Temperature-Compensated Oscillator Control for Frequency Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional oven controlled crystal oscillators face performance degradation due to high target temperatures, which affect the stability of integrated circuits (ICs) used in temperature compensation systems.
Innovation Solution
A temperature-controlled and temperature-compensated oscillating device that includes a heater, a frequency source, and a voltage controlled oscillation circuit, which adjusts the operating temperature and reduces frequency variations by using a temperature-controlled circuit and sensors to manage ambient temperature fluctuations, preventing IC performance degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the target temperature is set high to compensate for frequency variations, then the frequency stability is improved, but the IC performance degrades
Solution Approach 1:
The patent changes the target temperature parameter dynamically based on ambient temperature conditions. When ambient temperature is low, a higher target temperature is set to compensate for frequency variations. When ambient temperature is high, a lower target temperature is set to prevent IC degradation. This parameter change resolves the contradiction by adapting the temperature setting to environmental conditions.
Solution Approach 2:
The patent implements dynamic temperature control where the target temperature is not fixed but adjusts according to ambient temperature measurements. The control unit dynamically modifies the heating target based on temperature sensor feedback, transitioning from a static high temperature approach to a dynamic adaptive approach that balances frequency stability with IC protection.
2Reliability
If the ambient temperature is low, then frequency variations increase, but setting a high target temperature causes IC degradation
Solution Approach 1:
The patent changes the target temperature parameter dynamically based on ambient temperature conditions. When ambient temperature is low, a higher target temperature is set to compensate for frequency variations. When ambient temperature is high, a lower target temperature is set to prevent IC degradation. This parameter change resolves the contradiction by adapting the temperature setting to environmental conditions.
Solution Approach 2:
The patent employs feedback control where temperature sensors monitor both ambient temperature and heater temperature, and the control unit adjusts the heating target based on this feedback. The system continuously monitors environmental conditions and modifies the temperature compensation strategy accordingly, ensuring frequency stability while preventing IC overheating.
3Reliability
If a thermostatic oven is used to maintain constant temperature, then frequency stability is improved, but device complexity increases
Solution Approach 1:
The patent extracts the temperature control function from a complete thermostatic oven system and implements a simplified version using only necessary components (temperature sensors and a control unit that adjusts heating). This extraction removes unnecessary complexity while maintaining the essential temperature compensation function, resolving the contradiction between stability and simplicity.
Solution Approach 2:
The patent changes the control strategy from maintaining a constant high temperature (thermostatic oven approach) to dynamically adjusting the target temperature based on ambient conditions. This parameter change allows for a simpler system structure that achieves frequency stability through adaptive control rather than through complex constant-temperature maintenance.
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
The solution effectively stabilizes the frequency source by adjusting the operating temperature and reducing frequency variations, thereby preventing IC performance degradation from high target temperatures.
Implementation Method 1
a first temperature sensor (44), wherein the first temperature sensor is configured to sense the ambient temperature and generates a first detected voltage (D1) based on the ambient temperature
Implementation Method 2
a heater (20, 30, 40), wherein the temperature controlled circuit (33) is coupled to the heater (20, 30, 40)... drives the heater to a target temperature to adjust an operating temperature of the frequency source
Implementation Method 3
The frequency of the frequency source is temperature-dependent on the ambient temperature... the voltage controlled oscillation circuit receives the first detected voltage (D1) to drive the frequency source and reduce a frequency variation of the frequency source resulted from a variation of the ambient temperature
Data Source
AI summary
A temperature-controlled and temperature-compensated oscillating device and a method of temperature control and temperature compensation is disclosed. The operating temperature of a frequency source is adjusted by driving a heater to a target temperature when the ambient temperature is in a first range between a first temperature and a second temperature higher than the third temperature. The frequency variation of the frequency source resulted from a variation of the ambient temperature is reduced by applying a voltage to the frequency source when the ambient temperature is in a second range between a third temperature and a fourth temperature higher than the third temperature. The third temperature is higher than the first temperature.