Sundance SMT8121 - Manual (Page 21)

9 Performance
The following screen captures are from a spectrum analyser Anritsu-MS2717A
(100KHz – 7.1GHz).
Note 1: the system displays rays at 125MHz and 375MHz when sampling at 1Gsps.
These are images of the clock used by the SDB interfaces. They appear always at
1/8
th of the sampling frequency.
Note 2: no filtering has been applied to the input signal. Filtering accordingly the
input signal could reduce the spur frequencies displayed in the following
measurements.
9.1 No input – 1Gsps
Figure 12: no input/1Gsps (J1)
Application Note SMT8121 Page 21 of 26 Last Edited: 19/02/2009 16:32:00