Crystal oscillator development trend
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1, miniaturization, thinning and slice: In order to meet the requirements of lightweight, thin, and short portable products represented by mobile phones, the quartz crystal oscillator package is transformed from the traditional bare metal outer covering plastic metal to the ceramic package. For example, devices such as TCXO are 30 to 100 times smaller in size. The thickness of TCXOs in SMD packages is less than 2mm, and current 5x3mm devices are available.
2, high precision and high stability, the total accuracy of uncompensated crystal oscillator can reach ± 25ppm, VCXO frequency stability in the range of 10 ~ 7 °C generally reach ± 20 ~ 100ppm, while the OCXO in the same temperature range Frequency stability is generally ± 0.0001 ~ 5ppm, VCXO control in ± 25ppm or less.
3, low noise, high frequency, in the GPS communication system is not allowed to shake frequency, phase noise is an important parameter to characterize oscillator frequency jitter. The phase noise performance of mainstream OCXO products has greatly improved. With the exception of VCXO, the maximum output frequency of other types of crystal oscillators does not exceed 200 MHz. For example, the UCV4 series voltage controlled oscillator for mobile phones such as GSM has a frequency of 650 to 1700 MHz, a power supply voltage of 2.2 to 3.3 V, and an operating current of 8 to 10 mA.
4. Low power consumption, fast start-up, low-voltage operation, low-level drive and low current consumption have become a trend. The supply voltage is generally 3.3V. For many TCXO and VCXO products, the current consumption does not exceed 2 mA. The quartz crystal oscillator's rapid start technology has also made breakthrough progress. For example, VG-2320SC VCXO manufactured by Seiko Co., Ltd. has a frequency stability time of less than 4ms under a ±0.1ppm specified value range. The SMDTCXO produced by Tokyo Ceramics Co., Ltd. in Japan can reach 90% of the rated value after 4ms of oscillation start. OAK's 10 to 25 MHz OCXO products achieve ±0.01ppm stability after preheating for 5 minutes.
The above is Shenzhen oscillator manufacturers, Shenzhen tuning fork Jingzhen manufacturers Xiaobian to you finishing information.
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