ESD Protection Component With Segmented N-Type Transistors
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Solution Overview
Problem
Dual direction Silicon Controlled Rectifiers (SCRs) in electrostatic discharge (ESD) protection devices have slow turn-on speeds, which impede the protection function, necessitating improvements to enhance the ESD protection function.
Innovation Solution
A protection component with N-type transistors, including a P-type substrate and two N-type transistors, where the on-off state is controlled by voltage levels at the control terminals, and an ESD protection device that uses a component controller to manage the N-type transistors' state for faster turn-on and prevention of current path formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a dual direction SCR is used in the ESD protection device, then the device can handle both positive and negative input signals, but the turn on speed is slow which affects the protection function
Solution Approach 1:
The patent divides the single SCR structure into two separate N-type transistors (first and second N-type transistors) with separate control mechanisms. Each transistor can be independently controlled to turn on or off, allowing the system to achieve fast response speeds while maintaining dual-direction protection capability through coordinated operation of the segmented components
Solution Approach 2:
The patent introduces dynamic control through control terminals that can adjust the conduction state of the N-type transistors in real-time. The component controller dynamically switches between different conduction states (first conduction state, second conduction state, and third conduction state) based on the direction and magnitude of the input signal, enabling fast response to ESD events while adapting to bidirectional signal requirements
2Speed
If the SCR is triggered quickly to improve protection response, then the turn on speed increases, but it may cause unwanted current path formation during normal operation
Solution Approach 1:
The patent implements feedback control through control terminals that monitor the input signal characteristics and adjust the conduction state of the N-type transistors accordingly. The component controller receives feedback about the signal direction and magnitude, and uses this information to precisely control which transistor conducts and when, ensuring fast response to ESD while preventing unwanted current paths during normal operation
Solution Approach 2:
The patent changes the control parameters of the N-type transistors (gate voltage, conduction state) based on the detected signal conditions. By adjusting these parameters dynamically, the system achieves fast turn-on response when ESD is detected while maintaining precise control to prevent spurious current paths during normal bidirectional signal operation
Data Source
AI summary
An electrostatic discharge protection device includes a protection component and a component controller. The protection component includes a first and a second P-type wells which are disposed in an N-type deep well, a first N-type transistor which is formed in the N-type deep well and the first P-type well, and a second N-type transistor which is formed in the N-type deep well and the second P-type well. When an electrostatic pulse occurs at a first pad or a second pad, the component controller turns on one of the first and the second N-type transistors to discharge the electrostatic pulse. When a first and a second operating signals are supplied to the first and the second pads, the component controller turns off the first and the second N-type transistors according to the first and the second operating signals so that the protection component is incapable of generating the current path.