201192B

DATA SHEET
SKY65081-70LF: 2000-3000 MHz Low-Noise Power Amplifier
Driver
Applications
GND
 UHF television
 TETRA radios
4
 2.5G, 3G handsets
 ISM band transmitters
 WCS fixed wireless
 802.16 WiMAX
 3GPP LTE
Features
1
2
RF_IN
GND
3
RF_OUT
 Wideband frequency range: 2000 to 3000 MHz
 Low Noise Figure: 2.0 dB
 High linearity: IIP3 = +29.6 dBm
S244
Figure 1. SKY65081-70LF Pinout – 4-Pin SOT Package
(Top View)
 Output P1dB = +22.3 dBm
 High gain: 14.3 dB
Description
 Single DC supply: +5 V
Skyworks SKY65081-70LF is a high performance, ultra-wideband
Power Amplifier (PA) driver with superior output power, low noise,
linearity, and efficiency. The device provides a 2.0 dB Noise
Figure (NF) and a 1 dB Output Compression Point (OP1dB) of
+22.3 dBm, making the SKY65081-70LF ideal for use in the
driver stage of infrastructure transmit chains.
 On-chip bias circuit
 SOT-89 (4-pin, 2.4 x 4.5 mm) package (MSL1, 260 °C per
JEDEC J-STD-020)
Skyworks offers lead (Pb)-free RoHS (Restriction of
Hazardous Substances) compliant packaging.
The SKY65081-70LF uses low-cost Surface-Mount Technology
(SMT) in the form of a 4-pin, 2.4 x 4.5 mm Small Outline
Transistor (SOT) package. The device package and pinout are
shown in Figure 1 and a functional block diagram is provided in
Figure 2.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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1
DATA SHEET • SKY65081-70LF PA DRIVER
Active Bias
1
RF_IN
2
3
GND
RF_OUT
S669
Figure 2. SKY65081-70LF Functional Block Diagram
Table 1. SKY65081-70LF Signal Descriptions
Pin #
Name
Description
1
RF_IN
RF input
2
GND
Ground
3
RF_OUT
RF output
4
GND
Ground
Technical Description
Electrical and Mechanical Specifications
The SKY65081-70LF is a single stage, low-noise PA that operates
with a single 5 V power supply connected through an RF choke
(inductor L1) to the output signal (pin 3). The bias current is set by
the on-chip active bias composed of current mirror and reference
voltage transistors, which allow excellent gain tracking over
temperature and voltage variations. The device is externally RF
matched using surface mount components to facilitate operation
over a frequency range of 2000 to 3000 MHz.
Signal pin assignments and functional pin descriptions are
described in Table 1. The absolute maximum ratings of the
SKY65081-70LF are provided in Table 2. The recommended
operating conditions are specified in Table 3 and electrical
specifications are provided in Table 4.
Typical performance characteristics of the SKY65081-70LF are
illustrated in Figures 3 through 12.
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DATA SHEET • SKY65081-70LF PA DRIVER
Table 2. SKY65081-70LF Absolute Maximum Ratings
Parameter
Symbol
Min
Max
Units
Supply voltage
VCC
6
V
RF output power
POUT
+24
dBm
RF input power
PIN
+10
dBm
Supply current
ICC
100
mA
Power dissipation
PD
Operating case temperature
TC
–40
Storage temperature
TST
–55
Junction temperature
TJ
Note:
0.6
W
+85
°C
+125
°C
+150
°C
Exposure to maximum rating conditions for extended periods may reduce device reliability. There is no damage to device with only one parameter set at the limit and all other
parameters set at or below their nominal values. Exceeding any of the limits listed here may result in permanent damage to the device.
CAUTION: Although this device is designed to be as robust as possible, Electrostatic Discharge (ESD) can damage this device. This
device must be protected at all times from ESD. Static charges may easily produce potentials of several kilovolts on the
human body or equipment, which can discharge without detection. Industry-standard ESD precautions should be used at all
times.
