Integrated Surge Protection Circuit for IC Signal I/O Pads
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Solution Overview
Problem
Traditional surge protecting devices cannot effectively protect integrated circuits (ICs) from surge voltages, as they are typically located outside the IC, occupying board space and increasing costs.
Innovation Solution
Incorporating a surge protecting device within or near the IC, comprising a first and second terminal coupled to output stage circuits and I/O pads, which processes surge voltages before they are handled by an ESD protecting device, allowing for compact integration and independent signal transmitting and receiving circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the surge protecting device is provided outside the IC on the board, then the IC can be protected from surge voltage, but the board space is occupied and the cost increases
Solution Approach 1:
The surge protecting device is merged with the IC by providing it within the IC chip structure itself, combining two previously separate components (IC and surge protector) into a single integrated unit. This eliminates the need for external surge protecting devices on the board, thereby reducing board space occupation while maintaining surge protection capability.
Solution Approach 2:
The surge protecting device is nested inside the IC chip structure, placing one functional component within another. The surge protecting device is embedded within the IC's internal architecture, allowing it to protect the IC from surge voltage while occupying minimal external space, thus resolving the contradiction between protection capability and board space occupation.
2Reliability
If the surge protecting device is provided outside the IC on the board, then the IC can be protected from surge voltage, but the cost increases
Solution Approach 1:
By merging the surge protecting device with the IC into a single integrated component, the manufacturing process is simplified. Instead of requiring separate procurement, placement, and connection of external surge protecting devices, the integrated design allows for single-chip fabrication, reducing assembly steps, material costs, and overall manufacturing complexity.
Solution Approach 2:
The nested structure of the surge protecting device within the IC enables a more efficient manufacturing process. The integrated design allows both components to be fabricated simultaneously in the same semiconductor manufacturing line, eliminating the need for separate component production and assembly, thereby reducing overall manufacturing cost.
3Reliability
If a traditional ESD protecting device is used, then ESD signals can be protected, but surge voltage damage cannot be prevented
Solution Approach 1:
The surge protecting device provided in the IC is designed to handle multiple types of voltage transients including both ESD signals and surge voltages. By implementing a universal protection mechanism that can respond to different types of electrical disturbances, the IC achieves comprehensive protection against both ESD and surge voltage damage, eliminating the need for separate protection devices for each threat type.
Data Source
AI summary
A signal transceiving circuit comprising an IC including a signal transmitting part. The signal transmitting part comprises: a first I/O pad; a second I/O pad; a first output stage circuit, coupled to the first I/O pad; a second output stage circuit, coupled to the second I/O pad; and a first surge protecting device, comprising a first terminal coupled to the first output stage circuit and the first I/O pad, and comprising a second terminal coupled to the second output stage circuit and the second I/O pad.