81134A Datasheet, PDF (4/10 Pages) Keysight Technologies – 3.35 GHz Pulse Pattern Generators

04 | Keysight | 81133A and 81134A, 3.35 GHz Pulse Pattern Generators - Data Sheet
Variable Crossover
For each channel, the cross over of the NRZ signal in PRBS or
data mode can be adjusted. This is used to artificially close the
eye pattern simulating distortion. Figure 1 shows the normal and
complement output with cross over point set to 50% and 70%
respectively.
NOTE: Variable Crossover feature is available in NRZ mode only.
Pattern
There are two types of patterns available:
Data
Arbitrary data up to the maximum available memory per channel
can be setup as pattern data.
PRBS
Predefined PRBS of 25-1 to 231-1 can be setup as pattern data.
Data Polarity
In pattern mode the polarity of the data can be set to either
normal or inverted. When set to inverted, a logical ‘1’ will become
a logical ‘0’ at the output and vice versa.
Levels
Pre-defined levels
Pre-defined levels allow the easy setup of the channels for
commonly used logic families. These are: ECL, ECLGND, LVT,
LVPCL and LVDS.
Custom levels
Levels can be set to custom values in either of two ways:
–– low level and high level
–– amplitude and offset
Level protection
Output levels can be limited to a user defined range to protect the
device under test. Level protection can be switched on and off.
Level polarity
Level polarity can be set to either normal or inverted. Set to in-
verted, the low level and the high level values are interchanged.
Outputs enable/disable
Outputs can be switched on and off independently for each
channel and for each normal/complement connector.
50%
50%
70%
30%
Figure 1. Variable crossover
Normal out
Compl. out
Normal out
Compl. out