Agilent Technologies 93000 SOC Series Training Manual page 535

Mixed-signal training

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Also, changes of the supply voltage will influence the generated or

received signal and thus increase the noise level.

Use lowpass filters or at least bypass capacitors to reduce noise.

A lowpass filter can be directly inserted into the supply lines.

Bypass capacitors should include electrolytic and ceramic capacitors.

Electrolytic capacitors (10 µF...100 µF) cover the low frequency

range.They can be positioned anywhere on the DUT board.

Ceramic capacitors (10 nF...100 nF) cover the high frequency range. They

should be placed as close to the DUT pins as possible.

At the very least, the following supplies should be filtered:

Power supply for test circuit components

Power supply for pull-up

Power supply for relays

DUT reference voltage

Termination bias voltages

Some examples for bypass capacitor connections are shown in the figure

As short as possible

Bypass Capacitors

Lesson 2 – DUT Board Design Considerations

Use multiple bypass capacitors

Utility Line

Utility Power

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