sky65146-21 Skyworks Solutions, Inc., sky65146-21 Datasheet - Page 9

• Manufacturer Part Number: sky65146-21
• Description: Sky65146-21 806-849 Mhz, 3.5 V Broadband Power Amplifier
• Manufacturer: Skyworks Solutions, Inc.

Evaluation Board Description
The SKY65146-21 Evaluation Board is used to test the
performance of the SKY65146-21 PA. An Evaluation Board
schematic diagram is provided in Figure 31. Table 5 provides the
Bill of Materials (BOM) list for Evaluation Board components.
An assembly drawing for the Evaluation Board is shown in
Figure 32. Layer detail physical characteristics are noted in
Figure 33.
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 SKY65146-21 has special electrical
NOTE: A poor connection between the slug and ground increases
Figure 29. 3
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.
junction temperature (T
device.
+40
+39
+38
+37
+36
+35
+34
+33
+32
+31
+30
rd
+16
Over Frequency (Tone Spacing = 1 MHz)
Order Output Intercept Point vs Output Power/Tone
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
200810D • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • January 18, 2010
+18
Power Out/Tone (dBm)
+20
J
), which reduces the lifetime of the
+22
+24
806.0 MHz
815.5 MHz
825.0 MHz
850.0 MHz
890.0 MHz
930.0 MHz
+26
+28
Evaluation Board Test Procedure
Step 1: Connect RF test equipment to the Evaluation Board
Step 2: Connect DC ground.
Step 3: Connect VD2, VD3, and VD4 to a 3.5 V supply and VREG
Step 4: Apply RF signal data at a –30 dBm level and observe that
NOTE: It is important to adjust the VD2, VD3, and VD4 voltage
Figure 30. Power-Added Efficiency @ P1dB vs Frequency
source so that +3.5 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.
input/output SMA connectors.
to a 2.75 V supply. Verify that the current is
approximately 329 mA.
the output level is approximately +8 dBm and the gain of
the device is approximately 38 dB.
55
50
45
40
35
30
800
DATA SHEET • SKY65146-21 POWER AMPLIFIER
820
840
Frequency (MHz)
860
880
900
920
940
9