Temperature-Compensated Oscillator With Amplitude-Based Frequency Control
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Solution Overview
Problem
Conventional oscillators with temperature compensation face deteriorated accuracy in maintaining constant frequency variation across temperatures, especially when requiring high precision frequency stability below 0.5 ppm, due to fixed adjustments in capacitance values by control signals.
Innovation Solution
Incorporating an oscillation amplitude adjusting section that varies the oscillation amplitude based on control signals, allowing for precise control of oscillation frequency through a combination of temperature compensation and Auto Frequency Control mechanisms, using components like MOS transistors and amplitude limiter circuits to regulate capacitance and oscillation stage current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fixed adjustments in capacitance values are made by control signals in conventional oscillators, then temperature compensation is achieved, but frequency stability deteriorates when high precision below 0.5 ppm is required
Solution Approach 1:
The invention applies dynamics by making the oscillation amplitude adjustable through control signals. The oscillation amplitude adjusting section varies the amplitude dynamically based on control signals, allowing the system to adapt to different operating conditions and maintain both temperature compensation accuracy and frequency stability. This dynamic adjustment capability enables the oscillator to achieve high precision frequency stability below 0.5 ppm while maintaining effective temperature compensation.
2Stability of the object's composition
If capacitance values are adjusted by control signals to maintain constant frequency, then temperature characteristics are compensated, but frequency variation consistency across temperatures deteriorates
Solution Approach 1:
The invention applies parameter changes by varying the oscillation amplitude as a control parameter. The oscillation amplitude adjusting section changes the amplitude parameter in response to control signals, which indirectly affects the frequency characteristics. This parameter change approach allows the system to maintain consistent frequency variation across different temperatures while still achieving temperature compensation, thereby improving both frequency constancy and variation consistency.
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 enables maintaining constant oscillation frequency variation, improving temperature compensation accuracy and achieving the required high precision frequency stability by minimizing differences in oscillation frequency changes across temperature variations.
Implementation Method 1
an oscillation circuit to oscillate a resonator
Implementation Method 2
an oscillation amplitude adjusting section for varying an oscillation amplitude of the resonator
Data Source
AI summary
Provided is a temperature compensated oscillator includes an oscillation circuit for oscillating an oscillator. In the oscillator, when an oscillation frequency is changed by a second control signal after being controlled by a first control signal, variation in the oscillation frequency due to a second control signal is set to a fixed amount. The oscillation frequency of the oscillator is controlled on the basis of both the first control signal and the second control signal, but an oscillation amplitude adjusting section is also added, the oscillation amplitude adjusting section allowing the oscillation amplitude of the oscillator to be changed by the second control signal. The oscillator thus allows a fixed amount of oscillation frequency control over a wide range (full range) of oscillation frequency control due to the first control signal.