Reset Signal Generator With Temperature-Compensated Tripping Voltage
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Solution Overview
Problem
Conventional reset signal generating circuits in semiconductor memory devices are sensitive to temperature variations, leading to unstable operation and a reduced margin of the tripping voltage, especially at high or low temperatures, which affects the desired operating range.
Innovation Solution
A reset signal generator with a variation reducing unit that shifts the tripping voltage by a variable amount for different temperatures, minimizing the range of the tripping voltage and reducing temperature sensitivity, comprising a trip signal generator, an inverter unit, and an output unit, including diode-connected NMOSFETs and resistors, and additional PMOSFETs and NMOSFETs to adjust the tripping voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional level sensing unit with a fixed threshold voltage is used, then the reset signal can be generated at a specific voltage level, but the tripping voltage range becomes excessively wide with temperature variation, leading to unstable operation
Solution Approach 1:
The patent applies the Dynamics principle by making the threshold voltage dynamic rather than fixed. The level sensing unit uses temperature-dependent circuit elements (such as transistors with different threshold voltage characteristics) that automatically adjust the tripping voltage based on temperature conditions. This dynamic adjustment compensates for temperature effects, maintaining stable reset signal generation across varying temperatures without requiring external temperature sensors or complex control circuits.
Solution Approach 2:
The patent implements Parameter changes by modifying the electrical characteristics of the level sensing unit to counteract temperature variations. Specifically, the circuit employs transistors and resistors configured such that their combined parameters (threshold voltages, resistance values) change with temperature in a way that keeps the overall tripping voltage within a narrow, stable range. This parameter compensation approach directly addresses the temperature sensitivity issue while maintaining operational reliability.
2Use of energy by moving object
If the tripping voltage is lowered to improve operation at low supply voltages, then the device can operate at lower voltages, but the margin of the tripping voltage is reduced, making the system more sensitive to variations
Solution Approach 1:
The patent usesParameter changes to adjust the tripping voltage dynamically based on temperature. By employing transistors with complementary threshold voltage temperature coefficients (e.g., PMOS and NMOS with opposite characteristics), the circuit maintains an optimal tripping voltage margin even at low supply voltages. The parameter compensation ensures that the voltage margin remains sufficient to prevent noise-induced false triggering while enabling low-voltage operation.
3Object-affected harmful factors
If additional circuit elements are added to reduce temperature sensitivity, then the temperature stability improves, but the device complexity increases
Solution Approach 1:
The patent appliesUniversality by designing the level sensing unit to perform multiple functions simultaneously: voltage level detection, temperature compensation, and reset signal generation. The same transistors and resistors that establish the tripping voltage also provide temperature compensation through their inherent temperature-dependent characteristics. This multi-functionality approach reduces temperature sensitivity without adding separate compensation circuits, thereby avoiding increased device complexity.
Solution Approach 2:
The circuit employsSelf-service by utilizing the natural temperature-dependent characteristics of standard semiconductor devices (transistors and resistors) to automatically compensate for temperature variations. The level sensing unit self-adjusts its tripping voltage based on temperature without requiring external temperature sensors, microcontrollers, or complex compensation circuits. This self-compensating mechanism achieves temperature stability while maintaining simple circuit architecture.
Data Source
AI summary
A reset signal generator includes an output unit, a trip signal generator, an inverter unit, and a variation reducing unit. The output unit generates a reset signal from a pre-reset signal, and the reset signal follows a supply voltage signal before transitioning to a ground level when the supply voltage signal reaches a tripping voltage. The variation reducing unit is coupled to the inverter unit for reducing a range of the tripping voltage with temperature variations.