On-Chip Ring Oscillator Temperature Control Using Logic-Gate Heating
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Solution Overview
Problem
Temperature-sensitive components in integrated circuits, such as ring oscillators, experience unpredictable behavior due to rapid temperature changes at startup, affecting entropy generation and physical unclonable functions, leading to unreliable information security. Existing solutions like thermostat-controlled enclosures are large, expensive, and slow, while modifying thermal properties is unstable and costly, and compensating for circuit behavior at manufacturing cannot handle multiple oscillation frequencies.
Innovation Solution
Implementing a method within the integrated circuit system that uses a heater and temperature sensor, where a second plurality of logic gates generates controlled heat and measures temperature, allowing the ring oscillator to stabilize at predefined temperatures, utilizing standard logic gates and ring oscillator configurations to achieve fast and cost-effective temperature stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If thermostat controlled enclosures are used to stabilize temperature, then temperature stability is improved, but device size, cost, and response time worsen
Solution Approach 1:
The patent applies local quality by placing a heater and temperature sensor directly on the ring oscillator circuit itself, rather than using a large thermostat enclosure. This localized approach heats only the specific temperature-sensitive component, achieving temperature stability with minimal device size increase. The heater is integrated into the same substrate as the ring oscillator, providing precise local thermal control.
Solution Approach 2:
The patent introduces a temperature sensor as an intermediary element that monitors the ring oscillator temperature and provides feedback to a control circuit. This intermediary enables closed-loop temperature control, allowing the system to maintain temperature stability by dynamically adjusting heater power based on real-time temperature measurements, rather than relying on passive thermal insulation.
2Stability of the object's composition
If thermostat controlled enclosures are used to stabilize temperature, then temperature stability is improved, but response time worsens
Solution Approach 1:
The patent applies preliminary action by initiating the heater before the ring oscillator is fully operational, during the startup phase. The control circuit activates the heater in advance to preemptively counteract temperature drops that would occur when the oscillator begins consuming power. This proactive heating approach maintains temperature stability without requiring slow thermal mass enclosures.
Solution Approach 2:
The patent implements feedback control by continuously monitoring the ring oscillator temperature with a temperature sensor and dynamically adjusting heater power based on the measured temperature. The control circuit compares the measured temperature against a target value and modulates heater activation accordingly, enabling fast response to temperature changes without the lag inherent in large thermal enclosures.
3Ease of manufacture
If manufacturing compensation is used, then cost is reduced, but ability to handle multiple oscillation frequencies is lost
Solution Approach 1:
The patent applies self-service by enabling the ring oscillator circuit to monitor and regulate its own temperature using an integrated temperature sensor and heater controlled by the circuit itself. This self-regulating capability eliminates the need for external manufacturing compensation techniques, providing both cost-effectiveness and the ability to adapt to varying operating conditions including multiple oscillation frequencies.
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
This approach provides direct and efficient temperature stabilization for ring oscillators, reducing large temperature variations, and is cost-effective, ensuring reliable entropy generation and information security by stabilizing ring oscillators at predefined temperatures.
Implementation Method 1
generating a controlled amount of heat using a second plurality of logic gates to implement a heater
Implementation Method 2
measuring a temperature of the ring oscillator using the second plurality of logic gates to implement a temperature sensor
Data Source
AI summary
An integrated circuit system is provided. The system includes a ring oscillator including a first plurality of logic gates connected in a ring configuration. The system also includes a second plurality of logic gates used to implement a heater to generate a controlled amount of heat. The second plurality of logic gates is also used to implement a temperature sensor to measure a temperature of the ring oscillator. The system further includes one or more logic circuits coupled to the heater and the temperature sensor. The one or more logic circuits are used to control the heater to heat the ring oscillator only until the temperature of the ring oscillator is one of a plurality of predefined temperatures, during or after which the ring oscillator starts and operate.