|English _ 2012-10-01 _ PDF 344 KB 5991-1128EN c20121025 .pdf||Agilent 33500 Series
PRBS Pattern Generation
Testing digital devices typically requires sending a series
of alternating high and low voltage values (bits) to the
device under test (DUT). If these bits are easily predict-
able, the test coverage will be limited to a small set of
possible scenarios. For this reason, it is often helpful
to send a near-random stream of bits, such as the one
shown in Figure 1, to the DUT.
To generate this type of bit stream, the Agilent 33500
Series waveform generators include a pseudo-random
binary sequence (PRBS) waveform generator. A PRBS
waveform is generated by a linear feedback shift register
(LFSR) like the one shown in Figure 2.
Figure 1. A near-random stream of bits
The branches after register cells 5 and 9 are cal|