AWG G3 PAD FOR PS3 Specifikace stáhnout pdf (Strana 124)

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

124 System Reference, January 2001

DUT Board Design for Mixed-

Signal Tests

The previous sections describes the information for the

DUT board design focused on digital testing. This section

provides information focused on mixed-signal testing.

Analog signals can be easily disrupted by pulses (for

example clocks and digital signals). To avoid this problem,

both signal types must be physically separated.

Therefore, designing a DUT board for a mixed-signal

device requires more effort than designing a DUT board

for a purely digital device.

If you develop a DUT board, you should pay attention to

not only the signals but also the signal return paths

(digital ground and analog ground).

Guidelines

General Guidelines The following issues should always be considered:

• If you are using an IC socket, place it at the center of

the DUT board. This helps to create signal lines of equal

length which in turn support identical travelling times

of generated signals, sync pulses, and response signals.

• Put a mark at pin 1 of the socket to ensure that the

device is always inserted correctly.

• Take care that input and output signal lines are physi-

cally separated (they must not be conducted in

parallel).

• Ensure that relays and active components can be easily

replaced. This means: Use sockets and mark the correct

insertion position.

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AWG G3 PAD FOR PS3 Specifikace Strana 124