Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201107C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • November 12, 2009 1
DATA SHEET
SKY65084-360LF: 1.5-2.4 GHz Low Noise Amplifier
Applications
xWireless infrastructure: GSM, CDMA, WCDMA, and TD-SCDMA
xUltra low-noise applications
Features
xUltra-low Noise Figure = 0.70 dB @ 1.95 GHz
xExcellent input and output return loss
xAdjustable gain = 15 to 25 dB @ 1.95 GHz
xHigh output OIP3 = +34.0 dBm @ 65 mA
xOP1dB = +16 dBm @ 1.95 GHz
xSingle, positive DC supply voltage
xAdjustable supply current, 30 to 100 mA
xSmall, QFN (8-pin, 2 x 2 mm) package (MSL1, 260 qC per
JEDEC J-STD-020)
Inter-
Stage
Match
Figure 1. SKY65084-360LF Block Diagram
Description
The SKY65084-360LF is a high performance, two-stage ultra low-
noise amplifier. The device is fabricated from Skyworks advanced
pHEMT process and is provided in a 2 x 2 mm, 8-pin Quad Flat
No-Lead (QFN) package.
The device features excellent input and output return loss, and an
integrated interstage matching network. The amplifier’s ultra-low
Noise Figure (NF), high gain, and excellent 3rd Order Intercept
point (IP3) allow it to be used in various receiver and transmitter
applications.
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.
4
3
2
1
5
6
7
8
VDD1
RFIN
BIAS1
BIAS2
N/C
RFOUT/VDD2
N/C
FEEDBACK
Figure 2. SKY65084-360LF Pinout – 8-Pin QFN
(Bottom View)
DATA SHEET • SKY65084-360LF LOW NOISE AMPLIFIER
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Table 1. SKY65084-360LF Signal Descriptions
Pin # Name Description Pin # Name Description
1 VDD1 1st stage DC power supply 5 FEEDBACK Connect to RFOUT to reduce gain of 2nd
stage transistor
2 RFIN RF input 6 N/C No connection
3 BIAS1 Source lead for 1st stage transistor 7 RFOUT/VDD2 RF output. Requires a DC bias using an RF
choke inductor.
4 BIAS2 Source lead for 2nd stage transistor 8 N/C No connection
5
6
7
8
4
3
2
1
S1500
Inter-Stage
Match
Figure 3. SKY65084-360LF On-Die Functional Diagram
Functional Description
The SKY65084-360LF is a two stage, low noise amplifier with an
integrated interstage matching network. The device has a tested
low NF of 0.70 dB and gain of 24 dB. The device allows designers
to adjust current and gain without degrading the NF.
The external matching network largely dictates the RF
performance of the device. The matching network is required for
operation and special care should be taken when designing a
circuit board layout for the SKY65084-360LF. There are four
separate groups of external components: input, output, biasing,
and feedback. Figure 3 illustrates the circuit-on-die inside the
2 x 2 mm QFN package.
Biasing
To properly bias a depletion mode pHEMT, both the gate and
drain of the device must be biased properly. At VGS = 0 V and
VDS > 2 V, the amplifier stage is in its saturated state and draws
the maximum amount of current, IDSS. A VDS of 5 V is
recommended to ensure proper performance.
To eliminate the need for a negative DC supply, self-biasing
should be used when a resistor is placed between one of the
source leads and ground. A bypass capacitor should be placed in
parallel to this resistor to provide an RF ground and to ensure
performance remains unchanged at the operating frequency.
When current flows from drain to source and through the resistor,
the source voltage becomes biased above DC ground. The gate
pin of the device should be left unbiased at 0 V, which creates the
desired negative VGS value. This simplifies the design by
eliminating the need for a second DC supply. Values for resistor
components R1 and R2 can be changed to easily increase or
decrease the bias current to a desired level.
The first stage is biased at 20 percent of IDSS to achieve the best
NF performance. The gain and current of the 2nd stage amplifier
can be adjusted without degrading the overall NF. More current in
the 2nd stage yields better IP3 performance.
Components L3 and L4 are the RF bias choke inductors (refer to
Figure 18). These are required to block RF power and pass VDD to
the drain of each amplifier stage. Components C5, C6, C7, C9,
and C10 are RF bypass capacitors. R3 and R4 reduce the voltage
presented at the drain of each stage of the device. The resistor
values are optimized for 3rd Order Output Intercept Point (OIP3)
and P1dB performance.
DATA SHEET • SKY65084-360LF LOW NOISE AMPLIFIER
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Source Inductance
The effect of source inductance varies with frequency. Too little
source inductance increases gain and high frequency stability, but
at the cost of more in-band instability. Too much source
inductance decreases high frequency stability and gain, but
improves in-band instability. It is very important to find the
optimum tuning of source inductance that balances all variables.
