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 Network Analyzers using PXI software

The bandwidth search function allows to determine and view the following parameters of a passband or a stopband: bandwidth, center frequency, lower frequency, higher frequency, Q value, and insertion loss (See figure below).

The bandwidth search is executed from the reference point. The active marker or the maximum trace value can be selected as the reference. The bandwidth search function detects lower and higher cutoff frequencies that differ from the reference point response by a user-specified bandwidth value (usually – 3 dB).

Bandwidth search

F1 and F2 are the lower and higher cutoff frequencies of the band respectively

Bandwidth search

Bandwidth parameters

Parameter Description

Symbol

Definition

Formula

Bandwidth

BW

The difference between the higher and lower cutoff frequencies.

F2 – F1

Center Frequency

cent

The midpoint between the higher and lower cutoff frequencies.

(F1+F2)/2

Lower Cutoff Frequency

low

The lower frequency point of the intersection of the bandwidth cutoff level and the trace.

F1

Higher Cutoff Frequency

high

The higher frequency point of the intersection of the bandwidth cutoff level and the trace.

F2

Quality Factor

Q

The ratio of the center frequency to the bandwidth.

cent/BW

Loss

loss

The trace measured value in the reference point of the bandwidth search.

Bandwidth Search softkey

Bandwidth Search OFF

To enable/disable bandwidth search function, use the following softkeys:

Markers > Marker Math > Bandwidth Search > Bandwidth Search

 

Type Bandpass

Set the bandwidth search type by softkeys:

Markers > Marker Math > Bandwidth Search > Type

The type and the softkey label toggle between Bandpass and Notch settings.

 

Search Ref

To set the search reference point, use the following softkeys:

Markers > Marker Math > Bandwidth Search > Search Ref >  > [Marker | Maximum | Minimum]

 

Bandwidth value -3 dB

To enter the bandwidth value, use the following softkeys:

Markers > Marker Math > Bandwidth Search > Bandwidth Value

 

 

 

 

Rev.:  22.3