University of Southern California
University of Southern California
复制标题
DOI：
10.1177/002205741909000509
复制
发表时间：
1919-08
影响因子：
1.3
通讯作者：
Yann D. Staelens
中科院分区：
文献类型：
--
作者：
Yann D. Staelens
宽带模拟和高速数字集成电路必须使用最小几何结构的晶体管，其小击穿电压排除了它们在甚至相对小的时间段内维持大的集电极-发射极（或漏极-源极）电压的能力。为了保护这些器件免受瞬态电压过应力的影响，通常在集成电路的ON/OFF电源线开关和电源焊盘之间插入图（P1）所示形式的二阶LC滤波器。在该电路中，R1表示要向其供电的稳态负载，并且名义上是稳态负载电压与稳态负载电流的比率。因此，如果集成电路的期望静态焊盘电压是3.3伏并且如果该电路要汲取12 mA的静态电流，则R1 = 3.3/12 mA = 275 Ω。滤波器本身由电感Ls和电容C1组成，电感Ls包括与芯片上的电源总线线路布线相关联的任何寄生电感，电容C1包括寄生电源焊盘电容。电阻Rs通常很小，并且包括电源总线损耗和有限电感品质因数（Q）的影响。顺便说一句，你在连接笔记本电脑和电源的电源线上看到的橡胶或塑料涂层的“凸起”就是图（P1）中的电感。指示电压Vp是芯片的Thévenin激励电压，而在时间t = 0闭合的开关允许滤波器输入电压vi（t）模拟阶跃函数Vpu（t）。应当理解，滤波器的基本目的是减慢从测量vi（t）的输入端口到建立电压vo（t）的输出端口的功率输送速率，使得vo（t）随着时间单调地朝向其稳态值上升，而几乎没有或没有电压过冲。
Wideband analog and high-speed digital integrated circuits necessarily use minimal geometry transistors whose small breakdown voltages preclude their capability to sustain large collector-emitter (or drain-source) voltages over even relatively small time periods. To protect these devices from transient voltage overstress, a second order LC filter of the form shown in Fig. (P1) is often inserted between the ON/OFF power line switch and the power supply pad of the integrated circuit. In this circuit, Rl represents the steady state load to which power is to be supplied and is nominally the ratio of the steady state load voltage -tothe steady state load current. Thus, if the desired quiescent pad voltage of an integrated circuit is 3.3 volts and if this circuit is to draw a quiescent current of 12 mA, Rl = 3.3/12 mA = 275 Ω. The filter itself consists of the inductance, Ls, which includes any parasitic inductance associated with the power supply bus line routing on chip, and the capacitance, Cl, which includes parasitic power supply pad capacitance. The resistance, Rs is generally small and includes the effects of power bus losses and finite inductance quality factor (Q). By the way, the rubberized or plastic-coated “bump” you see in the power line that connects your laptop computer to an energy source is the inductance in Fig. (P1). The indicated voltage, Vp is the Thévenin energizing voltage for the chip, while the switch, which is closed at time t = 0, allows the filter input voltage, vi(t), to emulate the step function, Vpu(t). It is to be understood that the fundamental purpose of the filter is to slow the rate of power delivery from the input port, where vi(t) is measured, -tothe output port, where voltage vo(t) is established, so that vo(t) rises monotonically with time toward its steady state value with little or no voltage overshoot.