DATA SHEET
SKY65015-70LF: 0.1 to 6.0 GHz InGaP Cascadable Amplifier
Applications
Wireless infrastructure: WLAN, HLAN, DBS, broadband, cellular
base stations
Test instrumentation
Cable television
INPUT
(50
Ω)
200356-001
OUTPUT
(50
Ω)
Features
Broadband frequency range: 0.1 to 6.0 GHz
Small signal gain = 18 dB typical @ 2 GHz
High OIP3: +35 dBm typical
OP1dB = +17 dBm typical @ 2 GHz
Input and output impedance: 50
Ω
nominal
Single, positive DC supply voltage
SOT-89 (4-pin, 1.5 x 4.0 mm) package
(MSL1, 260
°C
per JEDEC J-STD-020)
Figure 1. SKY65015-70LF Functional Block Diagram
Description
Skyworks SKY65015-70LF is a general purpose, broadband
amplifier. The device is fabricated from Skyworks HBT process
and packaged in a miniature Small Outline Transistor (SOT-89)
package.
The device’s 50
Ω
input and output impedance allow it to be
easily cascaded without external impedance matching networks.
The typical –3 dB bandwidth of the SKY65015-70LF is 0.1 to
6.0 GHz.
A functional block diagram is provided in Figure 1. The device
package and pinout are shown in Figure 2.
Skyworks Green
TM
products are compliant with
all applicable legislation and are halogen-free.
For additional information, refer to
Skyworks
Definition of Green
TM
, document number
SQ04–0074.
GND
4
1
INPUT
2
GND
3
OUTPUT
200356-002
Figure 2. SKY65015-70LF Pinout
(Top View)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
200356I • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • March 30, 2017
1
DATA SHEET • SKY65015-70LF: CASCADABLE AMPLIFIER
Electrical and Mechanical Specifications
Signal pin assignments and functional pin descriptions are
described in Table 1. The absolute maximum ratings of the
SKY65015-70LF are provided in Table 2. Electrical specifications
are provided in Table 3.
Table 1. SKY65015-70LF Signal Descriptions
Pin
1
2
3
4
INPUT
GND
OUTPUT
GND
Name
Description
RF input with 50
Ω
nominal input impedance. An internally generated DC voltage is present at this pin, so an external DC block
should be used to connect this pin to the external circuit.
Ground
RF output. DC supply voltage input and RF output with 50
Ω
nominal output impedance. The nominal voltage required at this pin is
listed in Table 3. Supply current is determined by an external resistor connected between the DC power supply and this pin.
Ground
Typical performance characteristics of the SKY65015-70LF are
illustrated in Figures 3 through 6.
Table 2. SKY65015-70LF Absolute Maximum Ratings
1
Parameter
Supply voltage
RF input power
Supply current
Power dissipation @ T
C
= 25 °C
Operating case temperature
Storage temperature
Junction temperature
Thermal resistance
Electrostatic discharge:
Charged Device Model (CDM), Class III
Human Body Model (HBM), Class 1B
Machine Model (MM), Class A
1
Symbol
V
S
P
IN
I
S
P
D
T
C
T
ST
T
J
Θ
JC
ESD
Minimum
Maximum
5
+15
120
500
Units
V
dBm
mA
mW
°C
°C
°C
°C/W
V
V
V
–40
–65
+85
+125
+150
70
500
500
100
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.
ESD HANDLING:
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 when handling or transporting. Static charges may easily produce
potentials of several kilovolts on the human body or equipment, which can discharge without detection.
Industry-standard ESD handling precautions should be used at all times.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
2
March 30, 2017 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200356I
DATA SHEET • SKY65015-70LF: CASCADABLE AMPLIFIER
Table 3. SKY65015-70LF Electrical Specifications
1
(I
S
= 70 mA, T
C
= 25 °C, P
IN
= –10 dBm, Characteristic Impedance [Z
O
] = 50
Ω,
Unless Otherwise Noted)
