1. Miniaturization, thinning and flake: in order to meet the light, thin and short requirements of portable products represented by mobile phones, the encapsulation of quartz crystal oscillator is transformed from the traditional bare metal shell to the ceramic package. For example, the size of TCXO devices has been reduced by 30~100 times. The thickness of TCXO packaged in SMD is less than 2mm. At present, 5 x 3mm size devices have been listed. Crystal oscillator
2. High precision and high stability, the total precision of non compensatory crystal vibration can also reach + 25ppm. The frequency stability of VCXO is generally up to + 20 ~ 100ppm within the range of 10~7 C, and the frequency stability of OCXO is generally within the range of + 0.0001 ~ 5ppm in the same temperature range, and VCXO control is below + 25ppm. Crystal oscillator
3. Low noise and high frequency are not allowed to tremble in the GPS communication system. Phase noise is an important parameter to characterize the frequency tremor of the oscillator. The phase noise performance of OCXO mainstream products has been greatly improved. Except for VCXO, the maximum output frequency of other types of crystal oscillator is not more than 200MHz. For example, the UCV4 series voltage controlled oscillator for mobile phones such as GSM has a frequency of 650 to 1700MHz, a power supply voltage of 2.2 to 3.3V, and a working current of 8 to 10mA. Crystal oscillator
4, low power consumption, fast start up, low voltage operation, low level drive and low current consumption have become a trend. The power supply voltage is generally 3.3V. For many TCXO and VCXO products, the current loss is not more than 2mA. The rapid start-up technology of quartz crystal oscillator has also made breakthrough progress. For example, the VG - 2320SC VCXO produced by Seiko in Japan, under the condition of the value range of + 0.1ppm, the frequency stability time is less than 4ms. The SMDTCXO produced by Tokyo ceramic company in Japan can reach 90% of the rated value after the oscillation starts 4ms. OAK company's 10 to 25MHz OCXO products, after preheating for 5 minutes, can achieve the stability of + 0.01ppm. Crystal oscillator