Agilent Technologies 93000 SOC Series Training Manual page 532

Lesson 2 – DUT Board Design Considerations
or picking up noise. Matching the source impedance will provide
maximum signal power and least distortion.
Use separate power supply cards for supplying the digital and analog
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circuits of the DUT, if possible.
Remove spikes that can be induced via the power supply. Insert bypass
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capacitors between the power supply pins of the DUT and ground. These
capacitors should be as close to the DUT as possible.
In the pogo tower, seperate sectors should be used for digital analog.
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