Temperature-Dependent Power Supply Circuitry for IC Reliability
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Solution Overview
Problem
Integrated circuits with pass transistors experience reliability issues due to temperature-dependent gate breakdown voltage, leading to potential dielectric breakdown when overdriven for performance enhancement, as conventional overdriving methods do not account for varying temperatures.
Innovation Solution
The power supply circuitry generates a temperature-dependent power supply voltage using temperature sensors and multiplexing circuitry, with clamp voltage generation and control, as well as voltage overshoot-undershoot protection, to maintain stable voltage levels across varying temperatures and transient disturbances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pass transistors are overdriven with elevated gate control signals to increase performance, then switching speed and performance are improved, but transistor reliability deteriorates due to potential dielectric breakdown
Solution Approach 1:
The patent implements dynamic adjustment of the positive power supply voltage based on temperature conditions. The voltage is elevated above nominal levels when temperature is low to enhance performance, and reduced to nominal or lower levels when temperature is high to prevent breakdown. This dynamic voltage scaling allows the system to optimize performance while maintaining reliability across varying thermal conditions.
Solution Approach 2:
The patent changes the voltage parameter of the power supply based on temperature measurements. By monitoring temperature and adjusting the power supply voltage accordingly (elevating it at low temperatures, reducing it at high temperatures), the system adapts the electrical parameters to match thermal conditions, thereby achieving both performance enhancement and reliability protection.
2Productivity
If conventional overdriving methods are used with fixed elevated voltage across all temperatures, then performance is maintained, but transistor breakdown risk increases at high temperatures
Solution Approach 1:
The patent employs temperature sensing circuitry that continuously monitors the thermal state of the pass transistors and feeds this information back to the voltage scaling circuit. This feedback mechanism enables the system to detect high-temperature conditions and automatically reduce the power supply voltage to prevent dielectric breakdown, while maintaining elevated voltage during low-temperature operation for optimal performance.
Solution Approach 2:
The patent takes preliminary protective action by reducing the power supply voltage before dielectric breakdown can occur. The temperature monitoring and voltage scaling system proactively adjusts voltage levels in response to thermal conditions, preventing the harmful effect of breakdown rather than reacting after damage occurs.
Data Source
AI summary
An integrated circuit having power supply circuitry configured to generate a temperature dependent power supply voltage is provided. The power supply circuitry may include temperature sensors formed at different regions on the integrated circuit. The power supply circuitry may use a selected one of the temperature sensors to vary the temperature dependent power supply voltage. The power supply circuitry may include voltage clamping circuitry configured to clip the power supply voltage to an upper fixed voltage level when the power supply voltage exceeds a first predetermined threshold and to clip the power supply voltage to a lower fixed voltage level when the power supply voltage falls below a second predetermined threshold. The power supply circuitry may also include voltage overshoot-undershoot protection circuitry configured to keep the temperature dependent power supply voltage within a specified voltage range in the presence of transient perturbations in the temperature dependent power supply voltage.