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高线性度的低噪放.pdf
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RF2442
• TDMA/CDMA/FM Cellular Rx LNA
TDMA/CDMA PCS Rx LNA
Low Noise Transmit Driver Amplifier
ISM Band LNA/Driver
General Purpose Amplification
Commercial and Consumer Systems
The RF2442 is a low noise amplifier with a very high
dynamic range designed for the receive front end of digi-
tal cellular applications at 900MHz, 1900MHz, and
2400MHz. It is designed to amplify low level signals with
minimum noise contribution while operating in the harsh,
interference-rich environments of newly deployed digital
subscriber units. The device also functions as an out-
standing PA driver amplifier in the transmit chain of digital
subscriber units where low transmit noise power is a con-
cern. The device supports trade-offs between linearity
and current drain. The designer has control of these
trade-offs with the choice of an external bias resistor. The
IC is featured in a standard miniature 8-lead plastic
MSOP package.
GaAs MESFET
Si CMOS
Si BJT
Si Bi-CMOS
GaAs HBT
SiGe HBT
VC C 1
1
G N D 1
2
R F IN
3
G N D 2
4
8
VC C 2
7
N C
6
R F O U T
5
N C
.196
.190
1
.120
.116
.120
.116
10°MAX
0°MIN
.016
.010
.026
.006
.002
.036
.032
.027
.017
.009
.005
Low Noise and High Intercept Point
External Bias Control
Single 2.5V to 5.0V Power Supply
500MHz to 2500MHz Operation
Extremely Small MSOP-8 Package
High-Linearity Low Noise Amplifier
RF2442
RF2442 PCBA-L Fully Assembled Evaluation Board (~900MHz)
RF2442 PCBA-M Fully Assembled Evaluation Board (~1900MHz)
RF2442 PCBA-H Fully Assembled Evaluation Board (~2400MHz)
RF Micro Devices, Inc.
7625 Thorndike Road
Greensboro, NC 27409, USA
Tel (336) 664 1233
Fax (336) 664 0454
http://www.rfmd.com
Rev B5 991207
4-231
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RF2442
Absolute Maximum Ratings
Parameter
Supply Voltage
Input RF Level
Operating Ambient Temperature
Storage Temperature
Rating
-0.5 to +6.0
+10
-40 to +85
-40 to +150
Unit
VDC
dBm
°C
°C
Parameter
Overall
RF Frequency Range
881MHz Performance
Gain
Output P1dB
Output IP3
Noise Figure
Reverse Isolation
1960MHz Performance
Gain
Output P1dB
Output IP3
Noise Figure
Reverse Isolation
Specification
Min.
Typ.
Max.
500 to 2500
20
19
18
+13
+11
+27
+22
+16
1.6
1.5
1.4
24
24
23
12
12
12
+16
+13
+26
+21
+15
1.6
1.5
1.4
20
19
19
Caution! ESD sensitive device.
RF Micro Devices believes the furnished information is correct and accurate
at the time of this printing. However, RF Micro Devices reserves the right to
make changes to its products without notice. RF Micro Devices does not
assume responsibility for the use of the described product(s).
Unit
Condition
MHz
dB
dB
dB
dBm
dBm
dBm
dBm
dBm
dB
dB
dB
dB
dB
dB
dB
dB
dB
dBm
dBm
dBm
dBm
dBm
dB
dB
dB
dB
dB
dB
Requires input tuning inductor below 1GHz
Schematic Evaluation Board L (RC=0),
T = 25°C, RF=881MHz
VCC=3.6V
VCC=3.0V
VCC=2.5V
VCC=3.6V
VCC=3.0V
VCC=3.6V
VCC=3.0V
VCC=2.5V
VCC=3.6V
VCC=3.0V
VCC=2.5V
VCC=3.6V
VCC=3.0V
VCC=2.5V
Schematic Evaluation Board M (RC=0),
T = 25°C, RF=1960MHz
VCC=3.6V
VCC=3.0V
VCC=2.5V
VCC=3.6V
VCC=3.0V
VCC=3.6V
VCC=3.0V
VCC=2.5V
VCC=3.6V
VCC=3.0V
VCC=2.5V
VCC=3.6V
VCC=3.0V
VCC=2.5V
4-232
Rev B5 991207
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Parameter
2400MHz Performance
Gain
Output IP3
Noise Figure
Reverse Isolation
Power Supply
Voltage
Current Consumption
RF2442
Specification
Min.
Typ.
Max.
Unit
Condition
9
9
8
+26
+21
+15
1.6
1.5
1.4
17
17
17
2.5 to 5.0
19
12
9
Schematic Evaluation Board H (RC=0),
T = 25°C, RF=2400MHz
VCC=3.6V
VCC=3.0V
VCC=2.5V
VCC=3.6V
VCC=3.0V
VCC=2.5V
VCC=3.6V
VCC=3.0V
VCC=2.5V
VCC=3.6V
VCC=3.0V
VCC=2.5V
T = 25°C
VCC=3.6V
VCC=3.0V
VCC=2.5V
dB
dB
dB
dBm
dBm
dBm
dB
dB
dB
dB
dB
dB
V
mA
mA
mA
Rev B5 991207
4-233
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RF2442
Pin
1
Function
VCC1
2
3
4
5
6
7
8
GND1
RF IN
GND2
NC
RF OUT
NC
VCC2
Description
Supply voltage for the LNA. External RF and IF bypassing is required.
