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  • 3.2 x 1.5mm SMD Tuning Fork Crystal

    SMD Tuning Fork Crystal PSX315 Features 3215 Size Miniature And Fork Crystal Resonator With A Low Profile Pf 0.75mm. A Ceramic Package Providing High Precision And Reliability. Metal Lid Connected To GND Terminal To Reduce EMI. Noise Resistance Application (Smart Meter Etc.) series resistance 50KΩ max available. AEC-Q200 Compliant Applications Mobile Communications, PDA, Wave Clock, Digital Appliance Auto Motive Applications Such As Multimedia Device More

  • 6.9x1.4mm SMD Tuning Fork Crystal

    SMD Tuning Fork Crystal PMX145 Features Ultra Miniature SMD Tuning Fork Crystal Resonator Plastic molded SMD tuning fork crystal of heat-resistance Metal Lid Connected To GND Terminal To Reduce EMI Suitable For Mobile Communications And Consumer Devices. Applications Mobile Communications And Consumer Devices, Etc. Smart Card And Wearable Devices More

  • 8.0x3.2mm SMD Tuning Fork Crystal

    SMD Tuning Fork Crystal PMX206 Features Ultra Miniature SMD Tuning Fork Crystal Resonator Plastic molded SMD tuning fork crystal of heat-resistance Metal Lid Connected To GND Terminal To Reduce EMI Suitable For Mobile Communications And Consumer Devices. Applications Mobile Communications And Consumer Devices, Etc. Smart Card And Wearable Devices More

  • 9.6x4.0mm SMD Tuning Fork Crystal

    SMD Tuning Fork Crystal PMX405 Features Ultra Miniature SMD Tuning Fork Crystal Resonator Plastic molded SMD tuning fork crystal of heat-resistance Metal Lid Connected To GND Terminal To Reduce EMI Suitable For Mobile Communications And Consumer Devices. Applications Mobile Communications And Consumer Devices, Etc. Smart Card And Wearable Devices More

  • 2.0x6.0mm SMD Tuning Fork Crystal

    SMD Tuning Fork Crystal PMX206F Features Ultra Miniature SMD Tuning Fork Crystal Resonator SMD tuning fork crystal of lead formed heat-resistance Metal Lid Connected To GND Terminal To Reduce EMI Suitable For Mobile Communications And Consumer Devices. Applications Mobile Communications And Consumer Devices, Etc. Smart Card And Wearable Devices More

  • 2.0x6.0mm SMD Tuning Fork Crystal

    SMD Tuning Fork Crystal PMX206FA Features Ultra Miniature SMD Tuning Fork Crystal Resonator SMD Tuning Fork Crystal Of Lead Formed Heat-Resistance Metal Lid Connected To GND Terminal To Reduce EMI Suitable For Mobile Communications And Consumer Devices. Applications Mobile Communications And Consumer Devices, Etc. Smart Card And Wearable Devices More

  • 2.0x6.0mm DIP Tuning Fork Crystal

    DIP Tuning Fork Crystal DT206 Features: A Cylindrical Type Tuning Fork Crystal Resonator Low Power Consuming Tuning Fork Crystal Resonators Are Suitable Not Only For Wristwatches But Also For A Wide Range Of Other Applications From Industrial Equipment To Other The Clock Functions In Consumer And Household Electronics. Applications: Mobile Communications And Consumer Devices, Etc. Smart Card And Wearable Devices More

  • 1.6 x 1.2 x 0.4mm SMD Quartz Crystal

    SMD Quartz Crystal P1SB Features 1612 size ultra miniature and lightweight SMD crystal resonator with a low profile of 0.35mm High precision and high reliability (Frequency aging specification of ±1x10 -6/1 year or ±3x10-6 / 5 year are available for cell phone or wireless communications systems etc. ) Allowing for high density surface mounting. Applications Small mobile devices for next generation like mobile communications short-range wireless modules, digital AV equipment and PC. Wearable devices More

  • How to Test the values of Q on Resonator oscillator & Quartz Crystal
    How to Test the values of Q on Resonator oscillator & Quartz Crystal
    • Dec 29, 2020

