Analog Devices AD9643 User Manual page 11

AD9643/AD9613/AD6649/AD6643 User Guide
Adjusting the Amplitude of the Input Signal
The next step is to adjust the amplitude of the input signal for
each channel as follows:
1. Adjust the amplitude of the input signal so that the
fundamental is at the desired level. (Examine the Fund Power
reading in the left panel of the VisualAnalog Graph window.)
See Figure 17.
2. Repeat this procedure for Channel B if desired.
3. Click the Save disk icon within the Graph window to save
the performance plot data as a .csv formatted file. See
Figure 16 for an example.
Figure 17. Graph Window of VisualAnalog (AD9643)
Rev. A | Page 11 of 26
0
250MSPS
90.1MHz @ –1dBFS
SNR = 70.6dB (71.6dBFS)
–20
SFDR = 88dBc
–40
–60
THIRD HARMONIC
SECOND HARMONIC
–80
–100
–120
–140
0 10 20 30 40 50 60
FREQUENCY (MHz)
Figure 16. Typical FFT,
UG-293
70 80 90 100 110 120
AD9643