Power-On Detector Voltage Slope Analysis
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Solution Overview
Problem
Conventional power-on detectors inaccurately determine the stability of externally applied power supply voltage, leading to premature stabilization judgments due to voltage ripples and abnormal operations, which can result in errors during power-on operations in memory devices.
Innovation Solution
A power-on detector that calculates the slope of the rising power supply voltage and waits for a calculated time to ensure stabilization at a target voltage level, generating a control signal only when the voltage is reliably stable, thereby preventing premature reset or read operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a conventional power-on detector judges voltage stability based on reaching a first predetermined voltage, then the detection speed is improved, but the reliability of voltage stability judgment deteriorates due to premature judgment from voltage ripples and abnormal operations
Solution Approach 1:
The patent applies preliminary action by performing multiple voltage threshold checks (first predetermined voltage, second predetermined voltage, and target voltage level) before finalizing the power-on detection. Instead of immediately judging stability when reaching the first voltage threshold, the system continues to monitor subsequent voltage levels and only confirms stability after the voltage remains above the target level for a calculated duration, preventing premature judgment due to voltage ripples or abnormal operations.
Solution Approach 2:
The patent implements feedback by continuously monitoring the power supply voltage after it reaches the first predetermined voltage level. The system uses voltage detectors to track whether the voltage remains stable above subsequent thresholds (second predetermined voltage and target voltage level) and adjusts the detection outcome based on this continuous feedback. The calculated time duration based on voltage slope provides additional feedback to confirm genuine stabilization before triggering the power-on detection signal.
2Reliability
If the power-on detector waits for complete voltage stabilization, then the reliability of operation is improved, but the power-on detection time increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the detection criteria based on the voltage slope calculation. Instead of using a fixed waiting time or single voltage threshold, the system calculates the rate of voltage rise and uses this parameter to determine an optimized waiting duration. This allows the detector to adapt to different voltage stabilization scenarios, confirming stability more quickly when voltage rises steadily while maintaining reliability even when stabilization takes longer.
Data Source
AI summary
A power-on detector supplied with a power supply voltage from an external source and detects a variation of the power supply voltage. The operating method of the power-on detector comprises calculating the slope of the rise of power supply voltage from a first voltage to a second voltage higher than the first voltage; and calculating the expected time for the power supply voltage to reach a target voltage level, based on the calculated slope.