RC Oscillator Temperature Compensation Without Lookup Tables
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Solution Overview
Problem
Embedded RC oscillators in integrated circuit devices face challenges in maintaining stability over temperature variations, particularly in applications like CAN protocols, where conventional temperature compensation methods require significant memory resources and time, increasing costs and power consumption.
Innovation Solution
The implementation of an oscillator circuit with static calibration to achieve a symmetrical frequency/temperature profile, allowing for a standardized dynamic temperature compensation scheme that eliminates the need for part-specific tables, reducing memory requirements and costs, and using a current source with a PTAT component to adjust the frequency/temperature profile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional temperature compensation schemes are used to maintain frequency stability over temperature, then frequency stability is improved, but memory resources and time are increased
Solution Approach 1:
The patent changes the parameter of frequency compensation by transitioning from static lookup tables to dynamic continuous adjustment. The oscillator circuit continuously monitors temperature and adjusts its output frequency in real-time based on measured temperature deviations, eliminating the need for large memory tables while maintaining frequency stability across temperature ranges.
Solution Approach 2:
The invention implements dynamic temperature compensation where the oscillator circuit continuously adapts its frequency based on real-time temperature measurements. Instead of using fixed static compensation values stored in memory, the system dynamically adjusts compensation parameters based on current temperature conditions, reducing memory requirements while improving responsiveness.
2Reliability
If conventional temperature compensation schemes are used to maintain frequency stability over temperature, then frequency stability is improved, but die size is increased
Solution Approach 1:
The patent eliminates the need for large memory structures by changing from static table-based compensation to dynamic parameter adjustment. The oscillator uses continuous temperature monitoring and real-time frequency adjustment, which requires minimal on-chip memory while maintaining frequency stability, thereby reducing die size.
Solution Approach 2:
The invention extracts and removes the large memory tables required by conventional temperature compensation schemes from the oscillator circuit. By replacing table-based compensation with continuous dynamic adjustment based on temperature sensing, the patent eliminates the need for extensive memory resources, significantly reducing die area.
3Reliability
If conventional temperature compensation schemes are used to maintain frequency stability over temperature, then frequency stability is improved, but power consumption is increased
Solution Approach 1:
The patent implements dynamic temperature compensation that continuously adjusts oscillator frequency based on real-time temperature measurements. This dynamic approach uses simple temperature sensing and proportional frequency adjustment, which consumes less power than conventional methods that require accessing and processing large memory tables, thereby reducing power consumption while maintaining frequency stability.
4Reliability
If static calibration is used to achieve symmetrical frequency/temperature profile, then frequency stability is improved, but manufacturing complexity is increased
Solution Approach 1:
The patent applies static calibration during the manufacturing process to establish a symmetrical frequency/temperature profile baseline. By performing this calibration once during production to create a predictable temperature characteristic, the system simplifies subsequent dynamic compensation operations, as the oscillator follows a known symmetrical pattern that requires less complex real-time adjustment algorithms.
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 ensures consistent frequency stability across temperature ranges without the need for part-specific data storage, reducing die area, cost, and power consumption, while simplifying dynamic temperature compensation.
Implementation Method 1
arranged to be dynamically calibrated to enable an oscillating frequency of the oscillator circuit to be dynamically adjusted
Data Source
AI summary
An oscillator circuit comprising at least a first component arranged to be statically calibrated to calibrate the oscillator circuit to achieve a symmetrical frequency/temperature profile for the oscillator circuit. The oscillator circuit further comprises at least one further component arranged to be dynamically calibrated to enable an oscillating frequency of the oscillator circuit to be dynamically adjusted, and at least one temperature compensation component arranged to receive at least one temperature indication for the oscillator circuit and to dynamically adjust the at least one further component based at least partly on the at least one received temperature indication. In some examples, the at least one temperature compensation component is arranged to dynamically adjust the at least one further component based on a standardized temperature compensation scheme.