- Crystal Devices
What is Crystal Unit Matching?
In most cases, the ICs you use will function properly when connected to a timing device. There are many different types of timing devices, but when using a crystal unit, appropriate circuit design and matching checks are required. This page will explain how to match a crystal unit.
Crystal Unit Matching
Inappropriate design of the IC and peripheral circuits, including the settings of the load capacitances C1 and C2, the feedback resistance Rf, the damping resistance Rd, and the pattern wiring capacitance, can result in malfunctions.
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What is a Crystal Unit?
A crystal unit is a "passive component" that does not function by itself. It controls various electronic devices by utilizing the piezoelectric phenomenon, in which distortion and vibration occur when voltage is applied to a quartz crystal. In order to convert the mechanical vibrations caused by the piezoelectric phenomenon into an electrical signal and obtain a frequency, an oscillation circuit is required to oscillate the unit and generate a continuous frequency.Click here to learn about clock oscillators that combine a crystal unit and an oscillation circuit.
What Problems or Phenomena Can Result From The Configuration of The Peripheral Circuits?
Influence of peripheral circuits
Relationship between the negative resistance of the circuit and the resonant resistance of the resonator
In the event that the negative resistance of the circuit does not satisfy the following conditions, it may result in the absence of oscillation or the occurrence of abnormal oscillation.
Oscillation start condition: RL* <| -R |
Oscillation steady state: RL*= | -R | *RL: Resonance resistance of the crystal unit under load
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What is Negative Resistance in a Circuit?
An electronic circuit with negative resistance is one in which, in contrast to the standard, the current decreases when the voltage increases. Such a circuit is known as a circuit with "negative resistance". In a crystal oscillator circuit, if there is sufficient negative resistance (-R) to counteract the crystal's resistance, the crystal will continue to oscillate, thereby sustaining the oscillation phenomenon. In summary, the presence of negative resistance negates the crystal's inherent resistance, enabling stable and continuous oscillation.
Influence of peripheral circuit constants
Generally, the influence of the load capacitance and damping resistance of the circuit is as follows. If the settings are not appropriate, the IC you are using may have problems such as "not achieving optimal performance" or "operating abnormally" due to influences such as frequency deviation.
Depending on the circuit design, the frequency or negative resistance may change, potentially causing the device to malfunction. To ensure optimal performance, try utilize Kyocera's circuit matching service to identify the ideal circuit settings.
Introducing Design Support by Circuit Matching Service
Providing Customers with Peace of Mind
To ensure customers can use our timing devices with peace of mind, Kyocera has established technical support centers around the world to provide circuit matching services.
Introducing Design Support by Circuit Matching Service
Benefits
- Stable oscillation with higher gain margin
- Improved start-up time of oscillation
- Quick and flexible design support
The Important Information/Disclaimer is incorporated in the catalog and/or this page by reference and should be reviewed in full before placing any order or inquiry.
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