Agilent Technologies E5503A Guia do Utilizador descarregar pdf (Página 389)

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Agilent Technologies E5500 Phase Noise Measurement System

Advanced Software Features

PLL Suppression Verification Process

PLL Gain Change PLL gain change is the amount in dB by which the theoretical gain of the

PLL must be adjusted to best match the smoothed measured loop

suppression. The parameters of the theoretical loop suppression that are

modified are Peak Tune Range (basically open loop gain) and Assumed Pole

(for example a pole on the VCO tune port that may cause peaking).

Maximum Error Maximum Error is the largest difference between the smoothed measured

loop suppression and the adjusted theoretical loop suppression in the

frequency range plotted for the smoothed measured loop suppression.

The frequency of the assumed pole is normally much greater than the Closed

PLL BW and there is no loop peaking. If the smoothed measured PLL

suppression shows peaking, the assumed pole is shifted down in frequency

to simulate the extra phase shift that caused the peaking. If the peaking is

really due to a single pole at a frequency near the Closed PLL BW, the

adjusted theoretical loop suppression and smoothed measured loop

suppression will show a good match and the maximum error will be small.

Accuracy Degradation Accuracy spec. degradation is determined by taking the larger of Maximum

Error and magnitude of PLL Gain Change and then subtracting 1 dB.

Supporting an

Embedded VXI PC:

A.01.04 also allows the use of an embedded VXI PC running WIN NT 4.0.

In this case, the VXI interface to the VXI assets will be “VXI direct” (select

within the Asset Manager Configuration). The VISA I/O libraries must also

support the embedded PC’s GPIB card.

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