AWG G3 PAD FOR PS3 Spezifikationen PDF herunterladen (Seite 212)

7 Analog Modules Waveform Digitizers

212 System Reference, January 2001

Loop Back Routes

The input multiplexer can make the loop back route

between any pogo pins (except for SYNC CLK and SYNC

DATA pins). When the loop back route is made, the input

amplifier is disconnected from the input multiplexer. In

the following figure, the possible loop back routes are

represented with bold lines.

Figure 95 Loop Back Routes

The loop back route is designed so that the line impedance

becomes 50 ohm exactly. As a result, the bandwidth of the

loop back route extends up to 150 MHz (typical value) for

the high resolution digitizer, and 195 MHz (typical value)

for the high speed digitizer. Hence, by using the loop back

route, you can make a route that has better performance

than using additional user relays on the DUT board. Note

that the bandwidth of the loop back route between A+/B+/

C+/D+ and A-/B-/C-/D- pins is narrower than the above

typical values.

For example, to test a DUT, you may need to change tester

resources connected with a DUT pin, depending on test

items. The following figure shows an example. The DUT

needs a high speed digitizer for a test item and a high reso-

A+

A-

B+

B-

C+

C-

D+

D-

SYNC CLK

Pogo Pin

Input Multiplexer

loopback4

SYNC DATA

Conversion

Clock

Start/

End

ADC

Filter

Sequencer/

Waveform

Memory

Timing

Generator

Input

Amp

offset

DGND

AGND

1 2 ... 207 208 209 210 211 212 213 214 215 216 217 ... 284 285

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