The board trace present on the first stage transistor (pin 3) is
about 60 mils long and 6 mils wide. The electrical length of the
line is 9.8 degrees at 1950 MHz. When designing a board for the
SKY65084-360LF, these exact dimensions should be used. The
board trace length at pin 4 should be minimized.
Input and Output RF Matching Network
The input band-pass matching network consists of four
components. Component C1 serves as the input DC blocking
capacitor, C2 provides high frequency stability and improved input
return loss, and L1 and L2 are responsible for the best noise
match looking into the gate of the first stage amplifier.
Excess board trace should be eliminated at the input of the device
to minimize board losses. High-Q components should be used to
achieve the best NF of the amplifier. Murata GJM series
capacitors and Coilcraft HP series inductors are recommended.
Any excess board or component loss on the input of the device
directly adds to the total measured NF.
The output matching network is band-pass network optimized for
output return loss and OIP3 performance. No High-Q components
are required for output matching or DC bias.
Feedback
Using feedback on the SKY65084-360LF is not necessary, but
can be used to reduce gain without affecting other parameters.
The default circuit configuration has 25 dB of gain, but can be
decreased to about 18 dB by adding feedback components.
Measuring NF
Special care should be taken when making < 1 dB NF
measurements. Ideally, measurements should be made in an RF
shield room. An Agilent MXA N9020A spectrum analyzer with an
internal pre-amp paired with an N4001A smart noise source was
used for all noise measurements. The smart noise source has an
internal thermocouple that automatically sets the TCOLD setting on
the analyzer. If a smart noise source is unavailable, a standard
noise source should be used. Use an external thermocouple to
manually adjust the TCOLD setting to ensure accurate results.
Electrical and Mechanical Specifications
The absolute maximum ratings of the SKY65084-360LF are
provided in Table 2. The recommended operating conditions are
specified in Table 3 and electrical specifications are provided in
Table 4.
Performance characteristics for the SKY65084-360LF are
illustrated in Figures 4 through 10.
Table 2. SKY65084-360LF Absolute Maximum Ratings
Parameter Symbol Minimum Typical Maximum Units
Supply voltage VDD 5.5 V
Input power PIN +13 dBm
Supply current stage one IDS1 50 mA
Supply current stage two IDS2 100 mA
Power dissipation PDIS 530 mW
Junction temperature TJ 150 qC
Storage temperature TSTG –65 +125 qC
Operating temperature TOP –40 +85 qC
Thermal resistance ΘJC 47 qC/W
Note: 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. 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.
DATA SHEET • SKY65084-360LF LOW NOISE AMPLIFIER
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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Table 3. SKY65084-360LF Recommended Operating Conditions
Parameter Symbol Minimum Typical Maximum Units
Operating frequency f 1.5 2.4 GHz
Supply voltage VDD 4.75 5.00 5.25 V
Supply current IDD 30 65 100 mA
Table 4. SKY65084-360LF Electrical Specifications (Note 1)
(TOP = +25
q
C, Characteristic Impedance [ZO] = 50
Ω
, VDD = 5 V, IDD = 65 mA, f = 1950 MHz, Parameters Include Recommended Matching
Networks, Unless Otherwise Noted)
Parameter Symbol Test Condition Min Typical Max Units
Noise Figure (Note 2) NF 0.7 1.0 dB
Small signal gain |S21| 23.5 24.0 24.5 dB
Input return loss |S11| 20 dB
Output return loss |S22| 20 dB
Reverse isolation |S12| 36 dB
3rd Order Input Intercept Point IIP3 5 MHz spacing,
PIN = –18 dBm per tone,
f = 2000 MHz
+10 dBm
3rd Order Output Intercept Point OIP3 5 MHz spacing,
PIN = –18 dBm per tone,
f = 2000 MHz
+34.0 dBm
1 dB Input Compression Point IP1dB f = 2000 MHz –7 dBm
1 dB Output Compression Point OP1dB f = 2000 MHz +16 dBm
Stability K Unconditionally stable up
to 18 GHz
>1 –
Note 1: Performance is guaranteed only under the conditions listed in this Table and is not guaranteed over the full operating or storage temperature ranges. Operation at elevated
temperatures may reduce reliability of the device.
Note 2: Loss from input RF connector and board trace de-embedded from measurement.
