J W T

Home

·Glossary of Term	·Quartz Crystal Units	·Quartz Crystal	·Quartz Crystal	·Quartz Crystal
·Columniform Crystal Resonator	·Crystal Clock Oscillator	·Voltage Control Crystal Clock Oscillator	·SMD Quartz Crystal	·SMD Crystal Oscillator
·SMD VCXO	·Tapping and Soldering	·CRA Series of Ceramic Resonator

·Glossary of Term·
Frequency-Temperature Characteristics	Fig.1 AT-cut frequency-temperature characteristics
Fig.1 shows the frequency-temperature characteristics for a thickness-shear mode AT-cut crystals with the angle of cut as a parameter. Since the AT-cut frequency- temperature characteristic is equivalent to an equation of the third degree, it displays excellent frequency stability over a wide temperatuer range.

Equivalent Circuit Parameters	Fig.2 The equivalent circuit of a crystal
Figure 2, The equivalent circu, it of crystal, as illustrated, is useful to describe the operation characteristics of crystal near resonance frequency. Co represents the static ( shut ) capacitance and is the sum of the capacitance between the two electrodes and the capacitance brought by the wire leads and holder. The R1, Lland C1 consists of the motional arm of crystal's equivalent circuit. C1 represents the motional capacitance of the quartz, L1 is a motional induction and R1 is a motional resistance.