201084D.pdf

DATA SHEET
SKY65047-360LF: 0.4-3.0 GHz Low-Noise Amplifier
Applications
Description
• Wireless infrastructure: WLAN, WiMAX, broadband, cellular base
stations
The SKY65047-360LF is a high linearity Low-Noise Amplifier
(LNA). The excellent gain, superior low-noise and low current
consumption makes the SKY65047-360LF ideal for use in
wireless infrastructure applications. The device may also be used
in a variety of LNA applications. All active circuitry in the module is
contained in a single Microwave Monolithic Integrated Circuit
(MMIC).
• Test instrumentation
• Satellite receivers
• Paging
• Remote metering
• WLL and ISM receivers
• GPS receivers
Features
• Noise Figure = 1.2 dB @ 915 MHz
• Noise Figure = 0.8 dB @ 1575 MHz
• Noise Figure = 1.1 dB @ 2450 MHz
• Small signal gain = 16.6 dB @ 1575 MHz
The device is manufactured with an advanced silicon germanium
(SiGe) process, which allows a single supply operation while
maintaining excellent low-noise performance and linearity. The
SKY65047-360LF is provided in a low-cost, miniature 2 x 2 mm
Dual Flat No-Lead (DFN) package.
A functional block diagram is shown in Figure 1. The pin
configuration and package are shown in Figure 2. Signal pin
assignments and functional pin descriptions are provided in
Table 1.
• Low operating current = 7.2 mA
• External, adjustable bias setting
• Built-in power-down control
• Single DC supply voltage, 2.7 V to 3.8 V
• Miniature DFN (8-pin, 2 x 2 mm) package (MSL1, 260 °C per
JEDEC J-STD-020)
Figure 1. SKY65047-360LF Block Diagram
Figure 2. SKY65047-360LF Pinout – 8-Pin DFN
(Top View)
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DATA SHEET • SKY65047-360LF LOW NOISE AMPLIFIER
Table 1. SKY65047-360LF Signal Descriptions
Pin #
Name
Description
Pin #
Name
Description
1
GND
Ground
5
VBIAS
VCC bias voltage
2
RF_IN
RF input
6
BIAS_R
Bias reference voltage
3
GND
Ground
7
RF_OUT/BIAS
RF output/VCC bias
4
GND
Ground
8
EN
Amplifier enable control
Functional Description
The SKY65047-360LF includes an internal PA enable (pin 8, EN)
for fast RF on/off control. A logic low voltage level disables the PA;
a logic high voltage level enables the PA.
The SKY65047-360LF is a single stage, low noise amplifier in a
low-cost surface mount package. The device operates with a
single +3.3 V power supply connected through an RF choke to the
output pin. Surface mount capacitors provide DC bias decoupling
for VCC.
Electrical and Mechanical Specifications
The absolute maximum ratings of the SKY65047-360LF are
provided in Table 2. The recommended operating conditions are
specified in Table 3 and electrical specifications are provided in
Table 4.
The bias current is set by a reference voltage transistor and by
resistor R1. Pin 2 (RF_IN) is the RF input and Pin 7 (RF-OUT/BIAS)
is the RF output. The part is externally RF matched and DC
blocked using surface mount components to facilitate operation
over a frequency range of 0.4 to 3.0 GHz. Pins 1, 3, and 4, and the
package backside metal provide the DC and RF ground.
Typical performance characteristics for the SKY65047-360LF are
illustrated in Figures 3 through 8.
Table 2. SKY65047-360LF Absolute Maximum Ratings
Maximum
Units
Supply voltage
Parameter
VCC
4
V
Total supply current
IBIAS
20
mA
RF input power
PIN
+20
dBm
Storage temperature
TSTG
+125
°C
Junction temperature
TJ
Case temperature
TCASE
Note:
Symbol
Minimum
Typical
–65
–40
+125
°C
+85
°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 value.
