AWG G3 PAD FOR PS3 Specifikace stáhnout pdf (Strana 125)

DUT Board Design for Mixed-Signal Tests 5 DUT Board Performance Considerations

System Reference, January 2001

125

• Problems will occur: Ensure that the DUT board can be

easily changed and debugged.

• Ensure that the required auxiliary components do not

interfere with the IC handler or waver prober. If

possible, consider mounting the components on the

rear of the DUT board.

Additional Mixed-Signal

Guidelines

The following issues are essential for mixed-signal

devices:

• Use two separate and fairly large ground planes for

connecting the digital and analog ground of the device.

On the DUT board, connect the two ground planes via

an inductor. An inductor protects the analog ground

from spikes on the digital ground.

• Ensure that all connections between digital and analog

signals to their respective grounds are as short as

possible.

• Separate analog and digital signals physically.

• Use impedance-matching coaxial cables at least for all

high frequency or low amplitude signals. Coaxial cables

will shield the signals from radiating or picking up

noise. Matching the source impedance will provide

maximum signal power and least distortion.

• Use separate power supply channels for supplying the

digital and analog circuits of the DUT, if possible.

• Remove spikes that can be induced via the power

supply. Insert bypass capacitors between the power

supply pins of the DUT and ground. These capacitors

should be as close to the DUT as possible.

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AWG G3 PAD FOR PS3 Specifikace Strana 125