石英晶体谐振器分析与设计基础 - 宁波大学压电器件实验室.ppt

* * * * * * * * * * * * * * * * * * * * * * * * Oct 7, 2009 New outlines * * * * * * * * * * * * * * * * * * * * * * Oct 7, 2009 New outlines * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * Oct 7, 2009 New outlines * * * * * * * * * * * * * * * * * Oct 7, 2009 New outlines * * 2.Main Charcteristics of Quartz rystal Resonator: Calibration tolerance; Frequency temerature property; Equivalent resistance, Mechanical characteristics, Weather resistant Property,...etc. 3. Frequency Temprature Property: Although the frequecy of the resonator is stable, it is also slightly influenced by temperature change. That is, quartz crystal resonator has the charcteristic that the frequency changes itself because of the change of temperature.The frequency temperature property is indicated by temperature frequency tolerance. 4. Temperature Stability Tolerance: Under definite conditions, the maximum deviation of the working frequency in a definite temperature range subject to the working frequency at standand temperature. 5. Calibration Tolerance: Under definite conditions, the maximum deviation of the working frequency at standard temperature subject to nominal frequency. 6.Total Frequecncy Tolerance: Under definite conditions,the maximum deviation of the working frequecy in the working frequency range subject to nominal frequecy. 7.Standard Temperature: The definite temperature of environment when measuring parameters of quartz crystal resonator.For constant temperature resonator, it is the central temperature of working temperature range.For non-constant temperature resonator is +25±2°C. 8.Working Temperature: A temperature range of enviroment, in which the characteristics of quartz crystal resonator can meet the technical requirements. 9.Resonance Resistance: Under definite conditions, in which the characteristics of quartz crystal resonator at resonant frequency. Generally it is approximately equal to the dynamic resistance R1. 10.Load Resonance Resistance: Under defini