Power-Up Signal Circuit for Dual Voltage Stabilization
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Solution Overview
Problem
Conventional power up circuits generate a power up signal only after detecting a stable external power voltage, leading to instability and reliability issues due to slow recovery of internal power voltage during external power voltage fluctuations.
Innovation Solution
A circuit design that generates a power up signal after both external and internal power voltages reach predetermined levels, using an external power voltage divider, detector, and power up signal generator, ensuring stable operation by considering the level states of both voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power up signal is generated only after detecting stable external power voltage, then the external power detection is simple and fast, but the internal power voltage stability is compromised leading to reliability issues
Solution Approach 1:
The power detection function is segmented into two independent detection paths: one for external power voltage and another for internal power voltage. Each path has its own detector circuit that independently monitors its respective voltage source. This segmentation allows simultaneous detection of both power sources without requiring a single complex detection mechanism, thereby improving reliability while managing circuit complexity.
Solution Approach 2:
The power up signal generator acts as an intermediary that receives detection signals from both external and internal power detectors. It integrates these two detection results and generates the final power up signal only when both conditions are satisfied. This intermediary component coordinates the dual detection mechanism, ensuring that the power up signal reflects the stability of both power sources.
2Reliability
If the power up signal is generated after both external and internal power voltages are stabilized, then the reliability is improved, but the detection time is extended
Solution Approach 1:
The internal power voltage detector begins monitoring the internal power voltage immediately after power application, performing preliminary detection in parallel with external power detection. This preliminary action allows the system to prepare the internal detection result without waiting for external power to stabilize first, reducing the overall time loss while ensuring both power sources are verified.
Solution Approach 2:
The dual detection mechanism operates continuously and simultaneously for both external and internal power voltages throughout the power-up process. Both detectors work in parallel without interruption, continuously monitoring their respective voltages until both stabilization conditions are met. This continuous parallel operation minimizes idle time and reduces the total power-up time compared to sequential detection methods.
Data Source
AI summary
There is provided a circuit and a method for generating a power up signal. The circuit for generating a power up signal, includes an external power voltage divider for dividing a magnitude of an external power voltage so as to output the divided voltage, an external power voltage detector for activating a detection signal when the output voltage of the external power voltage divider reaches a preset level, and a power up signal generator for outputting a power up signal according to the detection signal and a first internal power voltage. Herein, the power up signal is generated when the internal power voltage as well as the external power voltage reaches a sufficient level so that a power up signal skew may be reduced to stabilize its operation and enhance reliability of a device.