Semiconductor ESD Protection via Through Conductor and VDMOS
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Solution Overview
Problem
Semiconductor devices have limited tolerance to electrostatic discharge (ESD), which can damage internal circuits and reduce their reliability.
Innovation Solution
A semiconductor device is designed with an N-type substrate, a through conductor penetrating the substrate, and an ESD protection circuit connected to a protection target circuit via the through conductor, utilizing a clamper and VDMOS transistor to absorb ESD surges and protect internal circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ESD protection circuits are used, then basic protection is provided, but the tolerance to ESD is limited and internal circuits can be damaged
Solution Approach 1:
The ESD protection function is divided into multiple independent components: the through conductor provides a dedicated ESD current path, the clamp circuit limits voltage, and the VDMOS transistor handles high-current discharge. This segmentation allows each component to be optimized for its specific function, significantly improving overall ESD tolerance compared to conventional integrated protection circuits.
Solution Approach 2:
The through conductor acts as an intermediary element that penetrates the substrate and provides a low-impedance path for ESD current to flow from the input terminal to ground. This mediator separates the ESD protection path from the normal signal path, allowing ESD currents to be shunted away from sensitive internal circuits without affecting normal operation.
2Reliability
If the ESD protection circuit is integrated on the substrate, then protection is provided, but the complexity of the device increases
Solution Approach 1:
The VDMOS transistor serves multiple functions: it acts as a switch for ESD current discharge, provides voltage clamping through its breakdown characteristics, and maintains low on-resistance during normal operation. The through conductor simultaneously provides both mechanical support and an electrical pathway for ESD current. This multi-functionality reduces the need for additional dedicated components, thereby limiting complexity increase.
3Reliability
If a through conductor is used to connect ESD protection circuit and protection target circuit, then ESD tolerance is increased, but the manufacturing precision requirements increase
Solution Approach 1:
The through conductor extends in the vertical dimension (through the substrate thickness) rather than relying solely on planar connections. This three-dimensional approach provides additional connection points and redundancy, reducing the impact of lateral misalignment. The vertical penetration allows connections to be made at different levels of the substrate, accommodating manufacturing tolerances more effectively.
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 solution significantly increases the semiconductor device's tolerance to ESD, effectively protecting internal circuits from damage and enhancing reliability by absorbing ESD surges through the ESD protection circuit.
Implementation Method 1
ESD protection circuits are used to protect the internal circuits of semiconductor devices from ESD due to extraneous electrostatic charge
Data Source
AI summary
A semiconductor device has an N-type substrate, a through conductor penetrating the N-type substrate, a protection target circuit provided on the N-type substrate, and an ESD protection circuit provided on the N-type substrate. The protection target circuit and the ESD protection circuit are connected together to the through conductor.