Agilent Technologies HP 8642A/B Specifiche Scaricare il pdf (Pagina 264)

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101

PLL GAIN CHANGE: This is the amount of gain change required to fit the

Theoretical Loop Suppression curve to the measured loop suppression.

A PLL GAIN CHANGE of greater than 1 dB will create an Accuracy

Specification Degradation Error. If an Accuracy Specification Degradation

is detected, the amount of error is determined from either the PLL GAIN

CHANGE or the MAX ERROR, which ever is larger. The degradation itself

is 1 dB less than the greater of these.

MAX ERROR: This is the measured error that still exists between the

the measured Loop Suppression and the Adjusted Theoretical Loop

Suppression. The four points on the Loop Suppression graph marked with

arrows (ranging from the —3 dB point down approximately —8 dB) are

the points over which the MAX ERROR is determined. An error of greater

than 1 dB will result in an Accuracy Specification Degradation.

CLOSED PLL BW: This is the predicted Phase Lock Loop Bandwidth for

the measurement. The predicted PLL BW is based on the predicted PTR.

The Closed PLL BW will not be adjusted as a result of an Accuracy

Specification Degradation. If an Accuracy Specification Degradation is

detected, the amount of error is determined from either the PLL GAIN

CHANGE or the MAX ERROR, which ever is larger. The degradation itself

is 1 dB less than the greater of these.

PK TUNE RANGE: This is the Peak Tuning Range (PTR) for the measure-

ment determined from the Tuning Constant and the Voltage Tune Range.

This is the key parameter in determining the PLL properties, the Drift

Tracking Range, and the ability to phase lock sources with high close in

noise.

5-6 Test Mode

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Agilent Technologies HP 8642A/B Specifiche Pagina 264

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