Agilent Technologies E5503A Guía de usuario descargar pdf (Pagina 146)

100

101

Agilent Technologies E5500 Phase Noise Measurement System

7-21

Absolute Measurement Examples

Stable RF Oscillator

There are four different curves available for the this graph (for more

information about loop suppression verification, refer to Chapter 16,

“Advanced Software Features”):

a. “Measured” loop suppression curve - this is the result of the loop

suppression measurement performed by the E5500 system;

b. “Smoothed” measured suppression curve - this is a curve-fit

representation of the measured results, it is used to compare with the

“theoretical” loop suppression;

c. “Theoretical” suppression curve - this is the predicted loop

suppression based on the initial loop parameters defined/selected for

this particular measurement (kphi, kvco, loop bandwidth, filters,

gain, etc).

d. “Adjusted” theoretical suppression curve - this is the new “adjusted”

theoretical value of suppression for this measurement - it is based on

changing loop parameters (in the theoretical response) to match the

“smoothed” measured curve as closely as possible;

When the measurement is complete, refer to Chapter 15, “Evaluating Your

Measurement Results” for help in evaluating your measurement results.

Figure 7-5 on page 7-21 shows a typical phase noise curve for a stable RF

Oscillator.

Figure 7-5 Typical Phase Noise Curve for a Stable RF Oscillator.

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