I/O Interface ESD Circuit for Low-Voltage MOS Gate Protection
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Solution Overview
Problem
The evolution of MOS transistor processes has reduced the withstand voltage of gate oxide layers, making it challenging to effectively manage electrostatic discharge (ESD) in input/output (I/O) interfaces, which can lead to damage to internal components.
Innovation Solution
The proposed I/O interface includes a gate component with a first switch component and an anti-electrostatic discharge apparatus, which increases the breakdown voltage at the first switch component, thereby enhancing its ability to withstand ESD. Additionally, a discharge bridge with a current resistance smaller than the first switch component allows static electricity to be safely discharged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrostatic discharge measures are used, then electrostatic discharge protection is provided, but the risk of damage to internal components increases
Solution Approach 1:
The gate component is segmented into a first switch component and a second switch component. The first switch component handles normal signal switching, while the second switch component specifically handles electrostatic discharge protection. This segmentation allows each component to be optimized for its specific function, improving overall reliability without compromising internal components.
Solution Approach 2:
The second switch component acts as an intermediary between the I/O terminal and the first switch component. When electrostatic discharge occurs, the second switch component activates to divert the discharge current away from the first switch component and internal components, thereby protecting the internal circuitry while maintaining I/O functionality.
2Productivity
If the withstand voltage of gate oxide layer is reduced for MOS component evolution, then device integration is improved, but electrostatic discharge protection capability deteriorates
Solution Approach 1:
The invention changes the voltage handling parameters by introducing a dual-switch architecture where the second switch component is specifically designed to handle high voltage electrostatic discharge events. This allows the first switch component to operate at lower voltages suitable for integrated MOS devices, while the second switch component provides the necessary high voltage protection capability.
3Measurement precision
If noise performance is improved by direct connection, then signal quality is enhanced, but electrostatic discharge protection is compromised
Solution Approach 1:
The second switch component dynamically switches between high-impedance and low-impedance states. During normal operation, it maintains high impedance to minimize noise and allow direct connection benefits. When electrostatic discharge is detected, it rapidly switches to low impedance to provide a discharge path, thus achieving both low noise performance and electrostatic discharge protection.
Data Source
AI summary
An input/output (I/O) interface is described. The I/O interface includes an I/O terminal, a gate component, and an anti-electrostatic discharge apparatus. The gate component controls reading of data from the I/O terminal. The gate component includes a first switch component, where an input end of the first switch component is connected to the I/O terminal. The anti-electrostatic discharge apparatus is configured to increase a breakdown voltage at the first switch component.