SiP协调设计和PI解析(6)

• 作 者: 蔡积庆
• 出 处: 印制电路信息
• 发表日期: 2012年12期
• 关键词: 信号频率 电容 电容元件 电抗 串联连接 元件 Capacitor 成比例 旁路电容 阻抗

(接上期)但是以芯片电容为主的实际电容元件本身具有小的L或者R成分。这些L或者R成分相对于本来的电容C系统因为表现出等效串联连接的性质,所以称为等效串联(连接)L(ESL=Equivalent Serial L)和等效串联(连接)R(ESL=Equivalent Serial R),如图32所示。图33表示了理想电容C电抗XC与信号频率的关系,而图34表示了实际电容C的特性。由图34可知,当信号频率低时电容C表现出理想电容的特性,但是如果信号频率提高,元件具有的小的ESL的电抗XL就会变大,电容C的阻抗与信号频率就会成比例的提高。

(Continued) However, the actual capacitance element mainly composed of chip capacitors has a small L or R component. These L or R components are called Equivalent Serial L (ESL) and Equivalent Serial L (ESL = Equivalent Serial L) because they exhibit the equivalent series-connected nature with respect to the original capacitance C system. Equivalent Serial R), as shown in Figure 32. Figure 33 shows the ideal capacitor C reactance XC versus signal frequency and Figure 34 shows the actual capacitor C characteristics. As can be seen from Figure 34, capacitor C exhibits an ideal capacitance when the signal frequency is low, but if the signal frequency is increased, the element has a small ESL reactance XL that increases, and the impedance of capacitor C is proportional to the signal frequency Improve.