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. SKY65047-360LF Recommended Operating Conditions
Parameter
Symbol
Minimum
Frequency
f
RF input power
PIN
Bias supply voltage (Note 1)
VBIAS
2.7
Amplifier enable control (on)
EN_ON
Amplifier enable control (off)
EN_OFF
Operating temperature
TOP
Typical
0.4
Maximum
3.0
GHz
–20
dBm
3.8
V
VCC–0.3
VCC
V
0
0.2
V
+85
°C
–40
3.3
+25
Note 1: Voltage applied to pin 5 (VBIAS) and pin 7 (RF_OUT/BIAS).
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Units
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DATA SHEET • SKY65047-360LF LOW NOISE AMPLIFIER
Table 4. SKY65047-360LF Electrical Specifications (Note 1) (1 of 2)
(VBIAS and EN = 3.3 V, Characteristic Impedance [ZO] = 50 Ω, TCASE = 25 °C, Unless Otherwise Noted)
Parameter
Symbol
Test Condition
Min
Typical
Max
Units
450 MHz Matched Performance
Gain
G
Gain variation over temperature
G
25 °C to –40 °C or 25 °C
to +85 °C
19.6
dB
±0.5
dB
Isolation
Iso
–32.7
dB
Noise Figure
NF
1.4
dB
Noise Figure variation over temperature
NF
±0.3
dB
3rd Order Input Intercept Point
IIP3
–6
dBm
±0.7
dB
rd
25 °C to –40 °C or 25 °C
to +85 °C
3 Order Input Intercept Point variation over
temperature
IIP3
25 °C to –40 °C or 25 °C
to +85 °C
Input return loss
IRL
With external matching
14
dB
Output return loss
ORL
With external matching
15
dB
Supply current
ICC
Bias resistor = 4.7 kΩ
6.9
mA
17
dB
25 °C to –40 °C or 25 °C
to +85 °C
±0.4
dB
915 MHz Matched Performance
Gain
G
Gain variation over temperature
G
Isolation
Iso
28
dB
Noise Figure
NF
1.2
dB
Noise Figure variation over temperature
NF
±0.2
dB
1 dB Input Compression Point
IP1dB
–16.5
dBm
rd
25 °C to –40 °C or 25 °C
to +85 °C
3 Order Input Intercept Point
IIP3
PIN = –30 dBm/tone,
200 kHz spacing
+0.8
dBm
3rd Order Input Intercept Point variation over
temperature
IIP3
25 °C to –40 °C or 25 °C
to +85 °C
±0.5
dB
Input return loss
IRL
With external matching
15.5
dB
Output return loss
ORL
With external matching
12.7
dB
Supply current
ICC
Bias resistor = 4.7 kΩ
6.5
mA
16.6
dB
±0.6
dB
1575 MHz Matched Performance
Gain
G
Gain variation over temperature
G
Isolation
Iso
Noise Figure
NF
Noise Figure variation over temperature
NF
1 dB Input Compression Point
IP1dB
rd
25 °C to –40 °C or 25 °C
to +85 °C
22
26
0.8
25 °C to –40 °C or 25 °C
to +85 °C
3 Order Input Intercept Point
IIP3
PIN = –30 dBm/tone,
200 kHz spacing
3rd Order Input Intercept Point variation over
temperature
IIP3
25 °C to –40 °C or 25 °C
to +85 °C
dB
1.2
dB
±0.3
dB
–18.4
–15.8
dBm
+1.0
+3.2
dBm
±0.8
dB
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DATA SHEET • SKY65047-360LF LOW NOISE AMPLIFIER
Table 4. SKY65047-360LF Electrical Specifications (Note 1) (2 of 2)
(VBIAS and EN = 3.3 V, Characteristic Impedance [ZO] = 50 Ω, TCASE = 25 °C, Unless Otherwise Noted)
Parameter
Symbol
Test Condition
Min
Typical
14.5
Max
Units
1575 MHz Matched Performance (continued)
Input return loss
IRL
With external matching
10.0
Output return loss
ORL
With external matching
10
Supply current
ICC
Bias resistor = 4.7 kΩ
dB
12
dB
7.2
mA
15.9
dB
±0.3
dB
1900 MHz Matched Performance
Gain
G
Gain variation over temperature
G
25 °C to –40 °C or 25 °C
to +85 °C
Isolation
Iso
22
dB
Noise Figure
NF
1.3
dB
Noise Figure variation over temperature
NF
±0.2
dB
1 dB Input Compression Point
IP1dB
–12.8
dBm
rd
25 °C to –40 °C or 25 °C
