Crystal Oscillator Compensation Using Temperature Change Rate
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Solution Overview
Problem
Existing methods for stabilizing crystal oscillator frequency rely on static curve models that fail to accurately compensate for temperature variations, especially when the temperature change rate increases, leading to errors in frequency stability.
Innovation Solution
A system and method that configures a crystal oscillator with a temperature sensor, exposing it to a controlled environment to generate dynamic response parameters through a temperature test profile, allowing for accurate frequency compensation by applying these parameters to a temperature compensation model.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a static curve model is used for temperature compensation, then the device complexity is reduced, but the measurement precision of frequency stability deteriorates when temperature change rate increases
Solution Approach 1:
The patent transitions from a static curve model to a dynamic compensation model that incorporates temperature change rate (dT/dt) as an additional parameter. The compensation equation becomes f_corrected = f_nominal + Δf_static(T) + Δf_dynamic(T, dT/dt), where the dynamic term accounts for transient thermal effects. This dynamic approach maintains accuracy during rapid temperature changes while preserving the overall system structure.
Solution Approach 2:
The invention introduces a new parameter (temperature change rate dT/dt) to the compensation model beyond the static temperature parameter T. By measuring both the instantaneous temperature and its rate of change, the system can predict and compensate for transient frequency deviations that occur during thermal transients, thereby improving frequency stability without requiring a completely complex system redesign.
2Speed
If the temperature change rate increases, then the responsiveness to environmental changes improves, but the frequency stability deteriorates due to static model limitations
Solution Approach 1:
The system continuously monitors both temperature T and temperature change rate dT/dt, feeding these parameters into the compensation model. This feedback mechanism allows the system to dynamically adjust the frequency correction based on current thermal conditions and their rate of change, maintaining frequency stability even during rapid temperature transitions that would cause deviations in static model systems.
3Stability of the object's composition
If a dynamic compensation model incorporating temperature change rate is used, then the frequency stability improves, but the device complexity increases
Solution Approach 1:
The patent pre-characterizes the frequency vs. temperature relationship and stores correction data in lookup tables or pre-calculated coefficients during manufacturing. During operation, the system only needs to measure current temperature and dT/dt, then interpolate or calculate the appropriate correction from pre-stored data. This approach avoids the need for complex real-time computations while achieving dynamic compensation, thereby limiting the increase in device complexity.
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 improved frequency stability by characterizing the thermal dynamic response of the crystal oscillator, effectively addressing the limitations of static models and ensuring accurate frequency compensation across varying temperature conditions.
Implementation Method 1
the crystal oscillator component includes a temperature sensor
Implementation Method 2
Crystal oscillators, which are components in electronic systems that are widely used to generate fixed frequency signals, are known to be affected by environmental conditions, such as temperature
Data Source
AI summary
A system and method for providing temperature compensation in a oscillator component (such as a crystal oscillator component) that includes a closely-located temperature sensing device. The crystal oscillator component in example systems and methods is exposed to a temperature profile during a calibration procedure. Temperature and frequency data are collected and applied to coefficient generating function according to a temperature compensation model to generate a set of coefficients that are used in the temperature compensation model in an application device. The generated coefficients are stored in a coefficient memory accessible to an application device during operation.