Bead is used to absorb the high frequency signal, as some RF circuits, PLL, oscillator circuits, including ultra high frequency memory circuit (DDR SDRAM, RAMBUS, etc.) need to increase the power input part of the bead, while the inductor is a store to components used in the LC oscillator circuit, the low frequency filter circuit, the application frequency range rarely exceeds 50MHZ.
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It makes use of digital pulse IC circuits to replace the old transistor oscillator circuits and has great improvement in stability, security and convenience.
它采用数字脉冲集成电路取代早先的晶体管震荡电路，性能更稳定，操作更安全、方便。
Single frequency source is usually used as local oscillator in communication system and radar system, also as a reference clock in digital circuits, so it is a extensive-applied technique.
固定频率源可以在在通讯系统和雷达系统中作为本机振荡器，也可以作为数字电路的基准时钟信号，因此得到了广泛的应用。
A popular ASIC on PWM is analyzed in this paper. The oscillator, most important part of the circuit, and the new design on base of these circuits analysis are discussed.
分析了当今在PWM方面应用比较流行的一款芯片的主要工作原理，讨论了芯片是重要部分电路的具体电路图以及在此基础上进行的重新设计。
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