PCB-Spaced Oscillator Structure for Frequency Stability Under Heat
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Solution Overview
Problem
Quartz oscillators in electronic devices are vulnerable to temperature changes, leading to frequency instability, especially in small-sized devices that cannot easily dissipate heat, limiting temperature compensation effectiveness.
Innovation Solution
An electronic device with an oscillator structure that includes a piezoelectric material and a connection member with conductive patterns to space the oscillator apart from the printed circuit board, enhancing thermal capacity and reducing temperature-induced frequency changes through a conductive pattern and pad configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the oscillator is mounted directly on the printed circuit board, then the electrical connection is simple, but the temperature changes severely causing frequency instability
Solution Approach 1:
A connection member is introduced as an intermediary component between the oscillator and the printed circuit board. This connection member includes a first pad part connected to the oscillator terminal, a second pad part connected to the PCB pad, and conductive patterns that electrically connect these pad parts. The intermediary structure allows thermal isolation while maintaining electrical connectivity, thereby resolving the contradiction between frequency stability and connection simplicity.
2Measurement precision
If temperature compensation elements are added to the quartz oscillator, then the temperature measurement capability is improved, but the device size increases and heat dissipation becomes difficult
Solution Approach 1:
The temperature compensation function is extracted from the oscillator housing and implemented separately on the printed circuit board. The temperature compensation element is mounted on the PCB rather than being integrated into the oscillator body, allowing the oscillator to remain compact while still providing temperature measurement capability through the separate compensation element and associated circuitry.
3Temperature
If the oscillator is spaced apart from the printed circuit board, then the thermal capacity is increased reducing temperature-induced frequency changes, but the electrical connection becomes more complex
Solution Approach 1:
The connection member serves as a mediator that enables both thermal isolation and electrical connectivity. By spacing the oscillator apart from the PCB and using the connection member with its conductive patterns, the system increases thermal capacity to reduce temperature-induced frequency changes while maintaining manageable electrical connection complexity through the structured pad and conductive pattern design.
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 reduces the magnitude of temperature changes in the oscillator, improving frequency stability and precision by increasing thermal capacity and maintaining efficient electrical connectivity.
Implementation Method 1
The quartz oscillator uses a piezoelectric effect of quartz pieces. If an alternating current (AC) voltage is applied to a quartz piece cut in a specific direction with respect to an axis of a quartz crystal, vibration is caused by a deformation force due to a piezoelectric phenomenon.
Implementation Method 2
a connection member disposed between the oscillator and the printed circuit board such that the oscillator is spaced apart from a surface of the printed circuit board to electrically connect the oscillator to the printed circuit board
Data Source
AI summary
An electronic device and oscillator structure are provided. The electronic device includes a printed circuit board, an oscillator configured to oscillate at a frequency corresponding to an operation clock of the electronic device, and a connection member disposed between the oscillator and the printed circuit board such that the oscillator is spaced apart from a surface of the printed circuit board to electrically connect the oscillator to the printed circuit board. The connection member includes a first pad part electrically connected to a terminal of the oscillator, a second pad part electrically connected to a pad of the printed circuit board, and at least one conductive pattern electrically connecting the first pad part and the second pad part.