Several Main Parameters of Temperature Compensated Crystal Oscillator
There are many parameters for temperature-compensated crystal oscillators. In the actual application of temperature-compensated crystal oscillators, in addition to the main parameters such as nominal frequency, PPM accuracy, and temperature stability, some other important parameters need to be paid attention to. When the standard power supply voltage, standard load capacitance impedance, reference temperature, and other conditions remain unchanged, the frequency accuracy of the temperature compensated crystal oscillator can reach more than 0.5PPM.
Fig.1
Keeping other specifications unchanged, the maximum change in the quartz crystal oscillator's output frequency within the specified temperature range is relative to the allowable frequency deviation of the sum of the output frequency extremes within the temperature range, that is, (Fmax-Fmin)/(Fmax Fmin).
By adjusting the variable element of the crystal oscillator to change the range of the output frequency, the frequency modulation (voltage control) characteristics include frequency offset, frequency sensitivity, and frequency linearity. The difference in output frequency when the voltage of a voltage-controlled oscillator changes from its nominal maximum value to its minimum value; the change in output frequency of a voltage-controlled crystal oscillator is caused by the applied control voltage per unit.
1. Frequency accuracy
When the standard power supply voltage, standard load capacitance impedance, reference temperature (25℃), and other conditions remain unchanged, the maximum allowable deviation between the frequency of the quartz crystal oscillator and its specified nominal value should not exceed ±50PPM.
2. Daily fluctuations
Within 24 hours after the specified warm-up time, the oscillator is measured every hour, and the daily fluctuation is obtained by calculating the test data according to the formula S=(fmax-fmin)/f0. Power-on characteristics, the maximum change in the oscillator frequency value within the specified preheating time is represented by V=(fmax-fmin)/f0.
3. Temperature stability
Other specifications and conditions remain unchanged. The maximum change in the output frequency of a quartz crystal oscillator within a specified temperature range is the allowable frequency offset relative to the sum of the extreme values of the output frequencies within the temperature range, that is, (fmax-fmin)/(fmax fmin).
4. Load characteristics
Other conditions remaining unchanged, the maximum allowable frequency deviation of the crystal oscillator output frequency relative to the output frequency under the nominal load is within the specified range. The maximum allowable frequency deviation of the crystal oscillator output frequency relative to the output frequency at the nominal power supply voltage is within the specified range.
5. Phase noise
The frequency domain measure of short-term stability is expressed by the ratio of single sideband noise to carrier noise\u(f), which is directly related to the spectral density S(f) of noise fluctuations and Sy(f) of frequency fluctuations, expressed by the following formula :F2s (f)=F02SY (f)=2F2. F0—carrier frequency. The power ratio of the discrete spectrum components related to the main frequency that does not contain harmonics (except sub-harmonics) in the output signal signal to the main frequency is expressed in dBc.
6. Harmonics
The ratio of component power Pi to carrier power P0 is expressed in dBc. Under specified environmental conditions, the drift process of the system output frequency over time caused by the aging of components (mainly quartz resonators) is parameter data, which is relatively important data.
- |
- +1 赞 0
- 收藏
- 评论 0
本文由三年不鸣转载自YXC News,原文标题为:Several main parameters of temperature compensated crystal oscillator,本站所有转载文章系出于传递更多信息之目的,且明确注明来源,不希望被转载的媒体或个人可与我们联系,我们将立即进行删除处理。
相关推荐
The Crystal Oscillator Startup Time is Too Long, Hardware & Software Can be Optimized Together Like This
The article discusses the reasons why crystal oscillator startup time gets longer and brings up some suggestions to optimize the startup time from software and hardware.
设计经验 发布时间 : 2024-10-18
Temperature Compensated Crystal Oscillator Is Also One of The Quartz Crystal Oscillators, Referred to as “temperature Compensated Crystal Oscillator“
What are the characteristics of temperature compensated crystal oscillator? Because electronic products in different fields have different demands for quartz crystal oscillators, and temperature-compensated crystal oscillators were developed to compensate for the instability of ordinary crystal oscillators at high temperatures. However, temperature-compensated crystal oscillators have There are many types of temperature compensated crystal oscillators, each with its own characteristics.
设计经验 发布时间 : 2024-01-16
How to Gradually Determine The Parameters and Type When Choosing A Quartz Crystal Oscillator
Crystal oscillators are used in more and more communication equipment. With the development of technology, the types of quartz crystal oscillators are also increasing. Therefore, many users are paying attention to how to choose the parameters and type of crystal oscillators. Yangxing will talk to you about three directions to determine your crystal oscillator type.
设计经验 发布时间 : 2024-03-01
Crystal Oscillator PPM Error Analysis and Calculation Method
Crystal oscillator accuracy is usually measured in PPM, which describes the frequency stability or deviation of the crystal oscillator. PPM represents the relative error between the actual output frequency and the nominal frequency, and is an important parameter for measuring the frequency accuracy of the crystal oscillator.
技术探讨 发布时间 : 2024-11-02
YSO110TR OT2JI-111-32.768M SMD-3225-32.768MHZ-1.8V-3.3V- ±10PPM石英晶体振荡器产品规格书(YSO110TR OT2JI-111-32.768M SMD-3225-32.768MHZ-1.8V-3.3V- ±10PPM QUARTZ CRYSTAL OSCILLATOR SPECIFICATION)
型号- OT2JI-111-32.768M,YSO110TR 32.76800MHZ 1.8V-3.3V ±10PPM,YSO110TR
YSO210PR OA1EIB112-148.5M 石英晶体振荡器 产品规格书
型号- OA1EIB112-148.5M,YSO210PR 148.50000MHZ 3.3V -/+20PPM,YSO210PR
What Does 30pf Mean for a Crystal Oscillator?
30PF for a crystal oscillator refers to an external capacitor of 30PF. The choice of capacitance can directly affect the start-up time, output frequency accuracy and frequency stability of a passive crystal oscillator.
技术探讨 发布时间 : 2024-10-26
YXC Programmable Differential Crystal Oscillator YSO210PR Series, Frequency 155.52MHz, LVPECL Output, Used in Switches
A switch is a network device that is mainly used for forwarding electrical (optical) signals, allowing independent communication between any two network nodes connected to the switch.Switches are not limited to Ethernet applications, but also come in many forms such as telephone voice switches and fiber optic switches to meet different network needs.Switches require a stable clock signal to synchronize the transmission and processing of network data.
应用方案 发布时间 : 2024-06-22
YXC automotive grade resonator 8MHz, Passive Crystal Oscillator 3225 Package for Car Bluetooth Module
Bluetooth module is a PCBA board with integrated Bluetooth function, which is used for short-distance wireless communication. It is divided into Bluetooth data module and Bluetooth voice module according to its function. Bluetooth module refers to a collection of basic circuits of chips with integrated Bluetooth function, which is used for wireless network communication.
产品 发布时间 : 2024-06-23
YSO110TR OT2JI-111-12.288M 石英晶体振荡器 产品规格书
型号- YSO110TR 12.288MHZ 1.8V-3.3V -/+10PPM,OT2JI-111-12.288M,YSO110TR
电子商城
现货市场
服务
测试范围:扬兴晶振全系列晶体,通过对晶体回路匹配分析,调整频率、驱动功率和起振能力,解决频偏、不起振、干扰、频率错误等问题。技术专家免费分析,测完如有问题,会进一步晶振烧录/修改电路。
实验室地址: 深圳 提交需求>
登录 | 立即注册
提交评论