    Values of Q test and the relationship between Qo & the size of cavities For the cavity filter used in the field of modern mobile communication base stations, the insertion loss is one of the essential RF key indicators. We often expect the smaller the loss, the better: if the insertion loss of the filter can be effectively reduced, it will be of great benefit to the realization of other indicators of the filter or to the entire mobile base station system. The development of modern mobile communications, especially 5G micro base stations, requires the size of filters to become smaller and smaller, which will inevitably bring about the reduction of the unloaded Q value of a single cavity. Therefore, how to effectively use the limited cavity volume and allocate the Q value has become the key to the filter insertion loss. The designers of most filter design companies design a single cavity with almost the same size for each channel. In fact, the reasonable layout of the size of each single cavity can reduce the insertion loss of the filter, increase the insertion loss margin of the product, and even make the product of the customer index that cannot be achieved in the first place, thereby meeting customer requirements. 1. The relationship between Q value and single cavity size The Q value is a measure of the average energy storage and loss of the resonant tank. Large energy storage and small loss means high Q value. The Q value is related to the volume and surface area of a single cavity. The larger the volume, the greater the electromagnetic energy stored in the single cavity. The smaller the surface area, the smaller the loss of the single cavity, and the greater the Q value, and vice versa. Here we share some reference values of filter single cavity (including circular cavity and square cavity) of different sizes and corresponding Q values of each frequency band. For your reference and reference when designing. AMPS AMPS GSM GSM Cavity size(mm) F0(RX) 836MHz Q0 F0(TX) 881MHz Q0 F0(RX) 902MHz Q0 F0(TX) 948MHz Q0 F0 1530MHz Q0 20 1280 1310 1330 1360 1730 25 1600 1640 1660 1700 2160 30 1910 1970 1990 2040 9590 35 2230 2306 2330 2360 3020 40 2550 2630 2660 2720 3450 45 2870 2950 2990 3060 3880 50 3190 3280 3300 3400 4310 55 3500 3610 3650 3740 4740 DCS DCS PCS PCS UMTS Cavity size(mm) F0(RX) 1747MHz Q0 F0(TX) 1842MHz Q0 F0(RX) 1880MHz Q0 F0(TX) 1960MHz Q0 F0 2140MHz Q0 20 1850 1900 1920 1960 2040 25 2310 2370 2390 2440 2550 30 2770 2840 2870 2930 3060 35 3230 3310 3350 3420 3570 40 3690 3780 3820 3900 4070 45 4140 4250 4200 4380 4580 50 4600 4720 4770 4870 5080 55 5050 5190 5240 5350 5580 AMPS AMPS GSM GSM Square cavity size(mm) F0(RX) 836MHz Q0 F0(TX) 881MHz Q0 F0(RX) 902MHz Q0 F0(TX) 948MHz Q0 F0 1530MHz Q0 20×20 1530 1580 1600 1640 2080 25×25 1910 1970 2000 2040 2600 30×30 2300 2360 2390 2450 3110 35×35 2680 2760 2790 2860 3630 40×40 3060 3150 3190 3270 4140 45×45 3440 3540 3590 3600 4660 50×50 3820 3940 3990 4080 5170 55×55 4200 4330 4380...

  • The Solutions & Reasons for Making the Crystal Oscillator Working
    The Solutions & Reasons for Making the Crystal Oscillator Working
    • Jun 14, 2019

    The importance of a crystal is equal to the heart of mankind. The crystal oscillator in the motherboard suddenly does not work, it is really anxious, the crystal oscillator is usually stopped for what reason. Crystal oscillator can not solve the solution: 1, the material parameter selection error causes the crystal to not vibrate This problem occurs more in the load capacitance of the crystal, why is the load capacitance easy to make a mistake? In the use of passive crystal oscillators, the external components usually need external capacitors and other components, so that the passive crystal oscillator can normally start to work for the IC. Here, we need to note that the unit of the external capacitor is also PF, and the load capacitance unit of the crystal oscillator is also PF. When the supplier asks about the load capacitance, it is easy to confuse the parameters of the two, so the parameters are not Matching will naturally cause the crystal oscillator to not start properly, or the frequency accuracy will be biased, and it will easily stop the vibration when the crystal oscillator performance is stable. 2, the internal wafer is broken or damaged, resulting in no vibration This problem occurs mostly in cylindrical crystal oscillators, 49/S crystal oscillators, ceramic plug-in crystal oscillators, etc. Therefore, the series of crystal oscillators have no fixed braids, and they are all packaged in transparent bags. It is easy to be damaged during transportation, or the wafers inside the crystals are damaged due to factors such as falling and impact during use, resulting in the crystals not vibrating. 3, the oscillation circuit does not match, causing the crystal to not vibrate Three indicators affecting the oscillation circuit: frequency error, negative impedance, and excitation level. The frequency error is too large, causing the actual frequency to shift to the nominal frequency and causing the crystal to not vibrate. This is also a lot of purchases do not understand, the same frequency, the same package of crystal oscillators will have different unit prices, because the higher the accuracy of the crystal oscillator, which means the better product performance. Do not blindly pursue the price of crystal oscillators, and ignore the quality of crystal oscillators! Solution: Choose the right PPM value for the product. Negative impedance If the negative impedance is too large or too small, the crystal will not vibrate. Solution: If the negative impedance is too large, the value of the crystal external capacitors Cd and Cg can be increased to reduce the negative impedance. If the negative impedance is too small, the values of the external capacitors Cd and Cg can be adjusted to increase the negative. Sexual impedance. In general, the negative impedance value should satisfy not less than 3-5 times the nominal maximum impedance of the crystal. Excitation level If the excitation level is too large or too small, the crystal will not vibrate. Solution: Ad...

  • Micro Precision Clock Crystal for Wireless Communication Solutions
    Micro Precision Clock Crystal for Wireless Communication Solutions
    • Jun 14, 2019

    The crystal oscillator is the most important component of the clock circuit. It can provide the standard time for timing control. In wireless communication equipment, the accuracy of the crystal oscillator and the stability of the operating frequency directly determine the reliability of the communication product. The main products include: passive crystal, active crystal oscillator, TCXO, VCXO, SAW oscillator, etc. The frequency coverage ranges from KHz to GHz. In recent years, with the widespread use of Bluetooth technology and WiFi technology, its market share in the field of wireless communication has become more and more significant, especially the emergence of smart phones and tablets, and the use of various devices has increased, and in the device. Most of them have wireless communication functions, and an important device for realizing wireless communication connection is the crystal oscillator module. With the concept of smart wear, the demand for micro-precision clock crystal oscillators is becoming more and more obvious. According to the new wireless communication application, A-Crystal has introduced some high-precision crystal oscillator products with small size, low thickness and high cost performance, which can well meet the application requirements of various wireless communication modules for clock crystal. Features: 1. High precision 2. Can adapt to harsh industrial application temperature environment 3. Small size package for small portable communication devices Application industry: Smartphone 2. Bluetooth, WLAN 3. Microprocessor 4. GPS field 5. Telecommunications industry

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