to +85 °C
3 Order Input Intercept Point
IIP3
3rd Order Input Intercept Point variation over
temperature
IIP3
25 °C to –40 °C or 25 °C
to +85 °C
+4.7
dBm
±0.4
dB
Input return loss
IRL
With external matching
18
dB
Output return loss
ORL
With external matching
23
dB
Supply current
ICC
Bias resistor = 4.7 kΩ
7.1
mA
14.8
dB
25 °C to –40 °C or 25 °C
to +85 °C
±0.3
dB
2450 MHz Matched Performance
Gain
G
Gain variation over temperature
G
Isolation
Iso
21
dB
Noise Figure
NF
1.1
dB
Noise Figure variation over temperature
NF
25 °C to –40 °C or 25 °C
to +85 °C
±0.2
dB
1 dB Input Compression Point
IP1dB
–9.6
dBm
3rd Order Input Intercept Point
IIP3
PIN = –30 dBm/tone,
200 kHz spacing
+7.5
dBm
3rd Order Input Intercept Point variation over
temperature
IIP3
25 °C to –40 °C or 25 °C
to +85 °C
±0.3
dB
Input return loss
IRL
With external matching
14
dB
Output return loss
ORL
With external matching
16
dB
Supply current
ICC
Bias resistor = 4.7 kΩ
6.4
mA
ILKG
No RF
0.1
μA
Power-Down
Leakage current
Note 1: Performance is guaranteed only under the conditions listed in this Table.
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DATA SHEET • SKY65047-360LF LOW NOISE AMPLIFIER
Typical Performance Characteristics
(VBIAS and EN = 3.3 V, Characteristic Impedance [ZO] = 50 Ω, TCASE = 25 °C, Unless Otherwise Noted)
Figure 3. Gain Over Temperature and Frequency
Figure 4. Gain Over Supply Voltage and Frequency
Figure 5. IIP3 Over Temperature and Frequency
Figure 6. IIP3 Over Supply Voltage and Frequency
Figure 7. Noise Figure Over Temperature and Frequency
Figure 8. Noise Figure Over Supply Voltage and Frequency
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DATA SHEET • SKY65047-360LF LOW NOISE AMPLIFIER
Evaluation Board Description
The SKY65047-360LF Evaluation Board is used to test the
performance of the SKY65047-360LF LNA. Three different boards
are available, depending on the desired performance frequency:
915 MHz, 1575 MHz, and 2450 MHz.
Evaluation Board schematic diagrams are provided in Figures 9,
11, and 13. Assembly drawings for the Evaluation Board are
shown in Figures 10, 12, and 14.
reasons. Multiple small vias are acceptable and will work well
under the device if solder migration is an issue.
GND (pins 1, 3, and 4). Attach all ground pins to the RF ground
plane with the largest diameter and lowest inductance via that the
layout allows. Multiple small vias are acceptable and will work
well under the device if solder migration is an issue. Pin 3 can
also be connected to ground with a small inductance of emitter
degeneration.
RF_IN (pin 2). The LNA requires a DC blocking capacitor as part
of the external RF matching.
Evaluation Board layer detail drawings for the 915 MHz,
1575 MHz, and 2450 MHz boards are shown in Figures 15, 16,
and 17, respectively. Layer detail physical characteristics are
noted in Figure 18.
VBIAS (pin 5). The bias supply voltage for the LNA is typically set
to +3.3 V using a bias resistor.
Circuit Design Considerations
BIAS_R (pin 6). This pin is typically connected to ground through
a bias resistor.
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 SKY65047-360LF 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 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 slug and ground increases
junction temperature (TJ), which reduces the lifetime of the
device.
