ADL5535

Data Sheet

Rev. A | Page 12 of 16

ACPR PERFORMANCE

Figure 18 shows a plot of the adjacent channel power ratio

(ACPR) vs. POUT for the ADL5535. The signal type used is a

single wideband code division multiple access (W-CDMA)

carrier (Test Model 1-64). This signal is generated by a very

low ACPR source. ACPR is measured at the output by a high

dynamic range spectrum analyzer that incorporates an instru-

ment noise-correction function. At an output power level of

+8 dBm, ACPR is still very low at −65 dBc, making the device

suitable for use in driver applications.

–85

–80

–75

–70

–65

–60

–55

–50

–45

–40

–35

–5

–3

–1

1

3

5

7

9

11

13

POUT (dBm)

380MHz

190MHz

190MHz SOURCE POWER

OUTPUT REFERRED

380MHz SOURCE POWER OUTPUT REFERRED

Figure 18. ACPR vs. POUT, Single W-CDMA Carrier (Test Model 1-64)

at 190 MHz and 380 MHz

ERROR VECTOR MAGNITUDE (EVM) PERFORMANCE

Error vector magnitude (EVM) is a measure used to quantify the

performance of a digital radio transmitter or receiver. A signal

received by a receiver has all constellation points at their ideal

locations; however, various imperfections in the implementation

(such as magnitude imbalance, noise floor, and phase imbalance)

cause the actual constellation points to deviate from their ideal

locations. The ADL5535 shows excellent performance when used

with higher-order modulation schemes, such as a 16 QAM.

Figure 19 illustrates the EVM performance of the ADL5535 when

driven with a 16 QAM 10 Msym/s signal. Degradation of the EVM

performance starts to occur at an output power of +12 dBm.

–45

–40

–35

–30

–25

–20

4

6

8

10

12

14

16

18

POUT (dBm)

380MHz SOURCE POWER OUTPUT REFERRED

380MHz

190MHz

190MHz SOURCE POWER

OUTPUT REFERRED

Figure 19. EVM Performance vs. POUT with a 16 QAM, 10 Msym/s Signal