Analog Power-Up Reset Circuit for Stable Logic State Initialization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing reset circuits for electrical components fail to stabilize logic states during power-up, particularly under abnormal conditions such as power transients, leading to potential unknown states in logic gates.
Innovation Solution
An electrical reset circuit utilizing Zener diodes, transistors, and a delay circuit with flip-flops to generate a reset pulse with adjustable duration and amplitude, ensuring proper stabilization of logic gates during power-up by responding to voltage thresholds and using analog circuitry for power-on detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If simple R-C networks are used for reset circuits, then the device complexity is reduced, but the reliability of logic state stabilization under abnormal conditions deteriorates
Solution Approach 1:
The patent changes the electrical parameters of the reset circuit by introducing Zener diodes with specific breakdown voltages (first Zener voltage and second Zener voltage) to create voltage threshold detection. This allows the circuit to respond to abnormal power conditions by generating reset pulses when voltage exceeds predetermined thresholds, thereby improving reliability without significantly increasing complexity
Solution Approach 2:
The patent introduces intermediate components (Zener diodes, transistors, and delay circuits) that mediate between the power supply and the logic gates. These intermediaries detect voltage thresholds and generate appropriate reset signals, acting as a buffer that protects logic gates from abnormal power conditions while maintaining circuit functionality
2Adaptability or versatility
If R-C time constants are adjusted for variable reset duration, then the adaptability to different operating conditions is improved, but the ability to compensate for power transients deteriorates
Solution Approach 1:
The patent creates a dynamic reset circuit that automatically adjusts its behavior based on real-time voltage conditions. The Zener diodes and transistors form a dynamic response system that generates reset pulses of appropriate duration based on when voltage thresholds are exceeded, rather than using fixed R-C time constants. This dynamic adaptation allows the circuit to handle both normal startup sequences and abnormal power transients effectively
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The reset circuit stabilizes logic gates during power-up, providing a longer duration reset pulse that adapts to system performance and hardware requirements, ensuring proper reset even under transient conditions.
Implementation Method 1
a first device electrically connected between a power supply input and a first node. The first device is configured to conduct current after the power supply input reaches a first voltage threshold. The electrical reset circuit also includes a second device electrically connected between the power supply input and a second node, where the second device is configured to conduct current after the power supply input reaches a second voltage threshold
Data Source
AI summary
An electrical reset circuit is configured to generate a reset pulse to reset one or more electrical components. The electrical reset circuit includes a first device electrically connected between a power supply input and a first node. The first device is configured to conduct current after the power supply input reaches a first voltage threshold. The electrical reset circuit also includes a second device electrically connected between the power supply input and a second node, where the second device is configured to conduct current after the power supply input reaches a second voltage threshold. In some examples, the electrical circuit includes a delay circuit configured to delay the reset pulse. Corresponding methods to providing a reset pulse are also contemplated.