Oscillation Circuit Overdrive for Compact Resonator Packages
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Solution Overview
Problem
Miniaturization of oscillation devices and circuit packages makes it difficult to perform overdrive tests on resonators, such as quartz crystal resonators, due to challenges in providing overdriving electrodes and maintaining stable oscillation frequencies when foreign matter is present.
Innovation Solution
A circuit device configuration that includes an oscillation circuit, a current supply circuit, and a control section, which allows for increased drive power during overdrive mode by using a higher oscillation current or switching to a higher power supply voltage, enabling effective overdrive of the resonator even in compact package structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the package structure is miniaturized to reduce device size, then the device becomes more compact and portable, but it becomes difficult to provide overdriving electrodes and perform overdrive tests on the resonator
Solution Approach 1:
The oscillation circuit's drive electrodes are designed to serve dual purposes: normal oscillation driving and overdrive testing. By controlling the drive power level, the same electrodes can perform both functions, eliminating the need for separate overdriving electrodes and maintaining test capability in miniaturized packages
Solution Approach 2:
The oscillation circuit itself provides the overdrive function by increasing its drive power, without requiring external overdriving electrodes or separate testing equipment. The circuit serves its own testing needs through its existing components
2Reliability
If overdrive is performed on the resonator to remove foreign matter, then the oscillation frequency stability improves, but it requires higher drive power than normal operation
Solution Approach 1:
The drive power of the oscillation circuit is made dynamic and adjustable. The control section can vary the drive power level based on operational needs, enabling high power for overdrive testing to remove foreign matter and low power for normal stable oscillation, thus resolving the contradiction between reliability improvement and power consumption
3Reliability
If the oscillation circuit drives the resonator with higher drive power to perform overdrive, then foreign matter can be removed and frequency stability improves, but the circuit elements must handle increased power stress
Solution Approach 1:
Overdrive operation is implemented as a periodic or intermittent action rather than continuous operation. The control section enables high drive power only when needed for overdrive testing or specific conditions, allowing circuit elements to recover during normal low-power operation, thus managing power stress while achieving frequency stability
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
Enables efficient overdrive of resonators within compact package structures, stabilizing oscillation frequencies and improving reliability by utilizing existing circuit elements to increase drive power and remove foreign matter, thus maintaining quality and yield.
Implementation Method 1
an oscillation circuit (10) having an oscillation transistor (BT) for a resonator (XTAL), and driving the resonator (XTAL) with the oscillation transistor (BT) based on oscillation current
Data Source
AI summary
A circuit device includes a current supply circuit adapted to supply an oscillation current, an oscillation circuit having an oscillation transistor for a resonator, and adapted to drive the resonator using the oscillation transistor based on an oscillation current from the current supply circuit, and a control section adapted to control the current supply circuit. If the oscillation circuit is set to an overdrive mode, the oscillation circuit drives the resonator with a higher drive power than the drive power in a normal mode.