ESD Protection Circuit with Voltage-Dividing Node
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Solution Overview
Problem
Conventional electrostatic discharge (ESD) protection circuits in integrated circuits have limited voltage handling capability, making them inadequate for high voltage conditions and unable to protect internal circuitry from electrostatic shocks effectively.
Innovation Solution
An ESD protection circuit design that includes a voltage-dividing output node between power supply terminals, detection units to sense electrostatic signals, and a control unit to generate discharge control signals for clamping transistors, allowing for the effective discharge of electrostatic current and enhancing voltage handling capacity by dividing both power supply and electrostatic discharge voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ESD protection circuit components are used, then the circuit can provide basic electrostatic discharge protection, but the voltage handling capability is limited and cannot operate under high voltage conditions
Solution Approach 1:
The ESD protection circuit is divided into multiple independent functional modules: detection unit, control unit, and clamping unit. Each module operates independently with specific voltage handling requirements, allowing the overall circuit to accommodate higher voltages through modular configuration rather than requiring all components to withstand the full voltage simultaneously.
Solution Approach 2:
A voltage-dividing output node is introduced as an intermediary between the power supply terminals. This node divides both the power supply voltage and the electrostatic discharge voltage, enabling components to operate at lower voltage levels while the overall circuit handles high voltages. The voltage-dividing node acts as a mediator that translates high voltage conditions into manageable voltage levels for individual components.
2Device complexity
If the ESD protection circuit uses a single detection unit and simple control logic, then the device complexity is low, but it cannot effectively detect and respond to electrostatic signals under high voltage conditions
Solution Approach 1:
The detection function is segmented into a dedicated detection unit that is separate from the control unit. This detection unit specifically monitors voltage conditions and generates detection signals, while the control unit processes these signals and generates appropriate control signals. This segmentation allows the detection unit to be optimized for signal detection without increasing overall circuit complexity.
Solution Approach 2:
The control unit receives detection signals from the detection unit and generates control signals for the clamping unit based on this feedback. This feedback mechanism ensures that the ESD protection circuit responds dynamically to detected electrostatic conditions, improving reliability without requiring complex predetermined control logic.
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 solution increases the voltage handling capability of the ESD protection circuit, enabling it to operate under high voltage conditions and effectively prevent damage from electrostatic discharges by dividing the electrostatic discharge voltage and using multiple clamping transistors to manage the discharge process.
Implementation Method 1
A voltage-dividing output node is defined between the first and the second power supply terminals
Implementation Method 2
the clamping unit is configured to receive the first discharge control signal and the second discharge control signal to discharge an electrostatic current between the first and the second power supply terminals
Data Source
AI summary
The present disclosure provides an electrostatic discharge (ESD) protection circuit and configuration method thereof. The ESD protection circuit includes first and second power supply terminals, first and second detection units, a control unit, a clamping unit, and a voltage-dividing output node defined between the first and second power supply terminals. The first detection unit detects an electrostatic signal, based on a signal between the first power supply terminal and the voltage-dividing output node, and outputs a first signal. Likewise, the second detection unit outputs a second signal. The control unit is configured to be driven by the first signal to convert into a first discharge control signal and by the second signal to convert into a second discharge control signal. The clamping unit is configured to receive the first and second discharge control signals to discharge an electrostatic current between the first and the second power supply terminals.