SKY66293-21 Datasheet, PDF (7/13 Pages) Skyworks Solutions Inc. – 3400 to 3800 MHz High-Efficiency 4 W Power Amplifier

DATA SHEET • SKY66293-21: 3400 TO 3800 MHz HIGH-EFFICIENCY 4 W POWER AMPLIFIER
Evaluation Board Description
The SKY66293-21 Evaluation Board is used to test the
performance of the SKY66293-21 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. Board layer details are shown in Figure 19. Layer detail
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 SKY66293-21 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 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.
VCC1
C12
C11
VCC2
C9
C10
1
2
3
4
5
6
7
8
8-Pin Header
J7
C1
SMA
L1
PAEN
VBIAS
VCC1
VCC2
VCC3
VBIAS
PAEN
U1
16 15 14 13
17 _{GND_PAD}
1 _GND
2 _RFIN
3 _GND1
4 _GND2
SKY66293
VCC3 ¹²
GND6 ¹¹
10
GND5
RFOUT ⁹
5 6 78
VCC3
C6
C7
C8
J8
RFOUT
C3
Note: The L1 component shown in this assembly is DNI.
C4
203905-017
Figure 17. SKY66293-21 Evaluation Board Schematic
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
203905D • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • May 31, 2017
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