Agilent Technologies HP 8642A/B Specifiche Scaricare il pdf (Pagina 238)

100

101

where: S

(f) = ^S*(/)

This equation is numerically integrated in the HP 3048A software. The

lower limit of integration, 0, is replaced by the minimum offset frequency

for which there is data in memory

Because arbitrarily low frequency

data is not available, the maximum possible r for which

<T(T,

//,) can be

computed is

max

= ^J—.

The upper limit of integration (fh) is specified by the user based on the

actual bandwidth of the system in which he tests or uses the particular

device for which (7y{r) is being calculated.

Depending on the dominant slope of the phase noise at offsets 1 decade

above and below -k-, the maximum value of r for which an accurate

computation of a can be made and can be chosen as shown in Table 4-2.

Table 4-2. Slope versus Maximum Tau

Slope of £(/)

—50 dB/decade

—40 dB/decade

-30 dB/decade

-20 dB/decade

— 10

dB/decade

0 dB/decade

Maximum r for

data to

min

/mm

'JJmin

"Jmm

dJmin

°Jmin

As appropriate

Calculation not recommended. Will not be accurate unless there is a

region of shallower slope below the 50 dB/decade region.

System Default.

4-12 Sigma vs. Tau

rev.05SEP89

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Agilent Technologies HP 8642A/B Specifiche Pagina 238

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