Oscillator Aging Correction Using Environmental Component Removal
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Solution Overview
Problem
Existing oscillators, such as OCXO and TCXO, face challenges in maintaining high frequency stability due to aging effects, which are exacerbated by environmental changes like temperature and power supply voltage variations, making accurate aging correction difficult, especially during hold-over states where reference signals are absent or abnormal.
Innovation Solution
A circuit device with a processor that acquires environmental change component information, removes environmental and aging change components from frequency control data, and performs aging correction using a Kalman filter process to estimate a true value of the oscillation frequency, ensuring accurate aging correction even in hold-over states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aging correction is performed using stored correspondence relationship information between correction value and elapsed time, then aging correction can be applied during hold-over state, but the correction accuracy is insufficient due to element variations and environmental changes
Solution Approach 1:
The system performs preliminary actions by continuously measuring oscillation frequency and acquiring environmental change information during normal operation (before hold-over state occurs). This data is stored and processed to establish accurate aging characteristics specific to each oscillator, enabling precise aging correction during subsequent hold-over periods when reference signals are unavailable.
Solution Approach 2:
The system implements feedback mechanisms by continuously monitoring oscillation frequency, comparing it with reference frequency, and using the frequency deviation information along with environmental change data to refine aging correction values. This feedback loop enables the system to adapt to individual oscillator characteristics and maintain high correction accuracy.
2Reliability
If environmental change components are not removed from frequency control data, then the processing is simpler, but aging correction accuracy deteriorates due to mixed environmental influences
Solution Approach 1:
The system segments the frequency control data by separating environmental change components from aging change components.通过使用温度传感器、电压检测电路等获取环境变化信息，系统能够将频率控制数据中的环境变化成分（温度变化成分、电源电压变化成分）与老化变化成分区分开来，仅使用老化变化成分进行高精度老化修正。
Solution Approach 2:
The system introduces environmental change component information as an intermediary element that mediates between the raw frequency control data and the aging correction process. This intermediary information enables the selective removal of environmental influences, allowing the aging correction to be performed on purified data that reflects only aging effects.
3Stability of the object's composition
If individual element variations are not accounted for, then the system is simpler to implement, but frequency stability deteriorates due to differences in aging behavior between individual oscillators
Solution Approach 1:
The system enables each oscillator to serve itself by individually characterizing its own aging characteristics through continuous frequency measurement and environmental monitoring. Each oscillator builds its own aging profile based on its specific behavior, eliminating the need for generic correction models and accounting for individual element variations inherent to each device.
Solution Approach 2:
The system dynamically adjusts correction parameters based on individual oscillator characteristics. By continuously measuring frequency deviations and correlating them with environmental changes, the system identifies and adapts to unique aging patterns of each oscillator, enabling personalized aging correction that maintains frequency stability despite element variations.
Data Source
AI summary
A circuit device includes an oscillation signal generation circuit that generates an oscillation signal having an oscillation frequency, the oscillation frequency being a frequency set by using frequency control data, and a processor that is configured to perform a signal process on input frequency control data, and. The processor is configured to acquire the frequency control data from which an environmental change component is removed of the environmental change component and an aging change component by using environmental change component information, and perform aging correction on the basis of the frequency control data from which the environmental change component is removed.