BNC 7000 Series User Manual - Manual (Page 23)

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3.4 Phase Noise Measurement Tab
In this tab the DUT’s signal frequency and power is detected and the phase noise of the signal in the
specified offset frequency range is analyzed. The measurement principle is based on the phase
discriminator method in combination with a two channel cross-correlation. In general, two internal or
external low noise reference sources are phase locked to the DUT signal. The frequency of the DUT is
detected and a well characterized phase locked loop is closed. Each receiver channel now converts
phase fluctuations between DUT and reference source into low frequency voltage signal by means of
a calibrated phase detector. Inside the PLL bandwidth, the phase differences are suppressed and
must be recovered. The two independent measurement channels are fed into FFT analyzers and
cross-correlator engine to suppress reference and receiver channel noise and to extract DUT phase
noise.
3.4.1 Measurement setup
The following section describes the basic setup procedure to perform the measurement within the
phase noise measurement tab. With just a few configuration steps, the phase noise measurement can
be performed.
Figure 6 Setup section of absolute phase noise tab
Berkeley Nucleonics Corporation 2955 Kerner Blvd., San Rafael, CA 94901
Phone: 415-453-9955, Fax: 415-453-9956, Email: [email protected], Web: www.berkeleynucleonics.com