Switch-Controlled ESD Array for Low-Area IC Protection
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Solution Overview
Problem
Integrated circuits (ICs) face challenges in protecting against electrostatic discharge (ESD) events due to high power dissipation and area constraints, leading to potential damage and inefficiencies in existing ESD protection networks, especially in deep sub-micron processes.
Innovation Solution
A semiconductor structure with an ESD protection network is implemented using a carrier wafer with patterned ESD protection circuits and circuit-controlled switches, which diverts damaging ESD pulses and reduces on-chip layout area by fabricating ESD protection circuits on the carrier wafer, allowing for programmable control of ESD protection devices to optimize robustness without inducing large parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional ESD protection networks are used, then ICs are protected from ESD events, but on-chip area consumption increases and power dissipation rises
Solution Approach 1:
The ESD protection network is divided into multiple individually controllable ESD protection devices (e.g., diodes, transistors) arranged in an array, where each device can be independently activated or deactivated through circuit-controlled switches based on specific ESD event conditions
Solution Approach 2:
The ESD protection network transitions from a static configuration to a dynamic one where circuit-controlled switches enable real-time activation/deactivation of individual ESD protection devices, allowing the system to adaptively adjust protection levels based on detected ESD event characteristics
2Reliability
If traditional ESD protection networks are used, then ICs are protected from ESD events, but power dissipation increases
Solution Approach 1:
Instead of activating the entire ESD protection network continuously or in full, the system activates only the specific number and type of ESD protection devices needed to handle the detected ESD event, avoiding unnecessary power consumption from over-protection
3Reliability
If more ESD protection devices are added to enhance protection, then ESD robustness improves, but parasitic capacitance increases
Solution Approach 1:
The system dynamically adjusts the number of active ESD protection devices based on the severity and characteristics of detected ESD events, activating additional devices only when necessary to maintain robustness while minimizing parasitic capacitance during normal operation
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
This solution effectively protects ICs from ESD events while minimizing area consumption and power dissipation, enhancing ESD robustness and reducing the risk of damage, thereby improving the reliability of ICs in deep sub-micron processes.
Implementation Method 1
the interface circuits can be exposed to a transient electrical event, or an electrical signal of a relatively short duration having rapidly changing voltage and power. Transient electrical events can include, for example, electrostatic discharge (ESD) events
Data Source
AI summary
An electrostatic discharge (ESD) protection apparatus and method for fabricating the same are disclosed herein. In some embodiments, the ESD protection apparatus comprises: an internal circuit formed in a first wafer; an array of electrostatic discharge (ESD) circuits formed in a second wafer, wherein the ESD circuits include a plurality of ESD protection devices each coupled to a corresponding switch and configured to protect the internal circuit from a transient ESD event; and a switch controller in the second wafer, wherein the switch controller is configured to control, based on a control signal from the first wafer, each of the plurality of ESD protection devices to be activated or deactivated by the corresponding switch, and wherein the first wafer is bonded to the second wafer.