DATA SHEET
CX65105: 1700 – 2200 MHz Linear Power Amplifier
Applications
•
PCS/DCS/UMTS
•
Repeaters
•
WLL and ISM bands
•
Mobile radio
•
Telematics
Description
Skyworks CX65105 Power Amplifier (PA) is a fully matched, 8-pin
Leadless Chip Carrier (LCC) surface mount module, developed for
Personal Communications System (PCS), Digital Communications
System (DCS), and Universal Mobile Telephone System (UMTS)
applications. Wireless Local Loop (WLL) and Industrial, Scientific,
Medical (ISM) applications are also supported.
This small, power-efficient PA has a full 1700 to 2200 MHz
bandwidth coverage packed into a single compact package. All
active circuitry in the module is contained in a single Gallium
Arsenide (GaAs) Microwave Monolithic Integrated Circuit (MMIC).
The CX65105 is manufactured with Skyworks Aluminum (Al) GaAs
Heterojunction Bipolar Transistor (HBT) process, which allows for
single supply operation while maintaining high efficiency and
good linearity.
The 8-pin Leadless Chip Carrier (LCC) device package and pinout
are shown in Figure 1. Figure 2 shows a functional block diagram
for the CX65105. Signal pin assignments and functional pin
descriptions are provided in Table 1.
Features
•
Typical P
OUT
of 28.5 dBm
•
High linearity
•
Low power consumption
•
Single +5 V supply
•
LCC (8-pin, 8 x 8 mm) package
VREF
3
VCC1
8
VCC2
4
VCC1
8
GND
RFIN
VREF
1
2
3
4
7
6
5
GND
RFOUT
RFIN
2
Driver Stage
Bias
Power Stage
Bias
Input Match
PA
Interstage Match
PA
Output Match
6
RFOUT
GND
MMIC
Module
GND
1, 5, 7
C1220
VCC2
S384
Figure 1. CX65101 Pinout– 8-Pin LCC
Package (Top View)
Figure 2. CX65105 Functional Block Diagram
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
101476F • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • October 15, 2004
1
DATA SHEET • CX65105
Table 1. CX65105 Signal Descriptions
Pin #
1
2
3
4
GND
RFIN
VREF
VCC2
Name
Ground
RF input
Reference voltage
Supply voltage
Description
Pin #
5
6
7
8
GND
RFOUT
GND
VCC1
Name
Ground
Rf output
Ground
Supply voltage
Description
Technical Description
The CX65105 is comprised of two amplifier stages. The matching
circuits for the input stage, inter-stage, and output stage are
contained within the device. The bias circuits for both input and
output stages are included within the device for optimum
temperature tracking performance.
The CX65105 is internally matched for optimum linearity and
efficiency. The input and output stages are independently
supplied using the VCC1 and VCC2 supply lines, pins 8 and 4
respectively. The bias reference voltage is supplied using a
common VREF (pin 3) line.
ensure that the part is not subjected to a temperature that
exceeds 300
°C
for more than 10 seconds.
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.
Electrical and Mechanical Specifications
The absolute maximum ratings of the CX65105 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 over temperature of the
CX65105 are illustrated in Figures 3 through 8.
Figure 13 shows the package dimensions for the 8-pin CX65105
LCC and Figure 14 provides the tape and reel dimensions.
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.
If the part is attached in a reflow oven, the temperature ramp rate
should not exceed 5
°C
per second. Maximum temperature
should not exceed 225
°C
and the time spent at a temperature
that exceeds 210
°C
should be limited to less than 10 seconds. If
the part is manually attached, precaution should be taken to
Electrostatic Discharge (ESD) Sensitivity
The CX65105 is a static-sensitive electronic device. Do not
operate or store near strong electrostatic fields. Take proper ESD
precautions.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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October 15, 2004 • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • 101476F
DATA SHEET • CX65105
Table 2. CX65105 Absolute Maximum Ratings
Parameter
RF input power
Supply voltage
Reference voltage
Case operating temperature
Storage temperature
Note:
Symbol
P
IN
V
CC
V
REF
T
C
T
ST
Min
Typical
Max
7
6
4
Units
dBm
V
V
°C
°C
–40
–55
+85
+125
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.
Table 3. CX65105 Recommended Operating Conditions
Parameter
Supply voltage
Reference voltage
Operating frequency
VCC
V
REF
F
O
1700
Symbol
Min
Typical
5
3.6
1900
2200
Max
Units
V
V
MHz
Table 4. CX65105 Electrical Characteristics
(VCC = 5.0 V, V
REF
= 3.6 V, Frequency = 1900 MHz, T
C
= 25 °C, unless otherwise noted)
Parameter
Analog Inputs
Frequency range
Quiescent current
Small signal gain
Output power
Efficiency
Noise Figure (NF)
Output IP3
I
Q
G
P
OUT
PAE
NF
OIP3
Two tones with 100 kHz
spacing, P
IN
= 0 dBm per
tone
f = 1960 MHz
f = 2140 MHz
36
P
IN
= –15 dBm
P
IN
= 5 dBm
P
IN
= 5 dBm
23.5
27
25
1700
1900
143
25.0
28.5
30
6
40
7
2200
185
MHz
mA
dB
dBm
%
dB
dBm
Symbol
Test Conditions
Min
Typical
Max
Units
P
OUT
@ ACPR = –45 dBc
P
OU
t @ ACLR = –45 dBc
Note:
P
OUT
_
ACPR
P
OUT
_
ACLR
22
18
24
20
dBm
dBm
The above specifications apply only to the 1900 MHz operating frequency.
