Data Sheet

ADL8143

APPLICATIONS INFORMATION

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Rev. 0 | 14 of 17

The basic connections for operating the ADL8143 from 8 GHz to

14 GHz are shown in Figure 49. No external biasing inductor is

required, allowing a 1.5 V supply to be connected to the VDD

pin. It is recommended to use 0.1 µF and 100 pF power supply

decoupling capacitors. The power supply decoupling capacitors

shown in Figure 49 represent the configuration used to characterize

and qualify the ADL8143.

To set the IDQ, connect a resistor, R2, between the RBIAS and

VDD pins. A default value of 487 Ω is recommended that results

in a nominal IDQ of 35 mA. The RBIAS pin also draws a current

that varies with the value of RBIAS. Table 8 and Table 9 show the

recommended RBIAS values with the associated IDQ values. Do not

leave the RBIAS pin open.

Figure 49. Typical Application Circuit

RECOMMENDED BIAS SEQUENCING

The correct sequencing of the DC and RF power is required to

safely operate the ADL8143. During power-up, apply VDD before

the RF power is applied to RFIN, and during power-off, remove the

RF power from RFIN before VDD is powered off.

Table 8. Recommended Bias Resistor Values for Various IDQ Values,

VDD = 1.5 V

RBIAS (Ω)

IDQ (mA)

IDQ_AMP (mA)

IRBIAS (mA)

1171

20

19.1

0.9

835

25

23.8

1.2

629

30

28.5

1.5

487

35

33.1

1.9

398

40

37.8

2.2

329

45

42.4

2.6

Table 9. Recommended Bias Resistor Values for Various Supply Voltages,

IDQ = 35 mA

RBIAS (Ω)

VDD (V)

295

1.2

356

1.3

487

1.5

652

1.7

933

2.0

1494

2.5

2190

3.0

3091

3.5