Teledyne LeCroy AORM - Advanced Optical Recording Measurements - Manual (Page 116)

114
ISSUED: June 2013 923133 Rev A
Simulation result showing transfer function of the digital low-pass filter and 3-tap EQ (boost) filter,
set to 8.2 MHz cutoff frequency and 3.2 dB boost.
Leveled
There are no additional conditions to produce leveled data. The threshold is calculated and
subtracted even if the equalization could not be applied for the reasons described above.
Extract Clk
It is usually not possible to get data and clock signals correctly aligned from an optical drive to
visualize how the data edges align with the clock; in some cases, the clock may not be available
at all. This function produces a clock waveform from the data by passing it through a software
PLL. This output may be overlapped on the display with Leveled or Sliced output on another
4
4
3.2
2.9
20 log Spec
k
.
Re Spec
k
Im Spec
k
12 10
6 . 0
5 10
6 .
spec_f k ( )
0 2 10
6
4 10
6
6 10
6
8 10
6
1 10
7
1.2 10
7
4
3
2
1
0
1
2
3
4