Typical Performance Characteristics
(TOP = +25
q
C, Characteristic Impedance [ZO] = 50
Ω
, VDD = 5 V, IDD = 65 mA, Parameters Include a Recommended High Gain
1950 MHz Matching Network, Unless Otherwise Noted)
15
20
25
10
5
0
30
1500 1700 1900 2100 2300 2500
Frequency (MHz)
Small Signal Gain (dB)
+85 oC
+25 oC
–40 oC
Figure 4. Small Signal Gain vs Frequency Over Temperature,
PIN = –20 dBm
–15
–10
–5
–20
–25
–30
–35
–40
0
1500 1700 1900 2100 2300 2500
Frequency (MHz)
Input Return Loss (dB)
+85
o
C
+25
o
C
–40
o
C
Figure 5. Intput Return Loss vs Frequency Over Temperature,
PIN = –20 dBm
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–30
–20
–10
–40
–50
–60
0
1500 1700 1900 2100 2300 2500
Frequency (MHz)
Reverse Isolation (dB)
+85
o
C
+25
o
C
–40
o
C
Figure 6. Reverse Isolation vs Frequency Over Temperature,
PIN = –20 dBm
0.6
0.8
1.0
0.4
0.2
0
1.2
1700 1800 1900 2000 2100
Frequency (MHz)
NF (dB)
+85
o
C
+25
o
C
–40
o
C
Figure 8. Noise Figure vs Frequency Over Temperature, Input RF
Connector and Board Trace De-Embedded From Measurement
–15
–10
–5
–20
–25
–30
0
1500 1700 1900 2100 2300 2500
Frequency (MHz)
Output Return Loss (dB)
+85 oC
+25 oC
–40 oC
Figure 7. Output Return Loss vs Frequency Over Temperature,
PIN = –20 dBm
+32
+34
+36
+30
+28
+38
1700 1800 1900 2000 2100
Frequency (MHz)
OIP3 (dBm)
+85
o
C
+25
o
C
–40
o
C
Figure 9. Third Order Output Intercept Point vs Frequency
Over Temperature,
PIN = –18 dBm/Tone, 5 MHz Tone Spacing
–5.5
–5.0
–4.5
–6.0
–6.5
–7.0
–7.5
–8.0
–4.0
1700 1800 1900 2000 2100
Frequency (MHz)
IP1dB (dBm)
+85 oC
+25 oC
–40 oC
Figure 10. Input 1 dB Compression vs Frequency Over Temperature
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Evaluation Board Description
The SKY65084-360LF Evaluation Board is used to test the
performance of the SKY65084-360LF low noise amplifier. An
assembly drawing for the Evaluation Board is shown in Figure 11
and an Evaluation Board schematic diagram is shown in
Figure 12. Table 5 provides the Evaluation Board Bill of Materials
(BOM) list.
Input and output traces have been minimized to reduce losses. All
surface mount components are 0402-sized to reduce component
parasitics. The use of 0603 or larger components is not
recommended. Component spacing has also been minimized. The
board is provisioned with two RF connectors and a DC launch.
The RF connector and board loss up to component C1 is
approximately 0.1 dB at 1.95 GHz.
It is very important to place multiple ground vias as close to shunt
components as possible. This ensures proper grounding and
circuit performance.
Board material is 10 mil thick VT47 FR4 with 1 oz. copper
cladding. RF traces are 50 Ω with a 17.5 mil trace width and a
10 mil gap to ground.
Evaluation Board Test Procedure
Step 1: Connect RF test equipment to amplifier input/output SMA
connectors.
Step 2: Connect DC ground.
Step 3: Connect VDD to a +5 V supply with a current limit of
100 mA. Verify that the board draws approximately
65 mA.
Step 4: Apply RF signal or noise source.
Package Dimensions
The PCB layout footprint for the SKY65084-360LF is shown in
Figure 13. Typical case markings are noted in Figure 14. Package
dimensions for the 8-pin QFN are shown in Figure 15, and tape
and reel dimensions are provided in Figure 16.
Package and Handling Information
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 SKY65084-360LF is rated to Moisture Sensitivity Level 1
(MSL1) at 260 qC. 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. For packaging details, refer to the Skyworks
Application Note, Discrete Devices and IC Switch/Attenuators
Tape and Reel Package Orientation, document number 200083.
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201107C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • November 12, 2009 7
C1
R3
R4
L2
R5
C11 L4
L3
C6
C5
C9
C3
R1 C4
R2
C8 L5
C10
C7
L1
C2
S1577
C1, L1, and L2 comprise the input matching network
C8, L4, and L5 comprise the output matching network.
R1, R3, and C3 are the bias components for the 1st stage transistor.
R2, R4, and C4 are the bias components for the 2nd stage transistor.
C3, C4, C6, C7, C9, and C10 are RF decoupling capacitors.
L3 and L4 are RF choke inductors.
