AWG G3 PAD FOR PS3 Dokumentacja Strona 238

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7 Analog Modules Time Interval Analyzer
238 System Reference, January 2001
The front-end module consists of the following three kinds
of blocks:
Input block
Center block
Output block
The following sections describe the functions of each
block.
Input Block
In the front-end module, there are seven input blocks. One
input block corresponds to one input pin. There is one
trigger input block for two trigger pins. The grounds of the
input blocks are separated from each other. This is to
prevent interference among the signals entered to the
input pins.
Below is the block diagram of the input block for one input
pin.
Figure 110 Input Block
The input block has the following functions:
Receives the signal at the input pin and converts the
signal to the two level digital signal (high and low)
according to the specified threshold voltage at the
comparator.
10 kohm
50 ohm
Threshold
voltage
IN-1
LOOPBACK-1
To 7x4 MUX
Input Block
Comparator
frontend2
Termination
voltage
To TRIG1
or TRIG2
GND1
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