Oscillator Terminal Switching for Stable Resonator Testing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing surface mounting oscillators face operation failures due to unintended variations in power supply voltage causing coupling issues between functional and output terminals of the quartz crystal blank, leading to potential operation failures.
Innovation Solution
A circuit device with switches and a register that control the coupling of terminals to the resonator, allowing for a normal operation mode and a test mode, where switches are turned off or on to isolate terminals for stable operation and testing respectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the first switching circuit and the second switching circuit are provided to couple output terminal and functional terminal to excitation electrodes of quartz crystal blank, then miniaturization is promoted by using mounting terminal as quartz crystal test terminal, but operation failure may occur due to unintended variation in power supply voltage causing incorrect coupling during normal operation
Solution Approach 1:
The patent applies preliminary action by detecting the power supply voltage before switching operations and preparing the appropriate switching state in advance. The voltage detection circuit measures the power supply voltage, and based on the detected voltage level, the switching circuit is configured to either couple or decouple the output terminal and functional terminal from the excitation electrodes, preventing operation failures before they occur.
Solution Approach 2:
The patent implements feedback through a voltage detection circuit that continuously monitors the power supply voltage and provides feedback to control the switching circuits. This feedback mechanism ensures that the switching state (coupled or decoupled) is adjusted according to the actual power supply voltage conditions, maintaining reliable operation while enabling miniaturization.
2Device complexity
If mounting terminal is used as quartz crystal test terminal to promote miniaturization, then the number of terminals is reduced, but the functional terminal and output terminal may be incorrectly coupled to excitation electrodes during normal operation
Solution Approach 1:
The patent applies dynamics by making the terminal coupling state changeable rather than fixed. Switching circuits are introduced to dynamically connect or disconnect the output terminal and functional terminal from the excitation electrodes based on operating mode (normal operation vs. testing). This dynamic configuration allows the same physical terminals to serve different functions depending on the required operation mode.
Solution Approach 2:
The patent uses switching circuits as intermediary elements between the terminals and the excitation electrodes. These switching circuits act as mediators that can selectively connect or disconnect the terminals from the excitation electrodes, ensuring that the correct terminals are coupled only when required for testing, while preventing incorrect coupling during normal operation.
Data Source
AI summary
A circuit device includes: a first terminal and a second terminal coupled to a resonator; a third terminal; a fourth terminal; a first switch provided on a signal path between the first terminal and the third terminal; a second switch provided on a signal path between the second terminal and the fourth terminal; and a register configured to output a signal for controlling the first switch and the second switch to be turned on or off. In a first mode, the first switch and the second switch are turned off, a control signal is input to the third terminal, and a clock signal is output from the fourth terminal. In a second mode, the first switch and the second switch are turned on.