SKY65152 Datasheet, PDF (8/12 Pages) Skyworks Solutions Inc. – 2.4-2.5 GHz WLAN Power Amplifier

preliminary Data Sheet • SKY65152
Evaluation Board Description
The Skyworks SKY65152 Evaluation Board is used to test the
performance of the SKY65152 power amplifier module. The fol-
lowing 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 power amplifier module 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 amplifiers. As such, design the con-
nection to the ground pad to dissipate the maximum wattage
produced to the circuit. Multiple vias to the grounding layer are
required.
3. Bypass capacitors should be used on the DC supply lines. RF
inductor is required on the Vcc supply line to block RF signal
from the DC supply. See Evaluation Board schematic drawing
for more 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: J unction temperature (T_J) of the device increases with a
poor connection to the slug and ground. This reduces the
lifetime of the device.
4. Connect a spectrum analyzer to the RF signal output port.
5. Enable the power supply.
6. Enable the RF signal.
7. Take measurements.
CAUTION: If the input signal exceeds the rated power, the
SKY65152 Evaluation Board can be permanently
damaged.
NOTE: It is important that the V_CC voltage source be adjusted
such 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.
Evaluation Board
PA_ENB
V_{C_BIAS}
V_REF
GND
GND
V_CC1
V_{CC_DET}
V_DET
V_CC2
V_CC3
Evaluation Board Test Procedure
Use the following procedure to set up the SKY65152 evaluation
board for testing.
1. Connect a 5.0 V supply to V_CC1, V_CC2, V_CC3, V_REF1, V_REF2,
V_REF3, V_{C_BIAS}, V_{CC_DET}, PA_ENB. If available, enable the cur-
rent limiting function of the power supply of the V_CC supply to
850 mA.
2. If desired, connect a voltage meter to V_DET.
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, but do NOT enable the RF signal.
Recommended Solder Reflow Profiles
Refer to the “Recommended Solder Reflow Profile”
Application Note.
Tape and Reel Information
Refer to the “Discrete Devices and IC Switch/Attenuators
Tape and Reel Package Orientation” Application Note.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
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March 26, 2009 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • 200968 Rev. C