R5 and C11 provide RF feedback to adjust gain
Figure 11. SKY65084-360LF Evaluation Board Assembly Diagram
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RF Input RF Output
1
2
3
4
VDD1
RFIN
BIAS1
BIAS2
N/C
RFOUT/VDD2
N/C
FEEDBACK
5
6
7
8
S1576
SKY65084
C5
VDD
L3
L2
L1
C2
C1
L4
L5
R3 R4
R2
C6
C4
C11
R5
C8
C7 C10
C9
×
×
R1 C3
Figure 12. SKY65084-360LF Evaluation Board Schematic Diagram
Table 5. Recommended Evaluation Board Bill of Materials
Component Value Size Manufacturer Component Value Size Manufacturer
C1 20 pF 0402 Murata GJM series L1 5.6 nH 0402 Coilcraft HP series
C2 0.4 pF 0402 Murata GJM series L2 7.5 nH 0402 Coilcraft CS series
C3 1000 pF 0402 Murata GRM series L3 6.8 nH 0402 TDK MLG series
C4 1000 pF 0402 Murata GRM series L4 18 nH 0402 TDK MLG series
C5 8.2 pF 0402 Murata GRM series L5 4.7 nH 0402 TDK MLG series
C6 0.3 pF 0402 Murata GJM series R1 20 Ω 0402 Panasonic
C7 1000 pF 0402 Murata GRM series R2 9.1 Ω 0402 Panasonic
C8 47 pF 0402 Murata GRM series R3 120 Ω 0402 Panasonic
C9 1000 pF 0402 Murata GRM series R4 36 Ω 0402 Panasonic
C10 0.3 pF 0402 Murata GJM series R5 1.1 kΩ 0402 Panasonic
C11 0.3 pF 0402 Murata GJM series
DATA SHEET • SKY65084-360LF LOW NOISE AMPLIFIER
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Exposed Solder Areas
(Typical)
0.25
0.50 Pitch
R0.20
Pin 1
8X 0.25
2X 0.45
2X 0.85
8X 0.70
8X 0.45
All dimensions are in millimeters
S1413
Figure 13. SKY65084-360LF PCB Layout Footprint
Pin 1
Indicator
Skyworks Part #
S84
Figure 14. Typical Case Markings
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10 November 12, 2009 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201107C
Top View Side View Bottom View
0.15 C
Pin 1
Indicator
2X
0.15 C
2X
R0.12 Typ
R0.20
0.08 C
8X 3
5
C
0.10
2
2
0.5
0.25
A
C
0.20 Ref
Seating Plane
Detail B
2 Places
Detail C
Detail A
0.02 +0.03/–0.02
0.45 +0.05/–0.07
1.70 +0.10/–0.15
0.25 +0.05/–0.07
0.90 +0.10/–0.15
0.85 +0.05/–0.07
Exposed Pad
0.90 ± 0.10
-B-
-A-
B
0.30 ± 0.10
0.10 M C A B
0.05 M C
Detail C
8 Places
Detail B Detail A
C
L
All measurements are in millimeters.
Dimensioning and tolerancing according to ASME Y14.5M-1994.
Coplanarity applies to the exposed heat sink slug as well as the terminals..
Plating requirement per source control drawing (SCD) 2504.
Dimension applies to metalized terminal and is measured between 0.15 mm and 0.30 mm from terminal tip. S1415
Figure 15. SKY65084-360LF 8-Pin QFN Package Dimensions
Notes:
1. Carrier tape: black conductive polystyrene.
2. Cover tape material: transparent conductive HSA.
3. Cover tape size: 5.40 mm width.
4. All measurements are in millimeters.
2.60 ± 0.10 (Ao)
2.60 ± 0.10 (Bo)
8.00 +0.30/–0.10
4.00 ± 0.104.00 ± 0.10
3.50 ± 0.05
2.00 ± 0.05 1.75 ± 0.10
0.30 ± 0.01 (T)
A
B
1.20 ± 0.10 (Ko)
A
B
B
A
Pin #1
∅1.50+ P0.10/–0.00
∅1.00 Min.
S1480
R0.30 Max
R0.30 Max
Figure 16. SKY65084-360LF Tape and Reel Dimensions
DATA SHEET • SKY65084-360LF LOW NOISE AMPLIFIER
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Ordering Information
Model Name Manufacturing Part Number Evaluation Board Part Numbers
SKY65084-360LF Low Noise Amplifier SKY65084-360LF (Pb-free package) SKY65084-360LF EVB
Copyright © 2009 Skyworks Solutions, Inc. All Rights Reserved.
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information contained herein. Skyworks may change its documentation, products, services, specifications or product descriptions at any time, without notice. Skyworks makes no commitment to
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Customers are responsible for their products and applications using Skyworks products, which may deviate from published specifications as a result of design defects, errors, or operation of
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