1 NAT
masquerade: [ˌmæskəˈred]: iptabels 目标, 伪装程序, NAT的实现;
NAT: 网络地址转换, 用于实现多机共享上网;
alias : [`eilies], 别名
Packet Shaping
Packet shaping, often known as traffic shaping or bandwidth throttling, is a method by which users of high bandwidth computer networks can monitor and control the flow of data into and out of the network portals.
Packet shaping: 数据包×××;
traffic shaping: 流量×××;
bandwidth throttling: 带宽限制
Candece SPB: PCB开发套件 = orCad + allegro ;
design entry CIS : 原理图编辑器, orCad CIS;
allegro : PCB editor,
Allegro PCB SI : signal integrity, 开发高速板, 集成仿真工具.
Allegro PCB SI is an integrated design and analysis environment for electrical engineers who create high-speed digital printed circuit boards and systems. It allows you to explore and resolve electrical performance related issues at all stages of the design cycle.
CAD : Computer-aided design
CAE: computer-aided engineering
ECAD : electronic CAD
EDA : electronic design automation
CAM : computer-aided manufacturing
FR4 : a fiberglass/epoxy laminate.(玻璃纤维/环氧树脂 压制物)
WYSIWYG : “what you see is what you get”
wave soldered ：热风焊
reflow oven : 回流焊
Manual Soldering : 手工焊接
Wave Soldering : 波峰焊
Reflow Soldering : 回流焊
solder joint : 焊接
cross talk ：串扰
EMI : electromagnetic interference, 电磁干扰
electromagnetic compatibility : EMC, 电磁兼容
inductive coupling : 电感耦合
capacitive coupling ： 电容耦合
Magnetic Fields : 磁场
conductor : 导体
the bypass capacitors act as low-pass filters : 旁路电阻
PSpice: [psais], 仿真
English units : mils and inches
metric units : millimeters(mm), centimeters(cm), or microns(um)
2 模拟电路元件尽量放在一起，连线尽量短；
数字电路元件不可能像模拟电路那样近，但尽量把相同功能的一组元件放在一起；
数字和模拟混合电路：分隔（数字和模拟、高速和低速）
3 元件电流回路采用“最小阻抗”原则；
