Temperature-Compensated Clock Generation for Uniform Oscillator Frequency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Semiconductor integrated circuits face challenges in maintaining uniform clock signal frequencies due to variations in manufacturing processes, operation voltages, and temperatures, leading to potential degradation in performance and yield.
Innovation Solution
A clock generation circuit incorporating a temperature compensation circuit and an oscillator that generates a temperature-compensated frequency selection code based on the operation temperature, ensuring the clock signal frequency remains uniform regardless of temperature variations by counterbalancing the temperature characteristics of the oscillator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional oscillator is used to generate clock signals, then the circuit can operate at various frequencies, but the clock signal frequency varies with temperature and manufacturing process variations
Solution Approach 1:
The patent changes the frequency selection code parameter based on temperature conditions. A temperature compensation circuit generates different frequency selection codes corresponding to different temperature ranges, thereby adjusting the oscillator's output frequency to maintain uniformity across temperature variations while preserving multi-frequency operation capability
Solution Approach 2:
The patent implements a feedback mechanism where the temperature compensation circuit monitors temperature conditions and adjusts the frequency selection code accordingly. This closed-loop approach ensures that the clock signal frequency remains stable by continuously compensating for temperature-induced variations through dynamic parameter adjustment
2Device complexity
If frequency selection code is fixed, then the oscillator design is simple, but the clock signal frequency is sensitive to temperature variations
Solution Approach 1:
The patent segments the frequency selection code into multiple parts: a fixed base code and a temperature-dependent compensation code. This segmentation allows the oscillator to maintain a simple fixed design for the base frequency while adding a separate, manageable temperature compensation component that reduces temperature sensitivity without significantly increasing overall complexity
Data Source
AI summary
A clock generation circuit includes a temperature compensation circuit and an oscillator. The temperature compensation circuit is configured to generate a temperature-compensated frequency selection code that varies depending on an operation temperature based on a difference between the operation temperature and a reference temperature and based on a temperature-independent frequency selection code that is fixed regardless of the operation temperature. The oscillator is configured to generate a clock signal that has an operation frequency that is based on the temperature-compensated frequency selection code, such that the operation frequency is uniform regardless of the operation temperature. Effects of the operation temperature may be reduced by generating the temperature-compensated frequency selection code that reflects the temperature characteristic of the oscillator using the output value of the temperature sensor and by controlling the oscillator using the temperature-compensated frequency selection code.