Benpian finishing: PCB layout elements when.
table of Contents
A power supply line
- Width: width of the maximum operating current required X 3 times
- Dendritic swing, do not swing ring
- Drop: width \ length \ temperature three elements, there are computational tools.
Second, ground
- Mode, the number of individual ground
- Directions: infinite loop. Differently in order to reduce the pressure
Third, the signal line
- 3W principles: line width to line 3 times
- 50mil more from parallel power lines
- Three kinds of elements away from: the crystal, inductors, electromagnetic
- Upper and lower vertical
Fourth, crystal
Failures:
- Width> 8mil, as widely as possible
- Line length equal as possible, the more important the higher the frequency;
- And a chip to do the same layer by,
- Away from the inductor, an electromagnetic;
- Cloth capacitance between the chips, crystal oscillator;
- The bottom surface with no wiring, no wiring bottom surface, a bottom surface with no wiring, large interference!
- Circuit underlying dig through 1-2 layers of copper non-compliance, non-compliance, since: 1_ anti parasitic capacitance (layered metal layer is close to large parasitic capacitance induced 2_ heat transfer offset frequency.
- A circuit surrounded by a thick ground wire, the wire is also surrounded by, and multiple ground holes played.
An example of a properly posted online:
