Multi-Threshold Reset Circuit for Low-Voltage Testing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electrical devices often operate unpredictably outside a specified voltage range, leading to variability in supply voltage requirements between production lots, necessitating conservative minimum voltage settings to ensure deterministic behavior, and conventional reset circuits are inadequate for managing these variations during power-up and brownout conditions.
Innovation Solution
A multi-threshold reset circuit with a first mode for normal operation and a second mode for testing, allowing devices to be tested at lower voltages than the specified minimum, with specific voltage thresholds for asserting or deasserting a reset signal based on supply voltage levels, ensuring reliable operation across different voltage conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conservative minimum supply voltage is specified to ensure deterministic operation across all production lots, then reliability is improved, but manufacturing precision deteriorates because devices with better voltage margin are underutilized
Solution Approach 1:
The patent applies parameter changes by introducing multiple voltage thresholds (first threshold above minimum, second threshold at minimum) that can be selectively activated. This allows the system to change operational parameters based on actual device performance, enabling devices with better voltage margin to operate at higher voltages while maintaining deterministic operation for all devices.
Solution Approach 2:
The patent implements dynamics by making the reset circuit configurable between different threshold modes. The circuit can dynamically adjust which threshold is active based on device characterization, allowing the system to adapt to actual device performance rather than relying on a static conservative threshold.
2Manufacturing precision
If low-voltage testing is performed to predict field reliability, then manufacturing precision is improved, but device complexity increases due to the need for multiple voltage thresholds and modes
Solution Approach 1:
The patent applies universality by designing a single reset circuit that can perform multiple functions: it can operate in first mode using the first threshold for normal operation, or in second mode using the second threshold for low-voltage testing. This multi-functional design eliminates the need for separate testing and operational circuits.
Solution Approach 2:
The patent implements preliminary action by performing device characterization and threshold selection during manufacturing or initialization. The appropriate threshold mode is predetermined based on device performance, allowing low-voltage testing to be conducted without adding operational complexity during field use.
3Reliability
If multiple reset circuits are used for different voltage levels in a system, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing a single reset circuit that can handle multiple voltage levels through configurable thresholds. The circuit can be set to monitor different voltage levels by selecting appropriate threshold modes, eliminating the need for separate reset circuits for each voltage level while maintaining reliable voltage level management.
Data Source
AI summary
A device can include one or more circuits that are configured to be powered by a supply voltage having a specified minimum operating value and a specified nominal operating value; and a reset circuit having a first voltage threshold and a second voltage threshold, the first voltage threshold having a value between the specified minimum operating value and the specified nominal operating value, the second voltage threshold having a value that is less than the specified minimum operating voltage. The reset circuit can be configured to a) reset the one or more circuits when the device is functioning in a first mode and the supply voltage drops below the first threshold and b) reset the one or more of circuits when the device is functioning in a second mode and the supply voltage drops below the second threshold.