Table 3. SKY65081-70LF Recommended Operating Conditions
Parameter
Symbol
Min
Typical
Max
Units
Supply voltage
VCC
4.75
5.0
5.5
V
Operating frequency
f
2000
2600
3000
MHz
Operating case temperature
TJ
–40
+25
+85
°C
Table 4. SKY65081-70LF Electrical Characteristics (Note 1)
(VCC = +5 V, TC = 25 °C, f = 2600 MHz, Unless Otherwise Noted)
Parameter
Symbol
Test Conditions
Min
Typical
2500
Max
Units
2700
MHz
Frequency
f
Small signal gain
G
PIN = –10 dBm
Input return loss
|S11|
PIN = –20 dBm
Output return loss
|S22|
PIN = –20 dBm
1 dB Output Compression Point
OP1dB
CW
1 dB Input Compression Point
IP1dB
Operating current @ OP1dB
ICC_OP1DB
Power Added Efficiency
PAE
@ OP1dB
30
44
%
Third order input intercept point
IIP3
PIN/tone = –10 dBm,
Δf = 1 MHz
+28.0
+29.6
dBm
Third order output intercept point
OIP3
PIN/tone = –10 dBm,
Δf = 1 MHz
+41.7
+43.9
dBm
Noise Figure
NF
Small signal
Quiescent current
ICCQ
No RF
13.7
14.3
dB
8.0
9.3
dB
10.0
12.5
dB
+21.0
+22.3
dBm
+8.3
+9.0
50
75
40
dBm
90
mA
2.0
2.5
dB
55
70
mA
Note 1: Performance is guaranteed only under the conditions listed in this Table.
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DATA SHEET • SKY65081-70LF PA DRIVER
–8
16.0
–10
15.5
–12
15.0
Gain (dB)
–14
–16
|S11| (dB)
|S22| (dB)
|S12| (dB)
–18
–20
–22
–24
2.50
2.55
2.60
2.65
2.70
4.8 V
5.0 V
5.2 V
14.5
14.0
13.5
13.0
12.5
12.0
2450
2500
2550
2600
2650
Frequency (GHz)
+45
3.0
+30
OIP3
IIP3
2.5
OIP3 (dBm)
Noise Figure (dB)
+44
2.0
1.5
1.0
2450
2500
2550
2600
2650
2700
+28
+42
+27
+41
+26
+40
2450
2750
2500
2550
2600
2650
2700
+25
2750
Frequency (MHz)
Figure 6. OIP3 vs Frequency
Figure 5. Noise Figure vs Frequency
–70
+30
–71
+29
IIP3 (dBm)
IM3 (dBm)
+29
+43
Frequency (MHz)
–72
–73
2500 MHz
2550 MHz
2600 MHz
2650 MHz
2700 MHz
+28
+27
–74
2450
2500
2550
2600
2650
2700
+26
–14
2750
–12
–10
–8
–6
–4
–2
PIN (dBm)
Frequency (MHz)
Figure 8. IIP3 vs Input Power Over Frequency
Figure 7. IM3 vs Frequency
(PIN = –10 dBm)
+25
+30
4.8 V
5.0 V
5.2 V
4.8 V
5.0 V
5.2 V
+24
OP1dB (dBm)
+29
IIP3 (dBm)
2750
Figure 4. Gain vs Frequency Over Voltage
Figure 3. Return Loss vs Frequency
+28
+27
+23
+22
+21
+26
+25
–14
–12
–10
–8
–6
–4
PIN (dBm)
Figure 9. IIP3 vs Input Power Over Voltage
–2
+20
2450
2500
2550
2600
2650
2700
Frequency (MHz)
Figure 10. OP1dB vs Frequency Over Voltage
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4
2700
Frequency (MHz)
IIP3 (dBm)
S-Parameters (dB)
–6
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2750
70
110
60
100
50
90
Current (mA)
PAE (%)
DATA SHEET • SKY65081-70LF PA DRIVER
40
30
20
4.8 V
5.0 V
5.2 V
10
0
0
+5
+10
+15
+20
+25
+30
80
70
60
4.8 V
5.0 V
5.2 V
50
40
–10
0
POUT (dBm)
Figure 11. PAE vs Output Power Over Voltage
Evaluation Board Description
The Skyworks SKY65081-70LF Evaluation Board is used to test
the performance of the SKY65081-70LF PA driver. An assembly
drawing for the Evaluation Board is shown in Figure 13 and the
layer detail is provided in Figure 14.
Capacitors C7, C8, and C9 provide DC bias decoupling for VCC.
Pins 1 and 3 are the RF input and output signals, respectively.
External DC blocking is required on the input and output, but can
be implemented as part of the RF matching circuit. Pin 2 and the
package backside metal, pin 4, are ground pins that provide the
DC and RF ground, respectively.
Circuit Design Configurations
The following design considerations are general in nature and
must be followed regardless of final use or configuration.
