reliable bidirectional transmission
2Reliability
If additional control signals are added to manage cross-level transmission, then signal locking is prevented, but ease of operation deteriorates
Solution Approach 1:
The transmission signal automatically controls the gate devices to prevent signal locking. When a signal is transmitted at high voltage level, it automatically turns off the opposite direction's gate device, preventing feedback and locking without requiring external control signals, thus maintaining both accuracy and simplicity
3Device complexity
If ground level difference is not compensated, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
Gate devices are introduced as intermediaries between the two digital systems with different ground levels. These gate devices convert the transmission signal levels and isolate the ground level differences, allowing accurate logic level detection without requiring complex ground level matching circuits
Solution Approach 2:
The voltage levels of the transmission signal are changed by the gate devices to match the logic level requirements of the receiving system. The gate devices transform the voltage parameters according to the ground level differences, ensuring accurate signal interpretation while maintaining simple circuit structure
Data Source
AI summary
A cross-level digital signal transmission device between two systems for cross-level digital signal transmission. Bi-directional symmetrical transmission is achieved without using additional control signals, and use of the transmission signal itself eliminates the positive feedback loop. Thus, neither additional control signals nor resulting unsymmetrical circuits need be provided.