ADL5321

Rev. 0 | Page 12 of 16

Frequency (MHz)

ΓLoad

(Magnitude)

ΓLoad (°)

2600

0.6100

136.24

15.02

3500

0.7686

162.58

14.02

3600

0.7057

161.81

13.44

Frequency (MHz)

ΓLoad

(Magnitude)

ΓLoad (°)

2600

0.4705

86.63

41.7

3500

0.6911

142.11

41.37

3600

0.7070

140.65

41.29

WiMAX OPERATION

Figure 25 shows a plot of adjacent channel leakage ratio (ACLR)

64 QAM, single carrier with a 10 MHz channel bandwidth. This

signal is generated by a WiMAX-enabled source and followed

with suitable band-pass filtering. The band-pass filter helps reduce

the adjacent and alternate channel noise and distortion out of

the signal generator down to −63 dB in the adjacent channels

and −76 dB in the alternate channels at 2.6 GHz and −60 dB

at 3.5 GHz.

Below an output power of 7 dBm, measured ADL5321 output

spectral performance is limited by the signal quality from the

signal source used (−63 dB at 2.6 GHz and −60 dB at 3.5 GHz).

At high power operation, input power to the ADL5321 is 1 dBm

for 15 dBm output power and the source ACLR is −60.2 dB. It is

expected that with a better signal source, the ADL5321 output

spectral quality improves further, especially at output power

levels ≤10 dBm. For instance, the ADL5373 quadrature modulator

measured ACLR is −69 dB for an output power of −10 dBm.

For output powers up to 10 dBm rms, the ADL5321 adds very

little distortion to the output spectrum. At 2.6 GHz, the ACLR is

−59 dB and a relative constellation error of −46.6 dB (<0.5% EVM)

at an output power of 10 dBm rms.

–30

–40

–50

–60

–70

–80

–90

–10

–5

0

5

10

15

20

ADJ CH LOW 2.6 GHZ

ALT CH LOW 2.6 GHZ

ADJ CH LOW 3.5 GHZ

ALT CH UP 3.5 GHZ

0

–5

–10

–15

–20

–25

–30

–35

–40

–45

–50

–20

–15

–10

–5

0

5

10

15

20

2.6 GHz

3.5 GHz