ADL5545

Data Sheet

Rev. 0 | Page 16 of 20

OPERATION DOWN TO 30 MHz

To operate the ADL5545 at frequencies below 100 MHz, a feed-

back network must be implemented between the input and output

ports of the device to ensure stability. Figure 34 shows a sample

configuration used to evaluate the device at frequencies below

100 MHz. Figure 35 to Figure 37 demonstrate the performance

of the device in this configuration.

1

2

(2)

3

ADL5545

L1

1000nH

GND

RFIN

C1

100nF

RFOUT

C2

100nF

C6

10µF

C5

1nF

C4

100pF

1500Ω

10nF

Figure 34. Setup for Low Frequency Operation Down to 30 MHz

40

35

0

5

10

15

20

25

30

30

40

50

60

70

80

90

100

FREQUENCY (MHz)

P1dB

OIP3

GAIN

NOISE FIGURE

Figure 35. Noise Figure, Gain, P1dB, and OIP3 vs. Frequency,

30 MHz to 100 MHz

0

–5

–10

–15

–20

–35

–30

–25

30

40

50

60

70

80

90

100

FREQUENCY (MHz)

S12

S22

S11

Figure 36. Return Loss and Reverse Isolation, 30 MHz to 100 MHz

32

31

30

29

28

27

26

–7

–5

–3

1

–1

+85°C

+105°C

–40°C

+25°C

W-CDMA ACPR PERFORMANCE

Figure 38 shows a plot of the adjacent channel power ratio

single wideband code division multiple access (W-CDMA)

carrier (Test Model 1-64) at 2140 MHz. 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

instrument noise-correction function.

0

–80

–70

–60

–50

–40

–30

–20

–10

–20

–15

–10

–5

0

5

at 2140 MHz

The ADL5545 achieves an ACPR of −79 dBc at an output power

level of −4 dBm, at which point device noise and not distortion

begins to dominate the power in the adjacent channels. At an

output power level of 0 dBm, ACPR is still very low at −69 dBc.