HMC8411LP2FE datasheet(19/23 Pages) AD

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Data Sheet

HMC8411LP2FE

Rev. A | Page 19 of 23

APPLICATIONS INFORMATION

The basic connections for operating the HMC8411LP2FE are

shown in Figure 70. AC couple the input and output of the

HMC8411LP2FE with appropriately sized capacitors. DC block

capacitors are supplied on the RFIN and RFOUT pin of the

evaluation board. A 5 V dc bias is supplied to the amplifier

through the choke inductor connected to the RFOUT pin.

The HMC8411LP2FE operates in self-bias mode when the RBIAS

pin is connected to a 1.1 kΩ external resistor to achieve a 55 mA

supply current.

Refer to Table 7 for the recommended resistor values to achieve

different supply currents.

RECOMMENDED BIAS SEQUENCING

During Power-Up

The recommended bias sequence during power-up follows:

1. Set VDD to 5 V.

2. Apply the RF signal.

During Power-Down

The recommended bias sequence during power-down follows:

1. Turn off the RF signal.

2. Set VDD to 0 V.

The bias conditions, VDD = 5 V and IDQ = 55 mA, are the

recommended operating point to achieve optimum performance.

The data used in this data sheet was taken with the recommended

bias conditions. Using the HMC8411LP2FE with different bias

conditions can provide different performance than what is

shown in the Typical Performance Characteristics section.

Table 7. Recommended Bias Resistor Values

RBIAS (Ω)

IDQ (mA)

Amplifier Current, IDQ_AMP (mA)

RBIAS Current, IDQ_BIAS (mA)

400

75.97

4.03

510

71.32

3.68

635

66.64

3.36

780

61.95

3.05

960

57.27

2.73

1100

52.47

2.53

1400

47.82

2.18

1800

43.16

1.84

2270

38.45

1.55

3000

33.75

1.25

4000

29.15

0.85

5700

24.93

0.07

9000

19.95

0.05

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