ESD Protection Circuit for Low Gate-Source Voltage Transistors
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Solution Overview
Problem
The reduction in component size of semiconductor components due to advanced process technology has led to a decrease in electrostatic discharge (ESD) tolerance, making existing ESD protection circuits ineffective, and transistors with low gate-source withstand voltages risk being damaged by high supply voltages during normal operation.
Innovation Solution
An electrostatic discharge protection circuit comprising a detection circuit, P-type and N-type transistors, and a discharge circuit, which detects ESD events and provides a discharge path between power bonding pads to prevent component damage by controlling transistor states based on detection signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transistor components with low gate-source withstand voltages are used in the ESD protection circuit, then the circuit can operate with lower voltage stress on transistors, but the transistors may be burned due to excessive gate-source voltages when receiving high supply voltage under normal operation
Solution Approach 1:
The detection circuit detects the supply voltage level in advance before the ESD protection circuit activates. When high supply voltage is detected, the control circuit pre-adjusts the gate-source voltages of transistor components to safe levels, preventing excessive voltage damage before it occurs. This preliminary detection and adjustment resolves the contradiction by preparing the transistors for high-voltage conditions ahead of time.
Solution Approach 2:
The control circuit continuously monitors the supply voltage through the detection circuit and dynamically adjusts the gate-source voltages of transistor components based on the detected voltage level. When high supply voltage is detected, the control circuit provides feedback to reduce gate-source voltages to safe levels, and when normal voltage is detected, it restores the voltages to enable effective ESD protection. This closed-loop feedback mechanism resolves the contradiction by adapting transistor voltages to current operating conditions.
2Productivity
If component size is reduced to improve integrated circuit performance and computing speed, then the performance and computing speed improve, but the ESD tolerance of components decreases significantly
Solution Approach 1:
The ESD protection circuit applies different protection strategies to different parts of the circuit based on local conditions. The detection circuit monitors supply voltage locally, and the control circuit adjusts gate-source voltages locally for transistor components based on the detected conditions. This localized adaptation allows small transistors to withstand ESD events by providing targeted voltage control where needed, resolving the contradiction between small component size and ESD tolerance.
Solution Approach 2:
The control circuit dynamically changes the gate-source voltage parameters of transistor components based on detected supply voltage levels. When high supply voltage is detected, the control circuit reduces gate-source voltages to safe levels, and when normal voltage is detected, it restores voltages to enable ESD protection. This dynamic parameter adjustment allows small transistors to operate safely under high-voltage conditions while maintaining ESD protection capability, resolving the contradiction between component size reduction and ESD tolerance.
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 circuit effectively manages electrostatic discharge by preventing transistor burnout and maintaining low gate-source voltages, ensuring the protection of semiconductor components from ESD events.
Implementation Method 1
In response the electrostatic discharge event occurring on the first power bonding pad, the discharge circuit provides a discharge path between the first power bonding pad and the second power bonding pad according to the first control signal
Data Source
AI summary
An ESD includes a detection circuit, a P-type transistor, a N-type transistor, and a discharge circuit. The detection circuit detects whether an electrostatic discharge event occurs on a first power bonding pad to generate first and second detection signals. The first P-type transistor is coupled between the first power bonding pad and a first node and receives the first detection signal. The first N-type transistor is coupled between the first node and a second power bonding pad and receives the second detection signal. The discharge circuit is coupled between the first power bonding pad and the second power bonding pad and controlled by a control signal on the first node. In response the electrostatic discharge event occurring on the first power bonding pad, the discharge circuit provides a discharge path between the first power bonding pad and the second power bonding pad according to the control signal.