DATA SHEET • SKY66299-11: 1900 TO 2000 MHz HIGH EFFICIENCY 4 W POWER AMPLIFIER

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

8

May 31, 2017 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 203291D

Evaluation Board Description

The SKY66299-11 Evaluation Board is used to test the

performance of the SKY66299-11 PA. An Evaluation Board

schematic is provided in Figure 20. Table 6 provides the Bill of

Materials (BOM) list for Evaluation Board components.

An assembly drawing for the Evaluation Board is shown in

Figure 21. Board layer details are shown in Figure 22. Layer detail

physical characteristics are noted in Figure 23.

Circuit Design Considerations

The following design considerations are general in nature and

must be followed regardless of final use or configuration:

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

 The ground pad of the SKY66299-11 has special electrical and

thermal grounding requirements. This pad is the main thermal

conduit for heat dissipation. Because 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.

NOTE: A poor connection between the ground pad and ground

device.

Evaluation Board Test Procedure

Turn-On Sequence

1. Connect 50

 Test Equipment or Load to the input and output

RF ports of the Evaluation Board.

2. Connect the DC ground.

3. Connect all VCCs and VBIAS lines to a +5 V supply. Connect

PAEN to a 2.0 V supply.

4. Without applying RF, turn on the 5 V supply, then turn on the 2

V PAEN.

5. Apply RF signal data at –30 dBm and observe that the gain of

the device is approximately 36 dB. Begin measurements.

Turn-Off Sequence

1. Turn off the RF input to the device.

2. Turn off PAEN (set to 0 V).

3. Turn off all VCCs and VBIAS.

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

+5 V is measured at the board. High collector currents drop the

collector voltage significantly if long leads are used. Adjust the

bias voltage to compensate.