ESD Protection Circuit Using Feedback Active Load
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional electrostatic discharge protection circuits require increasing the area of capacitors to extend discharge time, which increases production costs and circuit size.
Innovation Solution
The electrostatic discharge protection circuit incorporates a discharge switch, a first transistor, an inverter, and a feedback circuit, where the feedback circuit extends the discharge time of the electrostatic discharge current by providing a turn-on path and acting as an active load, reducing the circuit's area and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the area of capacitor C1 is increased to extend discharge time, then the discharge time of electrostatic discharge current is extended, but the circuit area increases and production cost increases
Solution Approach 1:
The patent changes the operating parameters of the circuit by using the feedback circuit to dynamically adjust the discharge path and timing. Instead of relying on a large capacitor's physical properties, the feedback circuit modifies the electrical parameters (voltage levels, current paths, timing sequences) to achieve extended discharge time with smaller components.
Solution Approach 2:
The feedback circuit monitors the discharge process and provides control signals to extend the discharge time. By detecting the discharge state and responding with appropriate control actions, the feedback mechanism achieves time extension without requiring larger energy storage components, thereby reducing circuit area.
2Duration of action of moving object
If the area of capacitor C1 is increased to extend discharge time, then the discharge time of electrostatic discharge current is extended, but production cost increases
Solution Approach 1:
The patent achieves extended discharge time through parameter changes in the control circuit rather than through increased component sizes. This approach uses standard-value components operated at different parameters, which are more cost-effective and easier to manufacture than custom large-area capacitors.
Solution Approach 2:
The feedback circuit provides intelligent control that extends discharge time through active management rather than passive component scaling. This reduces production costs by avoiding the need for expensive large-area capacitors while achieving the same functional outcome through control logic.
3Device complexity
If a conventional electrostatic discharge protection circuit is used, then the circuit structure is simple, but the discharge time is limited and protection efficiency is reduced
Solution Approach 1:
The feedback circuit introduces intelligent control to the discharge process, monitoring discharge conditions and adjusting the discharge timing accordingly. This feedback mechanism enhances protection efficiency by ensuring the discharge switch remains on for the optimal duration, protecting against electrostatic discharge more effectively than simple conventional circuits.
Solution Approach 2:
The feedback circuit prepares and controls the discharge path in advance, ensuring that the discharge switch is activated at the precise moment needed and remains active for the required duration. This preliminary control action improves protection efficiency without requiring overly complex circuit structures.
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 extends the discharge time of the electrostatic discharge current, improving protection efficiency while reducing the circuit's layout area and production costs, with reduced leakage current in normal working mode.
Implementation Method 1
an electrostatic discharge protection circuit that can increase a discharge time of an electrostatic discharge current
Data Source
AI summary
An electrostatic discharge protection circuit, including a discharge switch, a first transistor, an inverter, and a feedback circuit, is provided. The discharge switch is coupled between a first power rail and a second power rail, and may be turned on or cut off according to a control voltage. The first transistor has a first end coupled to the first power rail. A control end of the first transistor receives the control voltage. The inverter is coupled between a second end of the first transistor and a control end of the discharge switch. The feedback circuit is coupled between an output end and an input end of the inverter and is configured to determine whether to provide a turn-on path between the input end of the inverter and the second power rail according to the control voltage.