31
30
29
36
34
32
30
Pout (dBm)
PAE (%)
28
27
26
25
24
2
3
4
5
6
7
-30C
25C
85C
28
26
24
22
20
18
16
2
3
4
5
6
7
85C
25C
-30C
Pin (dBm)
Pin (dBm)
Figure 3. Typical P
OUT
vs P
IN
Over Temperature
Figure 4. Typical PAE vs P
IN
Over Temperature
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
101476F • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • October 15, 2004
3
DATA SHEET • CX65105
30
8
7
6
Small Signal Gain (dB)
25
20
85C
NF (dB)
5
85C
15
10
5
0
1700
1800
1900
2000
2100
2200
25C
-30C
4
3
2
1
0
1700
1800
1900
2000
2100
2200
25C
-30C
Freq (MHz)
Freq (MHz)
Figure 5. Typical Small Signal Gain vs Frequency Over
Temperature
Figure 6. Typical Noise Figure vs Frequency Over Temperature
50
35
30
40
25
OIP3 (dBm)
30
Pout (dBm)
85C
25C
20
15
10
-30C
25C
85C
20
-30C
10
5
0
1700
1800
1900
2000
2100
2200
0
1700
1800
1900
2000
2100
2200
Freq (MHz)
Freq (MHz)
Figure 7. Typical OIP3 vs Frequency Over Temperature
Figure 8. Typical P
OUT
vs Frequency Over Temperature
Evaluation Board Description
Skyworks CX65105 Evaluation Board is used to test the
performance of the CX65105 PA. The Evaluation Board schematic
diagram is shown in Figure 9. The schematic shows the basic
design of the board for the 1700 to 2200 MHz range. Figure 10
provides the Evaluation Board assembly diagram. Figure 11
provides the Evaluation Board layer detail.
Circuit Design Considerations
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 CX65105 PA 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.
3. Two external output bypass capacitors (0.01
µF
and 4.7
µF)
are required on the VCC1 (pin 8) supply input. The same two
capacitors are also required on the VCC2 (pin 4) supply input.
Both capacitors should be placed in parallel between the
supply line and ground. Also, a bypass capacitor of 0.01
µF
is
required on the VREF input (pin 3). See Figure 9 for a detailed
diagram.
4. VCC1 (pin 8) and VCC2 (pin 4) may be connected together at
the supply.
5. At the RF input (pin 2), a DC blocking capacitor is required.
6. The RF output includes an onboard internal DC blocking
capacitor. All impedance matching is provided internally.
Therefore, the application only needs to provide a good 50
Ω
load.
Testing Procedure
Use the following procedure to set up the CX65105 Evaluation
Board for testing. Refer to Figure 12 for guidance:
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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October 15, 2004 • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • 101476F
DATA SHEET • CX65105
1. Connect a +5.0 V supply voltage to VCC1 and VCC2, and
+3.6 V supply voltage to VREF. If available, enable the current
limiting function of the power supplies to 1.0 A for the +5.0 V
supply current and 30 mA for the +3.6 V supply current.
2. Connect a signal generator to the RF signal input port. Set it to
the desired RF frequency at a power level of 7 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 the input signal exceeds the rated power, the
CX65105 Evaluation Board can be permanently
damaged.
+5 V
C1
0.01
µF
VCC1
8
1
C2
4.7
µF
T1
RF in
C5
4.7 pF
T2
50
Ω
microstrip
7
T3
50
Ω
microstrip
RF out
RFIN
VREF
2
3
4
6
5
RFOUT
C6
0.01
µF
VCC2
C3
0.01
µF
Pin 9
Package Base
+3.6 V
Notes:
1) Pin 9 provides both a thermal and electrical ground.
This ground path is critical and must be as short
as possible.
2) Transmission line lengths T1 and T2 should be
minimized.
C4
4.7
µF
+5.0 V
C1237d
Figure 9. Evaluation Board Schematic, 1700 MHz to 2200 MHz
C1
8x8 PA EVALUATION BD.
C2
C5
C6
J1 (RF In)
C3
J2 (RF Out)
C4
VCC1
VCC2
VREF
GND
GND
GND
J3
C1257b
Figure 10. Evaluation Board Assembly Diagram
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
101476F • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • October 15, 2004
5
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