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Pattern Generator for Use with Oscilloscope

The N4962A serial BERT 12.5 Gb/s can be used as a high-performance GPIB-

programmable PRBS (pseudo-random bit sequence) generator. This application

is ideally suited for measuring the eye performance of the DUT, including ‘eye

mask’ measurements.

A simple PRBS generator block diagram is shown in Figure 1; this setup is used

to characterize the output performance of the BERT. The two small coaxial loops

are shown connecting the BERT clock outputs to the clock inputs. The LF TrigO

(615 to 709 MHz) output is connected to the scope trigger input.

Oscilloscope

LF TrigO

HF TrigO

JitterI

EXT CKI

TX CKO

~IN

~OUT

OUT

RX CKI

RX CKO

TX CKI

N4962A serial BERT

12.5 Gb/s

Trigger

input

Data

input

Figure 1. Block diagram – performance veriﬁcation with oscilloscope

Figure 2. Block diagram – DUT eye-mask measurement with oscilloscope

Once the BERT output has been characterized with rise/fall times, RMS and p-p

jitter, output amplitude, eye height, signal-to-noise ratio, etc, a common applica-

tion is to measure the performance of a DUT, shown in Figure 2.

Oscilloscope

LF TrigO

HF TrigO

JitterI

EXT CKI

TX CKO

~IN

~OUT

OUT

DUT

RX CKI

RX CKO

TX CKI

N4962A serial BERT

12.5 Gb/s

Precision

Trigger

input

Data

input

1 2 3 4 5 6 7 ... 11 12

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