ESD Protection Circuit with Fuse Controller for 3D-IC Signal Delay
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Solution Overview
Problem
Existing ESD protection circuits in 3D-ICs introduce signal propagation delay due to intrinsic stray capacitance and resistance, particularly when the number of TSVs exceeds the number of I/O pins, leading to potential damage from electrostatic discharge.
Innovation Solution
A protection circuit with a discharge passage including an electric fuse and a controller that performs electrostatic discharge and blows out the fuse after discharge, disconnecting the passage to prevent stray capacitance and resistance, thereby reducing signal propagation delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an ESD protection circuit is configured for each TSV, then electrostatic discharge is prevented and transistors are protected from damage, but signal propagation delay increases due to intrinsic stray capacitance and resistance
Solution Approach 1:
The patent extracts and removes the discharge passage from the circuit after ESD protection is achieved by blowing out the electric fuse. This eliminates the stray capacitance and resistance of the discharge passage after it has fulfilled its protective function, thereby resolving the contradiction between maintaining reliability during ESD events and reducing signal propagation delay during normal operation.
Solution Approach 2:
The patent discards the discharge passage after use by blowing out the electric fuse, which permanently disconnects the protective circuit. This allows the circuit to recover its normal signal transmission performance by removing the harmful stray capacitance and resistance that would otherwise persist during normal operation.
2Loss of time
If a discharge passage with electric fuse is used, then signal propagation delay is reduced after discharge, but the circuit complexity increases due to the controller and fuse mechanism
Solution Approach 1:
The controller automatically detects when ESD protection is complete and triggers the fuse blowing mechanism without requiring external intervention. This self-service approach simplifies the overall system control while achieving the goal of removing the discharge passage after use, thereby reducing signal propagation delay without requiring complex external control systems.
3Reliability
If the number of TSVs exceeds the number of I/O pins, then more discharge passages are needed for protection, but the stray capacitance and resistance increase, leading to greater signal propagation delay
Solution Approach 1:
The patent extracts and removes discharge passages after they have provided necessary protection coverage. By blowing out fuses in discharge passages that are no longer needed for protection, the system maintains adequate protection coverage while eliminating the cumulative stray capacitance and resistance that would otherwise increase signal propagation delay.
Solution Approach 2:
The patent applies different states to different discharge passages - some remain active where protection is still needed, while others are disconnected where protection is no longer required. This local differentiation allows the system to maintain protection coverage in critical areas while reducing overall stray capacitance and signal propagation delay in non-critical areas.
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 effectively prevents damage from electrostatic discharge and reduces signal propagation delay by cutting off the connection after discharge, improving the reliability of 3D-ICs with a higher number of TSVs.
Implementation Method 1
the charges in the top die are released to the bottom die via the TSVs, thereby generating electro-static discharge (ESD)
Implementation Method 2
the electrostatic charges stored in the first wafer may be released to the low voltage line VSS via the ESD protection circuit
Implementation Method 3
the controller is configured to blow out the electric fuse after the discharge passage fulfills electro-static discharge
Data Source
AI summary
Protection circuit and integrated circuit are provided. A protection circuit includes a discharge passage, configured to perform an electro-static discharge and a controller configured to blow out the electric fuse after the discharge passage fulfills electro-static discharge. The discharge passage includes an electric fuse.