Digital Power-On Detection Circuit Using Flip-Flop and Comparator
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Solution Overview
Problem
Existing power-on detection circuits require analog circuits, which are process-dependent, costly, and occupy significant space, making them inefficient and costly to develop as semiconductor technology advances.
Innovation Solution
A digital power-on detection circuit utilizing a flip-flop circuit to store data and a comparator to output a power-on detect flag based on comparison with a fixed value, reducing dependency on semiconductor process rules and simplifying circuit design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an analog circuit (time constant circuit and voltage detection circuit) is used to detect power-on, then power-on detection function is achieved, but circuit size becomes large and development cost increases
Solution Approach 1:
The patent replaces the analog circuit system with a digital circuit system. Specifically, it substitutes the time constant circuit and voltage detection circuit with a flip-flop circuit and comparator that operate in the digital domain. This substitution dramatically reduces circuit size while maintaining the power-on detection function, as digital circuits are more compact and process-compatible than their analog counterparts.
Solution Approach 2:
The patent changes the operating parameters from analog voltage levels to digital logic levels. By detecting power-on through digital signal transitions (0 to 1) rather than analog voltage threshold detection, the circuit achieves the same functional goal with significantly reduced component count and smaller footprint, directly addressing the circuit size issue.
2Reliability
If an analog circuit is used to detect power-on, then power-on detection function is achieved, but circuit complexity increases and process adaptability decreases
Solution Approach 1:
The patent replaces the complex analog circuit system with a simpler digital circuit system. The time constant circuit and voltage detection circuit are substituted with a flip-flop circuit and comparator that operate in the digital domain. This substitution reduces circuit complexity while maintaining the power-on detection function, as digital circuits are more straightforward to design and less sensitive to process variations.
3Reliability
If an analog circuit is used to detect power-on, then power-on detection function is achieved, but development time and cost increase
Solution Approach 1:
The patent changes the operating parameters from analog to digital, which fundamentally simplifies the development process. Digital circuits are more compatible with standard semiconductor fabrication processes, reducing the need for process-specific customization. This parameter change leads to shorter development cycles and lower costs, as digital design methodologies are more mature and transferable across different process nodes.
Data Source
AI summary
There is provided a power-on detection circuit including: a flip-flop circuit storing an indefinite value at the time of power-on and outputting plural-bit data; and a comparator comparing the plural-bit data output from the flip-flop circuit and a plural-bit fixed value and outputting a power-on detect flag depending on a comparison result thereof.