AD9861 datasheet(18/52 Pages) AD

18 / 52 page

AD9861

Rev. 0 | Page 18 of 52

Figure 52 to Figure 57 use the same input data to the Tx path, a 64-carrier OFDM signal over a 20 MHz bandwidth, centered at 20 MHz.

The center two carriers are removed from the signal to observe the in-band intermodulation distortion (IMD) from the DAC output.

7.5

17.5

22.5

27.5

12.5

–130

–120

–110

–100

–90

–80

–70

–60

–50

–40

–30

32.5

FREQUENCY (MHz)

Figure 52. AD9861 Tx Path FFT, 64-Carrier (Center Two Carriers Removed)

OFDM Signal over 20 MHz Bandwidth, Centered at 20 MHz, with

20 mA Full-Scale Output into 60 Ω Differential Load

7.5

8.0

8.5

9.0

9.5

10.0

10.5

11.0

11.5

12.0

–130

–120

–110

–100

–90

–80

–70

–60

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12.5

FREQUENCY (MHz)

Figure 53. AD9861 Tx Path FFT, Lower-Band IMD Products of

OFDM Signal in Figure 52

1020304050

6070

–130

–120

–110

–100

–90

–80

–70

–60

–50

–40

–30

FREQUENCY (MHz)

Figure 54. AD9861 Tx Path FFT of OFDM Signal in Figure 52,

with 1× Interpolation

18.75

19.75

20.25

20.75

19.25

–130

–120

–110

–100

–90

–80

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–50

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–30

21.25

FREQUENCY (MHz)

Figure 55. AD9861 Tx Path FFT, In-Band IMD Products of

OFDM Signal in Figure 52

27.5

28.0

28.5

29.0

29.5

30.0

30.5

31.0

31.5

32.0

–130

–120

–110

–100

–90

–80

–70

–60

–50

–40

–30

32.5

FREQUENCY (MHz)

Figure 56. AD9861 Tx Path FFT, Upper-Band IMD Products of

OFDM Signal in Figure 52

1020304050

6070

–130

–120

–110

–100

–90

–80

–70

–60

–50

–40

–30

FREQUENCY (MHz)

Figure 57. AD9861 Tx Path FFT of OFDM Signal in Figure 52,

with 4× Interpolation

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