|
• Do not allow different DC voltage planes to overlap one another. For example the +5V and +15V planes should not overlap. Bipolar DC voltage planes, such as +15V and –15V, should overlap.
• Maximize the distributed capacitance in the DC power bus. Ideally, use parallel power and return planes with a Z 0 < 1 Ω .
• Minimize the series inductance of any lumped decoupling capacitors. For boards with power and return planes, this inductance is caused by the traces and vias that connect the capacitor to the planes.
• Provide at least one decoupling capacitor (1-100nF) for each integrated circuit DC power pin. Provide bulk decoupling ( μ F) where the DC power comes onto the board and at the output of each voltage regulator and DC-DC convertor.
• For boards with power and return planes, the integrated circuits share all the decoupling capacitors on the board.
|
