MOSFET Gate Stress Test Circuit Without Resistor Power Loss
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Solution Overview
Problem
Conventional gate stress testing methods for transistors require resistors that need careful sizing to minimize static power dissipation and result in increased area and dynamic power loss, compromising the efficiency and performance of the driving stage.
Innovation Solution
A gate stress testing circuit that eliminates the need for resistors by using additional switches and transistors, minimizing static power loss and reducing the circuit footprint while maintaining efficient dynamic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resistors are used in gate stress testing circuit, then the circuit can limit current and protect components, but static power dissipation increases and circuit area expands
Solution Approach 1:
The patent removes resistors from the gate stress testing circuit and replaces them with switch-based protection mechanisms. The resistors that previously provided current limiting and component protection are extracted and replaced by controlled switching elements that achieve the same protective function without continuous power dissipation.
Solution Approach 2:
The circuit uses the transistor under test and additional switching elements to automatically limit current and protect components during stress testing. The protection mechanism is self-regulating through the switching action, eliminating the need for external resistive protection elements that continuously dissipate power.
2Reliability
If resistors are used in gate stress testing circuit, then current limiting is achieved, but circuit area increases
Solution Approach 1:
The patent extracts resistors from the circuit and replaces them with switch-based current limiting mechanisms. The physical space previously occupied by resistive elements is eliminated, reducing overall circuit footprint while maintaining current limiting functionality through controlled switching.
Solution Approach 2:
The patent replaces the passive resistive current limiting mechanism with an active switching-based control system. This substitution uses electronic switching elements instead of physical resistive components, achieving the same current limiting effect with reduced area occupation.
3Reliability
If resistors are used in gate stress testing circuit, then protection is provided, but dynamic power loss increases
Solution Approach 1:
The patent removes resistors that caused dynamic power loss and replaces them with switch-based protection. The switching elements provide component protection only when needed during stress testing, eliminating continuous dynamic power dissipation associated with resistive protection elements.
Solution Approach 2:
The protection mechanism operates periodically through controlled switching action rather than continuously through resistive elements. The switches are activated only when protection is needed during stress testing events, reducing dynamic power loss compared to continuous resistive protection.
Data Source
AI summary
According to an embodiment, a circuit for transistor gate stress testing is proposed. The circuit includes a first p-channel MOSFET with its drain linked to the transistor's gate; a second p-channel MOSFET coupling its source to the first p-channel MOSFET's source at a node and its drain to a supply voltage; a first n-channel MOSFET with its source to ground and drain to the transistor's gate; a second n-channel MOSFET with its source to ground and drain to the second p-channel MOSFET's gate; a third p-channel MOSFET with its source and drain bridging the node to the second n-channel MOSFET's drain; a fourth p-channel MOSFET in trans-diode setup, its gate to the third p-channel MOSFET's gate and source to the supply rail; plus a current source placed between the fourth p-channel MOSFET's drain and ground.