9 performance, 1 no input – 1gsps, Performance – Sundance SMT8121 User Manual

Page 21: No input – 1gsps, Figure 12: no input/1gsps (j1)

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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

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