Pentek 6210 Operating Manual page 120

AD6640
0
ENCODE = 65MSPS
AIN = 19.5MHz @ –36dBFS
–20
NO DITHER
–40
–60
–80
–100
–120
dc 65 13.0
FREQUENCY – MHz
Figure 19. 16K FFT without Dither
100
90
ENCODE = 65MSPS
80
AIN = 19.5MHz
NO DITHER
70
60
50
40
30
20
SFDR = 80dB
10
REFERENCE LINE
0
–80 –70 –60 –50
ANALOG INPUT POWER LEVEL – dBFS
Figure 20. SFDR without Dither
0
ENCODE = 50MSPS
AIN = 65.5, 68.5MHz
–20 NO DITHER
–40
–60
ANALOG IF
FILTER MASK
–80
–100
–120
50 55
FREQUENCY – MHz
Figure 21. IF-Sampling at 70 MHz without Dither
19.5 26.0 32.5
–40 –30 –20 –10 0
0
–30
ALIASED
SIGNALS
–60
–90
–120
60 65 70 75
0
–20
–40
–60
–80
–100
–120
dc 65
Figure 22. 16K FFT with Dither
100
90
ENCODE = 65MSPS
80
AIN = 19.5MHz
DITHER = –32.5dBm
70
60
50
40
30
20
SFDR = 80dB
10
REFERENCE LINE
0
–80 –70 –60
ANALOG INPUT POWER LEVEL – dBFS
Figure 23. SFDR with Dither
0
ENCODE = 50MSPS
AIN = 65.5MHz, 68.5MHz
–20
DITHER = –32.5dBm
–40
–60
ANALOG IF
FILTER MASK
–80
–100
–120
50 55
Figure 24. IF-Sampling at 70 MHz with Dither
–10–
ENCODE = 65MSPS
AIN = 19.5MHz @ –36dBFS
DITHER = –32.5dBm
13.0 19.5 26.0
FREQUENCY – MHz
–50 –40 –30 –20 –10
ALIASED
SIGNALS
60 65 70
FREQUENCY – MHz
32.5
0
0
–30
–60
–90
–120
75
REV. 0