Guidelines for RF / Microwave Design -Power Bus
Guidelines for RF / Microwave Design -Power Bus
1.Route Power in 2 Layer Board (Microstrip,CPW or CPWG) (Only Plane is Ground).
2.In Multilayer Boards Power Can be Plane if One(1) Voltage or Split Plane if Several Voltages.
3.In Multilayer Board with Many Voltages,Power is Usually Routed on One (1) or more Layers.
4.When Routed, Make Power Grid if two(2) or more Layers are used. Grid Most Closely Emulates Behavior of a Plane.
5.Due to Self Resonance of Decoupling Caps,selected to match Frequency of Operation,Wide Routes work as well in Analog Circuits to distribute Power as do Planes.
6.Power is generally ------------------- Ground
Routed between -- -- -- -- -- -- Power
Ground Planes to ------------------- Ground help Lower Noise Coupling in Power Bus.
7.Ground Planes are Always Continuous.(Only Split at Front Panel for Cable Shields and Filters)
8.Power Decoupling Consists of Low Pass Filter with Several Capacitors to Cover a Broad Range of Frequencies and Currents
9.Select Capacitors in Low Pass Filter so Smallest Value has Self Resonance of Operating Frequency of Circuit.
10.Largest Value selected to carry Maximum Current Drawn by IC.
11.Capacitors Progress Upward in Value in Steps of 10 Times.
12.Place Caps w/ Smallest Value Near IC, then Next Largest Value, etc.
13.Place Smallest Value Capacitor AT Power and Ground Pins of IC.
14.Ideally, Capacitors are in Parallel with Power& Ground Pins of IC.
15.When Not Possible, Place Smallest Value Capacitor at Power Pin of IC and as Near Ground Pin as Possible.
16.Attach Caps w/ Wide Traces & Gnd Floods.
17.Many Vias, Large Enough to Carry Current.
To know more:
Guidelines for RF / Microwave Design -Integral Components
Guidelines for RF / Microwave Design -Layout Techniques and Strategies
Guidelines for RF & microwave PCB Design
The basic knowledge about RF Microwave PCB design
Recommend reading list for RF/Microwave PCB design
PCB Blog
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