Agilent Technologies N5980A Manual de usuario descargar pdf (Pagina 5)

Serial BERT N4906B, Data Sheet V.3 5

Enhanced Measurement Suite

(option 101)

Figure 5: BERT scan including RJ/DJ speparation and total jitter

The BERT scan is used to measure the timing and

jitter behavior of the output signal of a device under

test (DUT). It measures the bit error ratio (BER)

versus the sampling point delay. The result can be

displayed as a so-called”bathtub” curve or as a his-

togram. A table shows the measured total jitter and

the separation into random jitter and deterministic

jitter components. The measurement method is

equivalent to the IEEE 802.3ae method.

Figure 6: Fast total jitter measurement for quick and accurate total

jitter measurements

The fast total jitter measurement method provides

fast and feasible total jitter measurements, around

40 times faster than a common BERT scan but with

comparable conﬁ dence level. Instead of compar-

ing bits until the BER reaches a deﬁ ned number

of bits or a deﬁ ned number of errors, it only com-

pares bits until it can decide with a 95% conﬁ dence

level whether the actual BER is above or below the

desired BER.

Figure 7: Spectral jitter decomposition for debugging the jitter

sources in a design

The spectral jitter measurement provides a method

for investigating the spectrum of the jitter in terms

of its power distribution over frequency. Determin-

istic jitter can be caused by repetitive data pat-

terns. It can also be caused by internal or external

periodic effects. The spectral jitter measurement

detects even small periodic components that may

be hidden in a high level of random noise. It shows

the frequencies of such components and measures

their contribution to the total jitter. This helps to

identify jitter sources and to reduce or eliminate

their inﬂ uence.

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Tel. 07121 / 51 50 50

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