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ADL5571-EVALZ

2.5 GHz to 2.7 GHz WiMAX Power Amplifier

Analog Devices 

EVALUATION BOARD

The ADL5571 performance data was taken on a FR4 board

layout. Care should be taken to ensure 50 Ω impedance for

all RF traces. For optimal performance in linearity, gain, and

efficiency, the output matching capacitor, C3, should be placed

35 mils from the edge of the package.

ADL5571

Figure 25. Evaluation Board Top Layer

Figure 26. Evaluation Board Bottom Layer

Table 6. Evaluation Board Configuration Options

Component

Function

VPOS, VPOS1, GND Supply and Ground Connections.

TP1 (STBY/PWDN)

TP2 (VREG)

Transmit/Standby Mode. When STBY is low (0 V), the device operates in transmit mode.

When the radio is receiving data, STBY can be taken high (2.5 V), reducing the supply

current to 9 mA.

Normal/Sleep Mode. When VREG is low, the device goes into sleep mode, reducing

the supply current to 10 μA. When VREG is high (2.85 V), the device operates in its

normal transmit mode and the VREG pin draws a bias current of approximately 9 mA.

L3

Input Interface. L3 matches the input to 50 Ω.

C3, C4

Output Interface. C4 provides dc blocking. C3 matches the output to 50 Ω.

C2, C10

C7, C8, C9, C11, C12

Filter Interface. A ground-referenced capacitor should be connected to this node to

reduce bias line noise.

Power Supply Decoupling. Capacitors C7 through C12 are used for power supply

decoupling. They should be placed as close as possible to the DUT.

L1, C6, L2, C5

RFIN, RFOUT

RF Trap. L1, C6 and L2, C5 form tank circuits and prevent RF from propagating on

the dc supply lines

RF Input and Output SMA Connections.

Default Value

W1 = installed

Not applicable

Not applicable

L3 = 2.7 nH (Size 0402)

C3 = 2.7 pF (Size 0402)

(C3 value for 2.5 GHz to

2.7 GHz operation, tight

tolerance recommended)

C4 = 39 pF (Size 0402)

C2 = 2.2 pF (Size 0402)

C10 = 0.01 μF (Size 0402)

C7 = 0.01 μF (Size 0402)

C8 = 0.01 μF (Size 0402)

C9 = 0.01 μF (Size 0402)

C11 = 1 μF (Size 0402)

C12 = 1 μF (Size 0402)

L1 = 1 nH (Size 0402)

C6 = 3.3 pF (Size 0402)

L2 = 11 nH (Size 0402)

C5 = Open

Rev. 0 | Page 13 of 16

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