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在DSP设计中解耦电容的使用指南
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大小:23 |
2010-11-26
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On page 13-14 of the TMS320C3x Users Guide, there is a note that
recommends using 0.1 mF decoupling capacitors on the Vdd pins of
the TMS320C31. Here we will provide tips on the number and types
of capacitors you should use.
1) On a multilayer PCB with separate Vcc /Vdd planes, half a dozen
0.1 mF will be ample. This assumes that other devices (e.g.,
memories) are decoupled adequately. Ceramics are the right choice.
The real rule is to find capacitors with no inductive component.
Electrolytics, for example, have a significant amount of inductance
due to their manufacturing method. That is why in many switching
regulators you find a large electrolytic in parallel with a small
ceramic capacitor.
recommends using 0.1 mF decoupling capacitors on the Vdd pins of
the TMS320C31. Here we will provide tips on the number and types
of capacitors you should use.
1) On a multilayer PCB with separate Vcc /Vdd planes, half a dozen
0.1 mF will be ample. This assumes that other devices (e.g.,
memories) are decoupled adequately. Ceramics are the right choice.
The real rule is to find capacitors with no inductive component.
Electrolytics, for example, have a significant amount of inductance
due to their manufacturing method. That is why in many switching
regulators you find a large electrolytic in parallel with a small
ceramic capacitor.
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