DATA SHEET • SKY65152-11 POWER AMPLIFIER

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

200968F • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 19, 2009

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Evaluation Board Description

The SKY65152-11 Evaluation Board is used to test the

performance of the SKY65152-11 PA. An Evaluation Board

schematic diagram is provided in Figure 15. An assembly drawing

for the Evaluation Board is shown in Figure 16.

An Evaluation Board layer detail drawing is shown in Figure 17.

Layer detail physical characteristics are noted in Figure 18.

Table 5 provides the Bill of Materials (BOM) list for Evaluation

Board components.

Circuit Design Considerations

The following design considerations are general in nature and

must be followed regardless of final use or configuration:

1. Paths to ground should be made as short as possible.

2. The ground pad of the SKY65152-11 has special electrical

and thermal grounding requirements. This pad is the main

thermal conduit for heat dissipation. Since the circuit board

acts as the heat sink, it must shunt as much heat as possible

from the device. Therefore, design the connection to the

ground pad to dissipate the maximum wattage produced by

the circuit board. Multiple vias to the grounding layer are

required.

3. Bypass capacitors should be used on the DC supply lines. An

RF inductor is required on the VCC supply line to block RF

signals from the DC supply. Refer to the schematic drawing in

Figure 15 for further details.

4. The RF lines should be well separated from each other with

solid ground in between traces to maximize input-to-output

isolation.

NOTE: A poor connection between the slug and ground increases

device.

Evaluation Board Test Procedure

Step 1: Connect a +5 V supply to the VCC1, VCC2, VCC3, VREF1,

VREF2, VREF3, VC_BIAS, VCC_DET, and PA_ENB pins. If

available, enable the current limiting function of the

power supply to 1000 mA.

Step 2: If desired, connect a voltage meter to the V_DET pin.

Step 3: Connect a signal generator to the RF signal input port.

Set it to the desired RF frequency at a power level of

–15 dBm or less to the Evaluation Board. DO NOT enable

the RF signal.

Step 4: Connect a spectrum analyzer to the RF signal output port.

Step 5: Enable the power supply.

Step 6: Enable the RF signal.

Step 7: Take measurements.

CAUTION: If the input signal exceeds the rated power, the

SKY65152-11 Evaluation Board can be permanently

damaged.

NOTE: It is important to adjust the VCC voltage source so that

+5 V is measured at the board. The high collector currents

will drop the collector voltage significantly if long leads are

used. Adjust the bias voltage to compensate.

RF Input

1

2

3

4

5

6

78

9

10

16

17

18

19

20

15

14

13

12

11

PA Enable (0-5 V)

Bias Voltage (5 V)

Reference Voltage (5 V)

RF Output

C5

8.2 pF

R5

300

Ω

C15

10

μF

C8

8.2 pF

C16

10

μF

C7

8.2 pF

C6

3300 pF

C10

8.2 pF

C17

10

μF

GND

GND

PA_ENB

VC_BIAS

VREF1

VREF2

VCC1

VCC_DET

V_DET

VCC2

N/C

VCC3

L2

27 nH

Collector Voltage 1 (5 V)

Collector Voltage 2 (5 V)

Collector Voltage 3 (5 V)

Detector Supply Voltage (5 V)

Detector Output

S1502

C1

3300 pF

C2

3300 pF

C11

10

μF

R1

560

Ω

R2

180

Ω

R3

180

Ω

×

SKY65152-11

Figure 15. SKY65152-11 Evaluation Board Schematic