ADL5545

Data Sheet

Rev. B | Page 12 of 18

APPLICATIONS INFORMATION

BASIC CONNECTIONS

Figure 29 shows the basic connections for operating the

ADL5545. The device supports operation from 30 MHz to 6 GHz.

However, for optimal performance at lower and higher frequency

bands, the board configuration must be adjusted. Table 5 lists

the recommended board configuration to operate the device at

various frequency bands.

1

2

(2)

3

ADL5545

L1

VPOS

GND

C7

RFIN

C1

C8

RFOUT

C2

C6

10µF

C5

1nF

C4

100pF

Figure 29. Basic Connections

A 5 V dc bias is supplied to the amplifier through the bias

inductor connected to RFOUT (Pin 3). The bias voltage must

be decoupled using 100 pF, 1 nF, and 10 µF power supply

decoupling capacitors. The typical current consumption for

the ADL5545 is 56 mA.

At low and high frequencies, the device exhibits improved

performance with the suggested setup configuration listed in

Table 5. Figure 30 to Figure 33 provide a comparison of the

performance of the device at the 100 MHz to 500 MHz and

4 GHz to 6 GHz bands when driven with the optimal setup

configuration and the default setup configuration.

40

35

0

5

10

15

20

25

30

0.10

0.15

0.20

0.25

0.30

0.35

0.40

0.45

0.50

FREQUENCY (GHz)

GAIN, DEFAULT SETUP CONFIGURATION

GAIN, LOW FREQUENCY CONFIGURATION

P1dB, DEFAULT SETUP CONFIGURATION

P1dB, LOW FREQUENCY CONFIGURATION

NOISE FIGURE, DEFAULT SETUP CONFIGURATION

NOISE FIGURE, LOW FREQUENCY CONFIGURATION

OIP3, DEFAULT SETUP CONFIGURATION

OIP3, LOW FREQUENCY CONFIGURATION

Figure 30. Noise Figure, Gain, P1dB, and OIP3 vs. Frequency,

100 MHz to 500 MHz, Comparison of Performance

with the Optimized Settings and the Default Configuration

0

–5

–10

–15

–25

–35

–20

–30

0.10

0.15

0.20

0.25

0.30

0.35

0.40

0.45

0.50

FREQUENCY (GHz)

S11, DEFAULT SETUP CONFIGURATION

S12, DEFAULT SETUP CONFIGURATION

S22, DEFAULT SETUP CONFIGURATION

S11, LOW FREQUENCY CONFIGURATION

S12, LOW FREQUENCY CONFIGURATION

S22, LOW FREQUENCY CONFIGURATION

Figure 31. Return Loss and Reverse Isolation, 100 MHz to 500 MHz,

Comparison of Performance with the Optimized Settings

and the Default Configuration

Table 5. Recommended Components for Basic Connections

Frequency Band

AC Coupling Capacitors (0402)

DC Bias Inductor (0603HP)

High Frequency Matching

Capacitors (0402)

C1

C2

L1

C7

C8

100 MHz to 500 MHz

100 nF

100 nF

1000 nH

Do not install

Do not install

500 MHz to 4 GHz (default)

100 pF

100 pF

100 nH

Do not install

Do not install

4 GHz to 6 GHz

100 pF

100 pF

12 nH

0.1 pF

0.1 pF