
Time Interval Analyzer 7 Analog Modules
System Reference, January 2001
237
The front-end module has seven signal input pins and two
trigger input pins. The 7x4 multiplexer inside the front-
end module routes one or two input pins among seven
input pins to the input channels (CH1 and CH2) of each
TIA instrument. The TIA instrument performs the time
interval measurement for the signals entered to CH1 and
CH2 of the TIA. The trigger input pin is routed to each TIA
instrument to send the arming trigger signal. For single
channel measurement (PW,PER,FREQ), input pins are
connected only to the CH1. For dual channel measurement
(PD), input pins are connected to the CH1 and CH2.
The following sections describe the front-end module and
TIA instrument in detail.
Front-end Module
The following is the block diagram of the front-end
module.
Figure 109 Front-end Module Block Diagram
IN-5
LOOPBACK-5
IN-6
LOOPBACK-6
IN-7
LOOPBACK-7
IN-4
LOOPBACK-4
IN-3
LOOPBACK-3
IN-2
LOOPBACK-2
IN-1
LOOPBACK-1
Programmable
Delay
Programmable
Delay
Programmable
Delay
Programmable
Delay
Programmable
Delay
Programmable
Delay
7X4 MUX
Center Block
Output Block
Input Block1
Trigger Input
Block
TRG1
TRG2
CH1
CH2
TRG
CH1
CH2
TRG
frontend1
To Input Block
GND1
To TRIG1 or 2
To TRIG1 or 2
To TRIG1 or 2
To TRIG1 or 2
To TRIG1 or 2
To TRIG1 or 2
To TRIG1 or 2
GND2
GND3
Input Block2
Input Block3
Input Block4
GND4
Input Block5
GND5
Input Block6
GND6
Input Block7
GND7
To Input B lock
DGND
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