Transistor-Only ESD Clamp Circuit for Voltage Peak Suppression
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Solution Overview
Problem
Existing electrostatic discharge protection devices are inadequate for modern electronic devices with smaller components, requiring higher performance and easier implementation to ensure reliability and durability.
Innovation Solution
An electrostatic discharge protection device comprising only transistors, specifically a clamping circuit with MOS-type and BiMOS-type transistors, diode-effect components, and a coupling circuit, which attenuates or suppresses voltage peaks without using traditional diodes, and enables coupling with other protection devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional electrostatic discharge protection devices are used, then protection functionality is provided, but device complexity and difficulty of implementation increase
Solution Approach 1:
The patent merges multiple protection functions (clamping, triggering, diode effects) into a single integrated transistor-based circuit. The clamping circuit, trigger module, and diode effect components are combined in one structure, eliminating the need for separate discrete components and reducing overall device complexity while maintaining protection reliability.
Solution Approach 2:
The transistor-based circuit performs multiple functions simultaneously: the clamping circuit attenuates voltage peaks, the trigger module detects electrostatic discharge events, and the diode effect components provide unidirectional current control. This multi-functionality in a single integrated structure reduces device complexity compared to using separate dedicated components for each function.
2Volume of moving object
If component sizes are reduced, then electronic devices become more compact, but electrostatic discharge protection becomes more difficult to implement
Solution Approach 1:
By integrating all protection functions into a single transistor-based circuit structure, the patent achieves compact size suitable for modern small electronic devices. The merged structure eliminates the need for multiple discrete components that would be difficult to implement in compact configurations, making protection easier to manufacture in small-form-factor devices.
3Reliability
If voltage peak attenuation is increased, then electrostatic discharge protection is improved, but device complexity increases
Solution Approach 1:
The patent achieves voltage peak attenuation by changing the electrical parameters of the transistor-based clamping circuit. By adjusting transistor characteristics (threshold voltages, conduction properties) rather than adding complex circuit structures, the circuit achieves effective voltage suppression while maintaining simplicity. The trigger module parameters are optimized to activate at appropriate voltage levels without requiring additional complex detection circuitry.
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 transistor-based device effectively protects electronic devices from electrostatic discharges by attenuating voltage peaks, ensuring reliability and durability, and can be easily integrated into electronic circuits.
Implementation Method 1
electrostatic discharge protection device comprising only transistors... effectively attenuates or suppresses voltage peaks caused by electrostatic discharges
Data Source
AI summary
An electrostatic discharge protection device is formed using only electrically connected transistors. The transistors include: a first MOS-type transistor forming a clamping circuit coupled between first and second supply nodes; a second MOS-type transistor coupled between the first supply node and a gate terminal of the first MOS-type transistor; and a third MOS-type transistor having a first gate terminal coupled to a gate terminal of the second MOS-type transistor, a second gate terminal coupled to one of the first and second supply nodes, and first and second conduction terminals coupled to the second supply node.