ESD Protection Circuit Using Resistor-Transistor Trigger
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Solution Overview
Problem
Conventional electrostatic discharge protection circuits require complex trigger circuits that occupy extra layout area, making it challenging to improve conduction efficiency of electrostatic discharge transistors within limited layout regions.
Innovation Solution
An electrostatic discharge protection circuit comprising a first resistor, a first transistor, a second resistor, and a second transistor, where the first resistor delays the conduction of the first transistor and the second resistor facilitates the dissipation of electrostatic discharge current, allowing the second transistor to be effectively conducted, thereby enhancing protection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a complicated trigger circuit is disposed to improve conduction efficiency of the electrostatic discharge transistor, then the conduction efficiency is improved, but the circuit area increases
Solution Approach 1:
The patent extracts and eliminates the complicated trigger circuit from the conventional ESD protection design. Instead of using a complex trigger mechanism, the invention directly employs the electrostatic discharge transistor with simplified control, removing unnecessary circuit components while maintaining effective ESD protection functionality.
Solution Approach 2:
The electrostatic discharge transistor is designed to automatically respond to electrostatic discharge events without requiring an external trigger circuit. The transistor's control end is directly coupled to detect voltage changes on the power rail, enabling self-activation when ESD occurs, thus eliminating the need for separate trigger circuitry.
2Speed
If a complicated trigger circuit is disposed to respond to electrostatic discharge phenomenon, then the response capability is improved, but the layout area increases
Solution Approach 1:
The patent removes the trigger circuit from the ESD protection architecture, extracting only the essential electrostatic discharge transistor that can directly respond to voltage transients on the power rail without requiring additional trigger logic or control circuitry.
Solution Approach 2:
The electrostatic discharge transistor is configured to automatically detect and respond to electrostatic discharge events through direct coupling of its control end to the power rail, enabling self-service operation without external triggering mechanisms.
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 proposed circuit significantly improves conduction efficiency and protection against electrostatic discharge while minimizing layout area by using a trigger circuit with one transistor and two resistors, ensuring effective dissipation of electrostatic discharge currents.
Implementation Method 1
The first resistor has a first end coupled to a first power rail, and a second end coupled to a control end of the first transistor... conducts the first transistor through a delay effect of the first resistor
Implementation Method 2
provide a dissipating path for an electrostatic discharge current and prevent circuit elements from being damaged
Implementation Method 3
a second end of the second transistor is coupled to the second power rail... conducts the second transistor through an electrostatic discharge current dissipated by the first transistor
Data Source
AI summary
Provided is an electrostatic discharge protection circuit, including a first resistor, a first transistor, a second resistor, and a second transistor. The first resistor has a first end coupled to a first power rail. The first transistor has a first end coupled to the first power rail, and a control end of the first transistor is coupled to a second end of the first resistor. The second resistor is coupled between a second end of the first transistor and a second power rail. The second transistor has a first end coupled to the first power rail, a control end of the second transistor is coupled to the second end of the first transistor, and a second end of the second transistor is coupled to the second power rail.