Electrostatic Protection Circuit Adjustment for IC Power Noise
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Solution Overview
Problem
Integrated circuit devices face malfunctions due to noise generated in the power supply lines during pulse driving, which can activate the electrostatic protection circuit unnecessarily, leading to increased power consumption and inappropriate activation waveforms.
Innovation Solution
An electrostatic protection circuit with an adjustment circuit that shortens the time constant period in response to control signals from the power supply generating circuit, preventing through currents and optimizing the operation of both the electrostatic protection and power supply generating circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrostatic protection circuit operates to suppress voltage rise, then the power supply voltage rise is suppressed, but the activation of the electrostatic protection circuit impedes the power supply voltage rise and causes malfunction
Solution Approach 1:
The patent applies dynamics by making the time constant period of the electrostatic protection circuit adjustable rather than fixed. The control circuit dynamically changes the time constant period based on the operating state of the power supply generating circuit, allowing the circuit to adapt between protecting during static events and enabling fast startup during normal operation.
Solution Approach 2:
The patent changes the parameter of the time constant period of the electrostatic protection circuit based on different operating conditions. By adjusting this parameter according to the power supply generating circuit's state, the system resolves the contradiction between protection reliability and startup speed.
2Use of energy by moving object
If the power supply generating circuit performs pulse driving to generate power supply voltage, then power consumption is reduced, but noise is generated in the power supply line which causes the electrostatic protection circuit to malfunction
Solution Approach 1:
The patent implements feedback by having the control circuit detect the operating state of the power supply generating circuit and use this information to adjust the time constant period of the electrostatic protection circuit. This feedback mechanism allows the system to respond to noise conditions and prevent malfunction while maintaining pulse driving for low power consumption.
Solution Approach 2:
The control circuit performs preliminary action by adjusting the time constant period of the electrostatic protection circuit in advance based on the operating state of the power supply generating circuit, preventing noise-induced malfunction before it occurs.
Data Source
AI summary
The integrated circuit device includes: an electrostatic protection circuit that is provided between first and second power supply lines coupled to external terminals respectively, and forms a current pathway between the first and second power supply lines during a given period in response to an increase in a voltage between the first and second power supply lines; and a power supply generating circuit that performs power supply control based on a voltage of the first power supply line and generates a control signal in accordance with a switching timing of the power supply control. And, the electrostatic protection circuit includes an adjustment circuit for shortening the given period in response to the control signal.