Detector, Video bandwidth filter, An introduction to spectrum analyzers – GW Instek GRF-1300A User Manual

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An Introduction to Spectrum Analyzers

Figure B-5.
The effect of
different RBWs
(2)

Signal under test

RBW

Results

RBW1

RBW2

Detector

Following the RBW filter, the detector detects the power

and coverts it to DC voltage via an ADC so that it can be
displayed.

Figure B-6.
Detector

Video Bandwidth Filter

However, a filter is employed after the detector to filter out

the noise generated by the detector. This is the function of the
VBW (video bandwidth) filter as shown in Figure B-7.

Figure B-7.
VBW filter