Oven-Controlled Crystal Oscillator Thermal Stability
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Solution Overview
Problem
Conventional oven-controlled crystal oscillators face challenges in downsizing and reducing height due to their multi-layered circuit board structure, which affects thermal coupling and stability of temperature control, requiring complex element arrangements and increased time for optimization.
Innovation Solution
The implementation of a surface mount type crystal resonator and power transistor configuration on a base substrate with a thermosensor, utilizing high thermal conductivity resin for bonding and efficient heat transmission, and optionally using a lead frame for further miniaturization and stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a multi-layered circuit board structure is used for conventional oven-controlled crystal oscillators, then the structural stability is improved, but the device height and volume increase, making downsizing difficult
Solution Approach 1:
The patent merges multiple circuit boards into a single substrate by directly mounting the crystal resonator, power transistor, and temperature sensor on the same substrate. This eliminates the need for multi-layered circuit board structures while maintaining structural stability, thereby reducing device height and enabling downsizing.
Solution Approach 2:
The patent transitions from a vertical multi-layered structure to a planar single-substrate structure. By redistributing components on the same plane rather than stacking them vertically across multiple layers, the device achieves compactness in the height dimension while maintaining functional integrity.
2Adaptability or versatility
If circuit elements are decentralized on multiple circuit boards, then the layout flexibility is improved, but the thermal coupling between elements deteriorates, affecting temperature control stability
Solution Approach 1:
The patent combines all critical components (crystal resonator, power transistor, temperature sensor) on a single substrate, ensuring strong thermal coupling. This proximity arrangement facilitates efficient heat transmission and enables stable temperature control, eliminating the thermal isolation issues present in decentralized multi-board configurations.
3Strength
If a two-tier circuit board structure with metal pins is used, then the electrical and mechanical connection is improved, but the device complexity and manufacturing time increase
Solution Approach 1:
The patent eliminates the two-tier circuit board structure with metal pins by mounting all components directly on a single substrate. This integration reduces structural complexity and simplifies manufacturing, while the direct mounting method maintains strong electrical and mechanical connections between components and the substrate.
4Stability of the object's composition
If optimization of element arrangement is performed to improve thermal coupling, then the temperature control stability is improved, but the development time and complexity increase
Solution Approach 1:
The patent achieves optimal thermal coupling by design through the direct mounting configuration, where the crystal resonator, power transistor, and temperature sensor are positioned in close proximity on the same substrate. This inherent design ensures efficient heat transmission without requiring extensive iterative optimization, thereby reducing development time and 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 configuration allows for a more compact design with improved thermal stability, reduced power consumption, and easier temperature control, achieving lower frequency variation and enhanced reliability.
Implementation Method 1
a power transistor 4 as a heat source
Implementation Method 2
a thermosensor (a thermistor, a thermocouple, and a diode)
Implementation Method 3
a liquid heat conductive resin 20 is applied so as to, for example, connect to a surface of the second circuit board 16
Data Source
AI summary
An oven-controlled crystal oscillator includes a base substrate, a power transistor, and a surface mount type crystal resonator. The base substrate has a bottom surface on which a mounting terminal for surface mounting is disposed. The power transistor is mounted on the base substrate. The surface mount type crystal resonator is mounted on the power transistor.