Failsafe Node Voltage Circuit for Leakage Current Prevention
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Solution Overview
Problem
Circuits face operational failures when the supply voltage drops to ground voltage or zero voltage, leading to potential leakage currents due to improper control of failsafe modes.
Innovation Solution
A voltage setting circuit that sets the failsafe node voltage to the higher of the supply voltage and pad node voltage, ensuring the output transistor remains non-conductive and prevents leakage currents during failsafe operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the failsafe node voltage is set to a voltage less than the supply voltage during failsafe mode, then the circuit can respond to supply voltage drops, but leakage current occurs due to voltage mismatch with the pad node
Solution Approach 1:
The voltage setting circuit dynamically adjusts the failsafe node voltage based on real-time comparison between supply voltage and pad node voltage. During failsafe mode, the circuit monitors both voltage levels and automatically sets the failsafe node voltage to the higher of the two voltages, ensuring adaptive response to varying voltage conditions while preventing leakage current
Solution Approach 2:
The voltage setting circuit acts as an intermediary between the supply voltage and the failsafe node. It introduces a control mechanism that compares supply voltage with pad node voltage and mediates the voltage level applied to the failsafe node, ensuring the failsafe node receives the appropriate voltage (the higher of the two) without directly connecting the failsafe node to either voltage source
2Object-generated harmful factors
If the failsafe node voltage is set to match the pad node voltage during supply voltage drops, then leakage current is prevented, but the circuit complexity increases due to additional voltage comparison and control mechanisms
Solution Approach 1:
The voltage setting circuit changes the voltage parameter of the failsafe node based on the comparison between supply voltage and pad node voltage. By monitoring voltage levels and adjusting the failsafe node voltage to match the higher voltage level, the circuit dynamically modifies its operating parameters to prevent leakage current while maintaining manageable complexity through standardized voltage control techniques
Data Source
AI summary
Provided is a circuit that sets a voltage of a failsafe node. The circuit includes a first voltage setting transistor configured to operate in a conductive state to set a voltage of the failsafe node to a supply voltage of a supply voltage node. The circuit includes first and second control transistors configured to control the first voltage setting transistor to operate in the conductive state in response to both the supply voltage and a pad node voltage of a pad node corresponding to logical one and control the first voltage setting transistor to operate in a nonconductive state in response to one of the supply voltage or the pad node voltage corresponding to the logical one and another one of the supply voltage or the pad node voltage corresponding to logical zero.