Parameter
Small signal gain
3 dB gain bandwidth
Noise Figure
1 dB Output Compression Point
Input and output VSWR
3rd Order Output Intercept Point
Symbol
|S
21
|
BW
3
DB
NF
OP1dB
VSWR
OIP3
@ 2 GHz
@ 2 GHz
0.1 to 4.0 GHz
@ 2 GHz,
P
IN
= 0 dBm/tone,
Δf
= 10 MHz
Measured @ pin 3
0.1 to 8.0 GHz
10 MHz to 6 GHz
4.5
+16
Test Conditions
@ 2 GHz
Min
17
Typ
18
6
4.2
+17
1.9:1
+35
2.0:1
Max
19
Units
dB
GHz
dB
dBm
–
dBm
Operating voltage
Reverse isolation
Gain flatness
V
D
|S
12
|
4.7
20
±1.5
5.0
V
dB
dB
1 Performance is guaranteed only under the conditions listed in this table.
Typical Performance Characteristics
(I
S
= 70 mA, Characteristic Impedance [Zo] = 50
Ω,
Unless Otherwise Noted)
25
–40 °C
20
–10
–15
+25 °C
Isolation (dB)
+85 °C
–20
–25
+85 °C
–30
–35
–40
0
1
2
Gain
(dB)
15
10
5
0
+25 °C –40 °C
200356-003
0
1
2
3
4
5
6
3
4
5
6
Frequency (GHz)
Figure 3. Small Signal Gain vs Frequency
0
–5
Frequency (GHz)
Figure 4. Isolation vs Frequency
0
–5
Return Loss (dB)
–10
–15
–20
–25
–30
0
1
2
–40 °C
Return Loss (dB)
–10
+25 °C
–15
+85 °C
–20
–25
–40 °C
200356-006
+25 °C
+85 °C
3
4
5
6
200356-005
0
1
2
3
4
5
6
Frequency (GHz)
Figure 5. Input Return Loss vs Frequency
Frequency (GHz)
Figure 6. Output Return Loss vs Frequency
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
200356I • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • March 30, 2017
3
200356-004
DATA SHEET • SKY65015-70LF: CASCADABLE AMPLIFIER
Theory of Operation
The SKY65015-70LF is a Darlington feedback amplifier that
features a constant gain-bandwidth product for use as an RF gain
block. It uses a circuit topology where two transistors are
combined to form a configuration known as a Darlington pair.
This transistor pair behaves like a single transistor with a current
gain equivalent to the product of the current gain of the two
transistors. Darlington transistors are connected in an emitter-
follower configuration, while sharing the same collector contact.
The current amplified by the first transistor is amplified further by
the second. This gives a high current gain (written
β
or h
FE
), and
takes less space than two discrete transistors in the same
configuration. As RF gain blocks, Darlington pairs are offered as
integrated packaged devices, usable DC to over 10 GHz. They
exhibit good broadband matching into 50 Ω and tight performance
distributions. The power supply for this amplifier should be a
fixed current, I
S
, rather than a fixed voltage. Due to the I-V
characteristics of the base-emitter junction of each HBT, a small
change in voltage or temperature can result in a large change in
current. Therefore, it is better to supply the Darlington pair with a
fixed current, rather than a fixed voltage to properly set the base
voltages and the collector currents of each transistor in the
Darlington pair. The values of resistors R2 and R3 are selected to
set the base voltages and currents of the Darlington pair, as well
as to establish the necessary feedback to set the input and output
impedances of the amplifier.
supply or by replacing L3 with reistor R1, the value of which is
given in shown in Table 5. The Evaluation Board is shipped with
L3 in place, which shifts an in-band series resonance of the
supply decoupling network out of band. For low frequency
applications, R1 may be used to conveniently limit supply current
on the Evaluation Board.
The Evaluation Board also contains a probe fixture that facilitates
the direct measurement of the S-parameters. The probe fixture
comprises a very short Co-Planar Waveguide (CPW) transmission
line to pin 1 and an identical line to pin 3. The other two pins of
the amplifier are grounded. The CPW transmission lines are
compatible with ground-signal-ground wafer probe tips, which
can be connected to the RF ports of a Vector Network Analyzer
(VNA) using coaxial cables. The very small electrical length of
these CPW transmission lines obviates the need to de-embed
their effects from the S-parameters that are measured. The
supply constant current must be applied using the bias tee, which
is typically integrated into the VNA, and cascaded with the
OUTPUT pin of the amplifier.
Application Board Test Procedure
Use the following procedure to set up the SKY65015-70LF
Evaluation Board for testing:
1. Option 1: Connect a 70 mA current supply to V
S
. (V
S
is labeled
“V
CC
” on the Evaluation Board)
Option 2: Connect a 5 V voltage supply to V
S
, use the
appropriate R1 value to set the supply current limit to 70 mA.
See Current Limiting Resistor Values tables for other values of
V
S
.
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.
Evaluation Board Description
The Skyworks SKY65015-70LF Evaluation Board is used to test
the performance of the SKY65015-70LF cascadable amplifier.
The Evaluation Board is shown in Figure 7. An Evaluation Board
schematic is shown in Figure 8. Table 4 provides the Bill of
Materials (BOM) for Evaluation Board components.
The input and output of the SKY65015-70LF are connected using
50
Ω
microstrip transmission lines with DC blocking capacitors,
C1 and C2, to the input and output SMA connectors, respectively.
The positive supply voltage, V
D
, is connected to pin 3 (OUTPUT) of
the amplifier using the decoupling network that consists of C4,
L1, L2, and R1. The power supply current, I
S
, must be limited
either by the current limit function of an external bench power
6.
Take measurements.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
4
March 30, 2017 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200356I
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