Grounding And Signal Shielding - Agilent Technologies 93000 SOC Series Training Manual

Mixed-signal training

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Notice for 4.1G AWG

Grounding and Signal Shielding

Proper grounding is essential for precise measurements. Mixed-signal

devices differentiate between digital and analog ground and often also

between digital and analog supply voltage.

You will need two ground planes on the DUT board which are connected

somewhere via an inductor as shown in the following figure:

Digital Ground and Analog Ground

The signal generated by the WGF is in common with the digital ground, in

contrast to the other analog modules. You should consider the following

points when you design the DUT board:

Use two separate and large ground planes for connecting the digital ground

and analog ground of the device. On the DUT board, connect the two

ground planes via an inductor located as near to the DUT as possible.

Connect the shields (ground) of the coaxial cables to the digital ground

plane as near to the device as possible. If you trace transmission lines

instead of coaxial cables, separate the WGF ground lines from the digital

and analog ground planes. This is to protect the WGF ground from noise

Lesson 2 – DUT Board Design Considerations

Analog Ground

(Ground Plane)

Digital Ground

(Ground Plane)

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