Pulse signal as required
High-speed clock signal
Square wave
Flexible serial or parallel bit patterns and data streams
Pulse code signal parameter definition
The pulse pattern generator provides complete control of all pulse parameters, such as timing, level, and edge, as shown in the following figure. It can be used to set continuous or triggered pulse streams, with the flexibility to adapt to the most challenging applications. All parameters can be adjusted according to the needs of specific applications. Unlike the arbitrary waveform generator, the highest frequency specified is not the sampling rate, but the highest frequency of the rectangular wave output.
Figure 1 Definition of pulse parameters
Pattern data and PRBS
The pulse pattern generator can not only generate simple pulse, burst and continuous pulse streams as mentioned above. Its code pattern capability can also generate data signals. This versatility is the key to digital device testing applications, such as compliance testing. The code pattern mode can achieve the same complete control of signal output as the traditional pulse generation mode. It allows the generation of an unlimited number of data signals, including standard non-return-to-zero (NRZ) signals, or data bursts with programmable pulse width and additional delay to the clock signal.
In addition to user-defined data signals, standard pseudo-random binary sequences (PRBS) can also be generated. The ability to build user-defined bit patterns, standard compliance data, and PRBS makes the pulse pattern generator an ideal signal source for the following applications:
Excited eye measurement
Crosstalk measurement
Conformance test
Jitter test
Signal integrity measurement
Receiver sensitivity test
Figure 2 Signal parameters of pattern / data / PRBS
The pulse pattern generator provides all the tools to generate the data packets needed for the testing of digital bus devices: integrated pattern editor, PC-based graphics enhanced data and pattern management software, segmented loop features and hardware to generate PRBS.
So engineers can quickly gain insight into their digital bus devices-including those used for the following buses:
USB 2.0
Serial ATA
PCI Express
Firewire and others
These tools can be used to easily perform all measurements, from physical layer characterization, signal integrity and jitter measurements to comprehensive standards compliance testing.
Pulse pattern generator jitter generation capability
The jitter insertion capability can be used for jitter tolerance testing. Target applications of 81133A and 81134A include physical layer characterization, as well as signal integrity and jitter testing. 81134A is also the recommended solution for PCI Express and Serial ATA conformance testing. Injection method: Use delay control input and external modulation source to perform pressure or stress test by modifying jitter size and shape.
Figure 3 Jitter injection method and results
The structure of the pulse code generator circuit structure The principle of the pulse code generator circuit structure is shown in the following figure, including the clock generation part, the memory and the logic part, and the signal shape control part.
Figure 4 The principle of the pulse pattern generator circuit structure
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