+10
+20
+30
POUT (dBm)
Figure 12. Current vs Output Power Over Voltage
1. Connect a 5.0 V supply to VCC. If available, enable the current
limiting function of the power supply to 100 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 SKY65081-70LF Evaluation
Board can be permanently damaged.
1. Paths to ground should be made as short as possible.
Package and Handling Information
2. The ground pad of the SKY65081-70LF 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.
Since the device package is sensitive to moisture absorption, it is
baked and vacuum packed before shipping. Instructions on the
shipping container label regarding exposure to moisture after the
container seal is broken must be followed. Otherwise, problems
related to moisture absorption may occur when the part is
subjected to high temperature during solder assembly.
NOTE: Junction temperature (Tj) of the device increases with a
poor connection to the slug and ground. This reduces the
lifetime of the device.
Care must be taken when attaching this product, whether it is
done manually or in a production solder reflow environment.
Production quantities of this product are shipped in a standard
tape and reel format. For packaging details, refer to the Skyworks
Application Note Tape and Reel, document number 101568.
A suggested matching circuit is shown in Figure 15 with
component values for the SKY65081-70LF-11 package option
listed in Table 5. Component values for the SKY65081-70LF-21
package option are shown in Table 6.
Testing Procedure
Use the following procedure to set up the SKY65081-70LF
Evaluation Board for testing:
The SKY65081-70LF is rated to Moisture Sensitivity Level 1
(MSL1) at 260 C. It can be used for lead or lead-free soldering.
Package Dimensions
Package dimensions for the 4-pin SOT-89 are shown in
Figure 16, and tape and reel dimensions are provided in
Figure 17.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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DATA SHEET • SKY65081-70LF PA DRIVER
GND
VCC
GND
GND
JP1
R1
C8
C7
C6
L2
J1 (RF In)
C1
C2
L1
C3
C4
L3
C5
L4
J2 (RF Out)
S708
Figure 13. Evaluation Board Assembly Drawing
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DATA SHEET • SKY65081-70LF PA DRIVER
Layer 1: Top - Metal
Layer 2: Ground
Layer 3: Ground
Layer 4: Solid Ground Plane
S1699
Figure 14. Evaluation Board Layer Detail
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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DATA SHEET • SKY65081-70LF PA DRIVER
VCC = 5 V
C1
C2
R1
C3
L1
4
M2
Input
M1
1
M3
3
M4
2
M6
M5
Output
M7
M8
S1377
Figure 15. SKY65081-70LF Evaluation Board Schematic
(2500 MHz to 2700 MHz, IIP3 Matched)
Table 5. SKY65081-70LF (SOT-89 Package) Evaluation Board Bill of Materials
Component
Size
Value
C1
0805
10 μF
C2
0603
2.7 pF
C3
0603
DNI
L1
0603
3.3 nH
M1
0603
DNI
M2
0603
1.0 pF
M3
0603
0Ω
M4
0603
DNI
M5
0603
DNI
M6
0603
8.2 nH
M7
0603
0Ω
M8
0603
DNI
R1
0603
0Ω
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DATA SHEET • SKY65081-70LF PA DRIVER
4.50 ± 0.10
0.381 ± 0.025
Sharp
R0.10
R0.25
1.70 ± 0.05
1.50
7o
2.44 ± 0.10
4.09 ± 0.10
0.51 ± 0.10
7o
R0.10
1.04 ± 0.15
0.46
1.50 ± 0.10
0.41
Side View
End View
Bottom View
S253
All measurements are in millimeters
Figure 16. SKY65081-70LF (4-Pin SOT-89) Package Dimensions
2.00 ± 0.05
8.00 ± 0.10
4.00 ± 0.10
∅1.50 ± 0.10
1.75 ± 0.10
0.30 ± 0.05
B
Pin #1
Indicator
7° Max
5.50 ± 0.05
12.0 ± 0.30
A
A
4.90 ± 0.10
B
1.90 ± 0.10
∅1.00 Min.
4.60 ± 0.10
B
Notes:
1. Carrier tape material: black conductive polycarbonate
2. Cover tape material: transparent conductive PSA
3. Cover tape size: 9.2 mm width
4. All measurements are in millimeters
8° Max
S264
Figure 17. SKY65081-70LF Tape and Reel Dimensions
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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DATA SHEET • SKY65081-70LF PA DRIVER
Ordering Information
Model Name
SKY65081-70LF Low Noise PA Driver
Ordering Part Number
SKY65081-70LF
Evaluation Kit Part Number
TW17-D630
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