NJG1104KB2
800MHz BAND LNA GaAs MMIC
nGENERAL
DESCRIPTION
NJG1104KB2 is a variable gain low noise amplifier (LNA).
At 800MHz band, noise figure is 1.2dB, variable gain range
is 21dB and input 3rd order intercept point is +6dBm. These
characteristics are very suitable for CDMA cellular phone
application.
The variable attenuators placed in front of LNA realize wide
range of input power with low distortion.
Very small and thin FLP6-B2 package is adopted.
nFEATURES
lLow
voltage operation
lLow
current consumption
lHigh
gain
lLow
noise figure
lVariable
gain control
lHigh
input IP3
lHigh
output IP3
lUltra
small & ultra thin package
nPIN
CONFIGURATION
KB2 Type
(Top View)
4
3
nPACKAGE
OUTLINE
NJG1104KB2
+2.8V typ.
6.0mA typ.
15dB typ. @f=865MHz
1.2dB typ. @f=865MHz
21dB typ. @f=865MHz,V
CONT
=0.2 to 1.7V
+6dBm typ. @f=865.0+865.1MHz, P
in
=-30dBm
+21dBm typ. @f=865.0+865.1MHz, P
in
=-30dBm
FLP6-B2 (Mount Size: 2.1x2.0x0.75mm)
Pin Connection
1.SOURCE
2.GND
3.RFout
4.GND
5.VCONT
6.RFin
AMP
5
ATT
2
6
1
Note: The
portion above shows orientation mark printed on the package surface.
-1-
NJG1104KB2
nTERMINAL
INFORMATION
Pin
1
2, 4
3
5
6
Description
This terminal is internally connected to FET’s source of LNA. Please connect self-
SOURCE bias resistor (R1) and bypass capacitor (C3) through source inductor (L5). NF and
IIP3 are tunable by C3 and L5.
GND
RFout
Ground (0V) terminal. Ground plane should be placed as close to the ground
terminals. .
RF output and drain voltage supplies terminal. External matching circuit is
required.
Function
VCONT Gain control voltage (V
CONT
) supplies terminal.
RFin
RF input terminal. External matching circuit and DC blocking capacitor are required.
-3-
NJG1104KB2
nTYPICAL
CHARACTERISTICS
NF,Gain vs. VCONT
(V =2.8V, f=865MHz)
DD
OIP3,IIP3 vs. VCONT
(V =2.8V,I
20
Gain
25
DD
DD
=6mA,f=865+865.1MHz,Pin=-30dBm)
20
30
25
15
OIP3
20
Gain (dB)
OIP3 (dBm)
15
IIP3 (dBm)
15
10
IIP3
10
0.0
5
2.0
0.5
1.0
VCONT (V)
1.5
20
NF (dB)
10
15
5
10
0
5
NF
0
0.0
0.5
1.0
VCONT (V)
1.5
-5
-10
2.0
NF,Gain vs. IDD
(V =2.8V,V
2.0
DD
CONT
OIP3,IIP3 vs. IDD
(V =2.8V,V
16
25
DD
CONT
=1.7V,f=865MHz)
=1.7V,f=865+865.1MHz,Pin=-30dBm)
15
OIP3
1.5
Gain
15
20
OIP3 (dBm)
Gain (dB)
10
IIP3 (dBm)
5
0
4
5
6
7
IDD (mA)
8
9
10
NF (dB)
1.0
NF
14
IIP3
15
0.5
13
0.0
4
5
6
7
IDD (mA)
8
9
10
12
10
Rbias vs. IDD
(V =2.8V, V
DD
CONT
=1.7V)
200
180
160
Rbias (ohm)
140
120
Equations of OIP3 and IIP3
OIP3 =
3 × Pout - IM3
2
IIP3 = OIP3 - Gain
VCONT=1.7V@ Pin=-30dBm
100
80
60
3
4
5
6
7
IDD (mA)
8
9
10
11
VCONT=0.2V@ Pin=-10dBm
-5-
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