The quartz crystal oscillator is a high precision and high stability oscillator, is widely used in color television sets, computers, remote control and other types of oscillation circuit, and communication systems for the frequency generator generates the clock for the data processing equipmentsignal and reference signalfor a particular system. The International Electrotechnical Commission (IEC) quartz crystal oscillator is divided into four categories: common crystal oscillator (SPXO), voltage controlled crystal oscillator (VCXO), temperature compensated crystal oscillator (TCXO), thermostatically controlled crystal oscillator (OCXO). The development of digital compensation crystal damage oscillation (DCXO), microcomputer compensated crystal oscillator (MCXO). Etc ......