SKY66291-11 Datasheet, PDF (7/14 Pages) Skyworks Solutions Inc. – 1805 to 1880 MHz High-Efficiency 4 W Power Amplifier

DATA SHEET • SKY66291-11: 1805 TO 1880 MHz HIGH-EFFICIENCY 4 W POWER AMPLIFIER
–20
–40 °C
–23
+25 °C
+85 °C
–26
–29
–32
–35
1805
1820
1835
1850
1865
1880
Frequency (MHz)
Figure 15. Input Return Loss vs Frequency Across Temperature
(Small Signal, PIN = –20 dBm)
–15
–40 °C
+25 °C
–18
+85 °C
–21
–24
–27
–30
1805
1820
1835
1850
1865
1880
Frequency (MHz)
Figure 16. Output Return Loss vs Frequency Across Temperature
(Small Signal, PIN = –20 dBm)
Evaluation Board Description
The SKY66291-11 Evaluation Board is used to test the
performance of the SKY66291-11 PA. An Evaluation Board
schematic is provided in Figure 17. Table 6 provides the Bill of
Materials (BOM) list for Evaluation Board components.
An assembly drawing for the Evaluation Board is shown in
Figure 18. Layer details are shown in Figure 19. Layer details
physical characteristics are noted in Figure 20.
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 SKY66291-11 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
increases junction temperature (TJ), which reduces the life of the
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 complies with the values in Table 5. 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.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
203161E • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • May 31, 2017
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