There are hundreds of frequency components. Take the familiar crystal oscillator, also known as crystal oscillator.
The function of crystal oscillator is to form an oscillation circuit with clock chip, MCU or computer sound card and graphics card. It is an important signal generation source in digital circuit and is used to generate clock signals. Crystal oscillator in digital circuit is like a gear or chain in mechanical system, which is used to drive other digital circuits to work in harmony.
The main frequency of the computer refers to the frequency of the clock signal generated by the crystal oscillator Crystal oscillators are usually divided into ceramic crystal oscillators and quartz crystal oscillators. Now in recent years, the use of quartz crystal oscillators is much larger than that of ceramic crystal oscillators in 2015. In addition to its accuracy and stability higher than that of ceramic crystal oscillators, there are many varieties of quartz crystal oscillators with stable performance.
In the circuit board, the symbol of crystal oscillator is usually represented by "X" or "Y", and the unit is Hz. Hz is Hz, and the frequency unit is 1MHz (MHz) =1000khz (kHz) =1000000hz. The two common frequency units of crystal oscillator are kHz and MHz.
The common frequency in kHz is 32.768KHz, while the common frequency in MHz is more. For example, 4MHz, 8MHz, 10MHz, 12Mhz, 14.318mhz, 25MHz, 26MHz and other frequency points.
Take the computer as an example, the crystal oscillator on the motherboard is mainly divided into: (1) clock crystal oscillator: the frequency connected with the clock chip is 14.318mhz, and the working voltage is 1.1-1.6v; (2) real time crystal oscillator: the frequency connected with Nanqiao is 32.768mhz, and the working voltage is about 0.4V; (3) sound card crystal oscillator: the frequency connected with the sound card chip is 24.576mhz; (4) network card crystal oscillator: the frequency connected with the network card chip is 25.000mhz
Japanese brand crystal oscillator has been widely recognized in China, such as Epson crystal oscillator, NDK crystal oscillator of Nippon Electric Co., Ltd. and KDS crystal oscillator of Japan. CTS crystal oscillator in the United States. Taiwan's first-line brands TXC Jingzhen, Hongxing Jingzhen, etc