SKY65008 Datasheet, PDF (7/11 Pages) Skyworks Solutions Inc. – 250 - 2700 MHz Linear, Low Current Power Amplifier Driver

PRELIMINARY DATA SHEET • SKY65008
Evaluation Board Description
The Skyworks SKY65008 Evaluation Board is used to test the
performance of the SKY65008 power amplifier driver. An
assembly drawing for the Evaluation Board is shown in Figure 10
and the layer detail is provided in Figure 11.
Circuit Design Configurations
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 SKY65008 power amplifier 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 amplifier. As such, design the connection to
the ground pad to dissipate the maximum wattage produced
to the circuit board. Multiple vias to the grounding layer are
required.
NOTE: Junction temperature (TJ) of the device increases with a
poor connection to the slug and ground. This reduces the
lifetime of the device.
A suggested matching circuit is shown in Figure 12 with
component values listed in Table 5.
Testing Procedure
Use the following procedure to set up the SKY65008 Evaluation
Board for testing:
1. Connect a 3.3 V supply to VCC. If available, enable the current
limiting function of the power supply to 240 mA.
2. 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.
3. Connect a spectrum analyzer to the RF signal output port.
4. Enable the power supply.
5. Enable the RF signal.
6. Take measurements.
CAUTION: If any of the output signals exceed the rated
maximum values, the SKY65008 Evaluation Board
can be permanently damaged.
JP1
J1 (RF In)
R1
C1 ^C2
R2
R3
L1
C3
C7
C8
C9
C5
L2 _C4
C6
Figure 10. Evaluation Board Assembly Drawing
J2 (RF Out)
S446
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
200292A • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • April 21, 2005
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