HMC8413 datasheet(18/21 Pages) AD

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HMC8413

Data Sheet

Rev. 0 | Page 18 of 21

APPLICATIONS INFORMATION

Figure 71 shows the basic connections for operating the

HMC8413. AC couple the input and output of the HMC8413

with appropriately sized capacitors (American Technical

Ceramics, 531Z104KTR16T). Use an appropriate bias tee on the

RFOUT/VDD pin to provide both ac and dc coupling to the

RFOUT/VDD pin. A 5 V dc bias is supplied to the amplifier through

the choke inductor connected to the RFOUT/VDD pin. The

recommended bias inductor is the Coilcraft® 0402DF-901XJRE,

0.9 μH.

The shunt resistor, inductor, capacitor (RLC) network on the

input of the HMC8413 adds resistive loss to help stabilize the

amplifier by reducing the gain at low frequencies. The shunt

inductor makes the resistor frequency dependent. At low

frequencies, the resistor becomes more active. The resistor has

less influence at higher frequencies where the impedance of the

choke is high. The capacitor blocks dc voltages and currents

from flowing through the resistor and the inductor.

The bias condition, VDD = 5 V and IDQ = 95 mA, is the

recommended operating point to achieve optimum performance.

To set other bias conditions, adjust the value of RBIAS. Table 7

shows the recommended bias resistor values and their associated

quiescent current.

HMC8413

GND

RFIN

RFOUT

0.1µF

VDD

0.1µF

0.14µH

0.9µH

GND

10pF

15Ω

787Ω

Figure 71. Typical Application Circuit

RECOMMENDED BIAS SEQUENCING

During Power-Up

The recommended bias sequence during power-up is as follows:

1. Set VDD to 5 V.

2. Apply the RF signal.

During Power-Down

The recommended bias sequence during power-down is as follows:

1. Turn off the RF signal.

2. Set VDD to 0 V.

Table 7. Recommended Bias Resistor Values

RBIAS (Ω)

Total Current,

IDQ (mA)

Amplifier Current,

IDQ_AMP (mA)

RBIAS Current,

IRBIAS (mA)

440

125

120.55

4.45

490

120

115.74

4.26

540

115

110.94

4.06

590

110

106.13

3.87

650

105

101.32

3.68

710

100

96.51

3.49

787

91.7

3.3

890

86.89

3.11

990

82.07

2.93

1100

77.26

2.74

1200

72.45

2.55

1360

67.63

2.37

1520

62.81

2.19

1700

57.99

2.01

1900

53.17

1.83

2240

48.36

1.64

2600

43.54

1.46

3080

38.72

1.28

3600

33.91

1.09

4780

29.12

0.88

6700

24.37

0.63

11900

19.62

0.38

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