Oscillator Thermal Control via Dual Temperature Controllers
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Solution Overview
Problem
Existing oscillators, such as oven-controlled crystal oscillators (OCXO), face inefficiencies in heating the circuit element due to a long heat transfer path from the heater to the circuit, making them susceptible to external temperature fluctuations.
Innovation Solution
The oscillator design includes a first and second temperature controller positioned to efficiently heat the circuit element, with the circuit element disposed between them, and additional heating elements in a second package to ensure even and stable temperature control, reducing the impact of external temperature fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the circuit element is fixed to the package without the intervention of the mount plate, then the device complexity is reduced, but the heat transfer path becomes long and heating efficiency deteriorates
Solution Approach 1:
The patent extracts the mount plate from the heating path between the heater and circuit element, allowing the circuit element to be fixed directly to the package. This eliminates the thermal resistance introduced by the mount plate while maintaining structural simplicity.
Solution Approach 2:
The patent segments the package structure into distinct functional zones: a heater mounting area with direct thermal contact to the package, and a circuit element mounting area also with direct thermal contact. This segmentation allows optimized thermal paths for each component without requiring a common mount plate.
2Adaptability or versatility
If the heater is positioned far from the circuit element, then the layout flexibility is improved, but the heating efficiency deteriorates due to long heat transfer path
Solution Approach 1:
The patent utilizes the third dimension (vertical depth within the package) to position the heater and circuit element in close proximity for efficient heat transfer, while the planar layout remains flexible. The heater can be mounted on the package bottom surface, heating the circuit element from below through the package substrate.
Solution Approach 2:
The patent creates a localized high-thermal-conductivity region between the heater and circuit element by fixing both directly to the package body. This local quality enhancement ensures efficient heat transfer at the critical interface while maintaining overall layout flexibility.
3Device complexity
If the circuit element is not evenly heated by the temperature controllers, then the device complexity is reduced, but the temperature stability deteriorates
Solution Approach 1:
The patent employs asymmetric positioning of multiple temperature controllers around the circuit element, with each controller strategically placed to compensate for specific heat loss paths. This asymmetric arrangement achieves uniform temperature distribution without requiring symmetric, complex control structures.
Solution Approach 2:
The patent optimizes the thermal parameters of the package structure, including thermal conductivity of mounting regions and heat capacity distribution, to enable even heat distribution from the temperature controllers. By adjusting these parameters, the system achieves temperature uniformity with simpler control architecture.
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 efficient and stable heating of the circuit element, reducing temperature variations and enhancing the oscillator's reliability by ensuring consistent frequency stability.
Implementation Method 1
a first temperature controller and a second temperature controller housed in the first package, and mounted on the first base... By disposing the circuit element between the first temperature controller and the second temperature controller as described above, it is possible to efficiently heat the circuit element
Implementation Method 2
The packages are airtightly sealed and maintained in a reduced-pressure state to minimize external temperature influences
Data Source
AI summary
An oscillator includes a first package including a first base, and a first lid bonded to the first base, a first temperature controller housed in the first package, and mounted on the first base, a second temperature controller housed in the first package, and mounted on the first base, and a circuit element housed in the first package, mounted on the first base, and including at least a part of an oscillation circuit, the circuit element is disposed between the first temperature controller and the second temperature controller in a planar view.