Rohde & Schwarz 1332.4500.22, User Manual

Page: 632 / 1476

GUI Reference
R&S
®
ZNA
632 User Manual 1178.6462.02 ─ 12
In dB the pre- and post cursors are defined as:
●
Pre Cursor = 20 log
10
( Vd / Vc )
●
Post 1 Cursor = 20 log
10
( Vb / Va )
●
Post 2 Cursor = 20 log
10
( Vc / Vb )
Simple applications of the emphasis only define the Post 1 Cursor. Use a negative
value (in dB) for increasing the amplitude of the first bit after a transition. Below an
example for Post 1 Cursor = -3dB:
The FIR filter coefficients are found by solving the equations:
c
-1
+ c
0
– c
1
– c
2
= Va
c
-1
+ c
0
+ c
1
– c
2
= Vb
c
-1
+ c
0
+ c
1
+ c
2
= Vc
-c
-1
+ c
0
+ c
1
+ c
2
= Vd
subject to the normalization condition | c
-1
| + | c
0
| + | c
1
| + | c
2
| = 1.
Active
Enables/disables pre-emphasis.
Remote command:
CALCulate<Chn>:EYE:EMPHasis:STATe
Cursor Settings
Sets the weights of the filter taps in the pre-emphasis FIR filter.
Remote command:
CALCulate<Chn>:EYE:EMPHasis:CURSor:PRE
CALCulate<Chn>:EYE:EMPHasis:CURSor:POST<1|2>
Jitter
The "Define Eye Jitter" dialog allows you to add jitter to the digital signal simulated for
the eye diagram measurement.
Access: "Jitter" button in the Advanced Settings Dialog
Applic Softtool