Evaluation Board Test Procedure
Step 1: Connect RF test equipment to amplifier input/output SMA
connectors.
Step 2: Connect DC ground.
Step 3: Connect VCC to a +3.3 V supply. Verify that the board
draws approximately 6.7 mA.
Step 4: Connect pin 8 (EN) to a +3.3 V supply to enable the LNA.
Set EN to 0 V to disable the LNA.
Step 5: Apply an RF input signal of –40 dBm and observe the
output signal level. This level should be approximately
–23.5 dBm with a gain equal to approximately 16.5 dB.
Application Circuit Notes
RF_OUT/BIAS (pin 7). The LNA collector supply voltage is
supplied through an RF choke (component L3 on the 915 MHz and
2450 MHz Evaluation Boards, and component L2 on the 1575 MHz
Evaluation Board) to the output at pin 7. The LNA requires a DC
blocking capacitor as part of the external RF matching.
EN (pin 8). A logic low voltage level disables the internal PA; a
logic high voltage level enables the internal PA.
Package Dimensions
The PCB layout footprint for the SKY65047-360LF is shown in
Figure 19. Typical case markings are shown in Figure 20.
Package dimensions for the 8-pin DFN are shown in Figure 21,
and tape and reel dimensions are provided in Figure 22.
Package and Handling Information
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.
THE SKY65047-360LF is rated to Moisture Sensitivity Level 1
(MSL1) at 260 °C. It can be used for lead or lead-free soldering.
For additional information, refer to the Skyworks Application Note,
Solder Reflow Information, document number 200164.
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.
Center Ground. It is extremely important to sufficiently ground the
bottom ground pad of the device for both thermal and stability
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DATA SHEET • SKY65047-360LF LOW NOISE AMPLIFIER
Figure 9. SKY65047-360LF Evaluation Board Schematic
(915 MHz)
Figure 10. SKY65047-360LF Evaluation Board Assembly Diagram
(915 MHz)
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DATA SHEET • SKY65047-360LF LOW NOISE AMPLIFIER
Figure 11. SKY65047-360LF Evaluation Board Schematic
(1575 MHz)
Figure 12. SKY65047-360LF Evaluation Board Assembly Diagram
(1575 MHz)
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DATA SHEET • SKY65047-360LF LOW NOISE AMPLIFIER
Figure 13. SKY65047-360LF Evaluation Board Schematic
(2450 MHz)
Figure 14. SKY65047-360LF Evaluation Board Assembly Diagram
(2450 MHz)
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DATA SHEET • SKY65047-360LF LOW NOISE AMPLIFIER
Figure 15. SKY65047-360LF Evaluation Board Layer Detail
(915 MHz)
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DATA SHEET • SKY65047-360LF LOW NOISE AMPLIFIER
Figure 16. SKY65047-360LF Evaluation Board Layer Detail
(1575 MHz)
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DATA SHEET • SKY65047-360LF LOW NOISE AMPLIFIER
Figure 17. SKY65047-360LF Evaluation Board Layer Detail
(2450 MHz)
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DATA SHEET • SKY65047-360LF LOW NOISE AMPLIFIER
Figure 18. Layer Detail Physical Characteristics
Figure 19. SKY65047-360LF PCB Layout Footprint
(Top View)
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DATA SHEET • SKY65047-360LF LOW NOISE AMPLIFIER
Figure 20. Typical Case Markings
(Top View)
Figure 21. SKY65047-360LF 8-Pin DFN Package Dimensions
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DATA SHEET • SKY65047-360LF LOW NOISE AMPLIFIER
Figure 22. SKY65047-360LF Tape and Reel Dimensions
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DATA SHEET • SKY65047-360LF LOW NOISE AMPLIFIER
Ordering Information
Model Name
SKY65047-360LF Low Noise Amplifier
Manufacturing Part Number
SKY65047-360LF
Evaluation Board Part Number
TW17-D900 (915 MHz)
TW17-D910 (1575 MHz)
TW17-D920 (2450 MHz)
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