Ring Oscillator Voltage Adaptation for Temperature-Stable Clocking
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Solution Overview
Problem
Conventional ring oscillators exhibit significant frequency scatter due to manufacturing process fluctuations and ambient temperature variations, making them unsuitable for applications requiring precise clock pulse rates, especially in energy-efficient systems where stable clock signals are needed immediately after activation.
Innovation Solution
A ring oscillator device with a voltage supply circuit that adapts the input voltage based on ambient temperature to compensate for frequency fluctuations, utilizing a cascadable source follower circuit with self-conducting depletion transistors and a temperature sensor element to provide a stable clock signal within a few nanoseconds after activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional ring oscillators are used, then the circuit can be activated quickly, but the frequency scatter is large due to manufacturing process fluctuations and temperature variations
Solution Approach 1:
The patent changes the supply voltage parameter dynamically to compensate for frequency deviations. A voltage supply circuit adjusts the input voltage to the ring oscillator based on detected frequency errors, thereby maintaining stable operation despite manufacturing variations and temperature changes.
Solution Approach 2:
The patent implements a feedback mechanism where the actual frequency of the ring oscillator is monitored and compared with a reference frequency. The voltage supply circuit receives this frequency information and adjusts the supply voltage accordingly to eliminate frequency deviations, creating a closed-loop control system.
2Manufacturing precision
If temperature-compensated precision clock pulse generators are used, then frequency precision is improved, but the switching time increases to more than 10 μs
Solution Approach 1:
The patent makes the supply voltage dynamic rather than static. The voltage supply circuit continuously adapts the input voltage to the ring oscillator in real-time based on frequency measurements, enabling fast response to frequency deviations without requiring long stabilization periods.
Solution Approach 2:
The voltage supply circuit is prepared to immediately adjust the supply voltage when frequency deviations are detected. By having the voltage control mechanism ready and responsive, the system can quickly correct frequency errors without waiting for gradual stabilization.
3Manufacturing precision
If the input voltage of the ring oscillator is adapted as a function of ambient temperature, then temperature-dependent frequency fluctuations are compensated, but the device complexity increases
Solution Approach 1:
The voltage supply circuit serves multiple functions: it provides the necessary supply voltage to the ring oscillator, senses frequency deviations, and adjusts the voltage to compensate for temperature effects. By combining these functions in a single integrated circuit, the overall device complexity is minimized.
Solution Approach 2:
The system performs self-regulation where the voltage supply circuit automatically detects and corrects its own operating conditions. The frequency detection and voltage adjustment are handled by the same circuit that supplies power, eliminating the need for separate complex control systems.
Data Source
AI summary
An oscillator device based on a ring oscillator, in which temperature-dependent fluctuations in the frequency of the clock signal of a ring oscillator can be compensated by adapting the supply voltage of the ring oscillator. For this purpose, the supply voltage of the ring oscillator is adapted as a function of an ambient temperature, using a voltage supply circuit.