The trace length between the pin and the bypass capacitors should be
minimized. The ground side of the bypass capacitors should connect
immediately to ground plane. This pin connects to pin 8 through a
150Ω resistor. This allows for simple biasing of the collector at pin 6.
Refer to Application Schematics 1 and 3.
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane for best performance.
RF input pin. This pin is internally DC blocked and matched to 50Ω for
frequencies above 1GHz. When using below 1GHz, it is recommended
that this pin be matched with series inductance to series-resonate out
the internal blocking capacitor. Refer to Application Schematics 1 and
2.
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane for best performance.
No connection. This pin is typically left unconnected or grounded.
LNA Output pin. This pin is an open-collector output. It must be biased
to either VCC or pin 8 through a choke or matching inductor. This pin is
typically matched to 50Ω with a shunt bias/matching inductor and
series blocking/matching capacitor. Refer to application schematics.
No connection. This pin is typically left unconnected or grounded.
Optional power supply connection for biasing pin 6. This pin connects
to pin 1 through a 150Ω resistor. This allows for simple biasing of the
collector at pin 6. When used, this pin should be RF bypassed. Refer to
Application Schematics 1 and 3.
Interface Schematic
VCC1
150 Ω
BIAS
VCC2
To bias
circuits
LNA
OUT
LNA
IN
See pin 3.
See pin 1.
4-234
Rev B5 991207
4
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RF2442
(Download Bill of Materials from www.rfmd.com.)
C 1
1 nF
C 2
22 pF
L2
8.2 nH
C 5
1.5 pF
1
2
3
4
50 Ω µstrip
J1
R F IN
2442401-
R 1
0 Ω
C 3
22 pF
C 4
1.5 pF
L1
15 nH
8
7
6
5
V C C
50 Ω µstrip
J2
R F O U T
C 1
1 nF
C 2
22 pF
1
2
3
4
50 Ω µstrip
J1
R F IN
2442400B
R 1
0 Ω
C 3
22 pF
C 4
1.0 pF
L1
4.7 nH
8
7
6
5
V C C
50 Ω µstrip
J2
R F O U T
C 1
1 nF
C 2
22 pF
1
2
3
4
50 Ω µstrip
J1
R F IN
2442402-
R 1
0 Ω
C 3
22 pF
C 4
0.5 pF
L1
3.9 nH
8
7
6
5
V C C
50 Ω µstrip
J2
R F O U T
Rev B5 991207
4-235
RF2442
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4-236
Rev B5 991207
RF2442
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Rev B5 991207
4-237
RF2442
Gain vs. Output Level
(Freq = 881MHz)
Vcc=3.0, Noise Match
Vcc=3.0, Gmax Match
Vcc=3.6, Noise Match
Vcc=3.6, Gmax Match
-5
0
5
10
15
Output Level (dBm)
Input IP3 vs. Input Level
(Freq = 881MHz)
Vcc=3.0, Noise Match
Vcc=3.0, Gmax Match
Vcc=3.6, Noise Match
Vcc=3.6, Gmax Match
-25
-20
-15
Input Level (dBm)
-10
-5
Output IM3 Level vs. Input Level
(Freq = 881MHz)
Vcc=3.0, Noise Match
Vcc=3.6, Noise Match
Ideal IM3 Slope
30
25
20
15
10
-10
10
5
0
-5
-10
-30
10
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
)
B
d
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m
B
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(
3
P
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u
p
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I
)
m
B
d
(
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o
t
r
e
p
,
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e
v
e
L
3
M
I
t
u
p
u
O
t
-30
-25
-20
-15
-10
-5
Input Level, per tone (dBm)
4-238
)
B
d
(
e
r
u
g
F
e
s
o
N
i
i
)
m
B
d
(
3
P
I
t
t
u
p
u
O
)
l
m
B
d
(
e
n
o
t
e
g
n
s
,
l
e
v
e
L
t
u
p
t
u
O
i
2.5
2.0
1.5
1.0
0.5
0.0
800
30
25
20
15
10
-10
20
15
10
5
0
-5
-10
-30
Noise Figure vs. Frequency
Vcc=3.0, Noise Match
Vcc=3.0, Gmax Match
Vcc=3.6, Noise Match
Vcc=3.6, Gmax Match
850
900
950
1000
Frequency (MHz)
Output IP3 vs. Output Level
(Freq = 881MHz)
Vcc=3.0, Noise Match
Vcc=3.0, Gmax Match
Vcc=3.6, Noise Match
Vcc=3.6, Gmax Match
-5
0
5
10
15
Output Level (dBm)
Power Out vs. Power In
(Freq = 881MHz)
Vcc = 3.0V
Vcc = 3.6V
Ideal Gain Slope (3.6V)
-25
-20
-15
-10
-5
Input Level, single tone (dBm)
Rev B5 991207
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