NJM2275
VHF/UHF BAND RF AMPLIFIER
GENERAL DESCRIPTION
The
NJM2275
is a low current, low voltage RF amplifier,
especially designed for VHF/UHF band.
The center frequency of this narrow band amplifier is
changed by external components.
PACKAGE OUTLINE
NJM2275F1
FEATURES
Wide Operating Voltage
Low Operating Current
High Gain
Power Gain
Voltage Gain
Operating Frequency band
High Isolation (OUT to IN)
Bipolar Technology
Package Outline
1.8V to 6V
0.8mA type. @ V
+
=1.9V, no signal input
15dB @1.9V, 400MHz input
30dB @1.9V, 400MHz input, 1kΩ load
Up to 800MHz
45dB @1.9V, 400MHz
SOT23-6 (MTP6)
PIN CONFIGULATION
Orientation Mark
1
2
3
Top View
Simplified Block Diagram
6
5
4
Pin Function
1. RF IN
2. GND
3. BIAS CAP
4. RF OUT
5. IREF
6. V+
RF IN
1
GND
2
BIAS CAP
3
V+
6
I REF
5
RF OUT
4
RF IN
1
GND
2
BIAS CAP
3
V+
6
I REF
5
RF OUT
4
Ver.2005-06-01
-1-
NJM2275
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Supply Voltage
Power Dissipation
RF Input Level
Operating Temperature
Storage Temperature
SYMBOL
V
+
P
D
Pinmax
Topr
Tstg
RATINGS
10.0
200
6
- 40 to + 85
- 40 to +125
(Ta=25°C)
UNIT
V
mW
dBm
°C
°C
(Ta=25°C)
MIN.
1.8
TYP.
1.9
MAX.
6.0
UNIT
V
RECOMMENDED OPERATING CONDITIONS
PARAMETER
Supply Voltage
SYMBOL
V
+
TEST CONDITIONS
ELECTRICAL CHARACTERISTICS
PARAMETER
Operating Current
Power Gain
Voltage Gain
Noise Figure
Input Return Loss
Output Return Loss
RF OUT - RF IN Isolation
Power Input at 1dB compression Point
(Ta=25°C, V
+
=1.9V, fin=400MHz, unless otherwise noted)
SYMBOL
Icc
PG
VG
NF
l S 11l
l S 22l
I SL
P
–1dB
TEST CONDITIONS
No signal
Pin= - 40dBm
Test circuit 1
Pin= - 40dBm
Test circuit 2
Test Circuit 3
Pin= - 40dBm
Test Circuit 4
Pin= - 40dBm
Test Circuit 4
Pin= - 40dBm
Test Circuit1
Test Circuit1
MIN.
-
-
-
-
-
-
-
-
TYP.
0.8
15
30
2.2
-8
- 20
45
- 28
MAX.
1.0
-
-
-
-
-
-
-
UNIT
mA
dB
dB
dB
dB
dB
dB
dBm
Ver.2005-06-01
-2-
NJM2275
TEST CIRCUIT
These test circuits allow the measurement of all parameters described in “ELECTRICAL CHARACTERISTICS”.
Test Circuit 1 for Icc, PG , P
–1dB
and Pin vs. Pout
L in
27n
C in
1000p
RF IN
1
V+
6
I REF
5
RF OUT
4
Cref
1000p
V+
Cv
1000p
SG
(50Ω)
GND
2
Cb
BIAS CAP
1000p
3
CL
2p
Lout Cout
15n
8p
RL
0Ω
Spectrum
Analyzer
(Zin=50Ω)
Test Circuit 2 for VG
L in
27n
C in
1000p
RF IN
1
V+
6
I REF
5
RF OUT
4
Lout
27n
Cref
1000p
V+
Cv
1000p
SG
(50Ω)
GND
2
Cb
BIAS CAP
1000p
3
CL RL
1000p 1kΩ
Cout
4p
Spectrum
Analyzer
(Zin=50Ω)
PG and VG has the following relation.
PG = Pout – Pin
VG = (Pout + Prl ) – Pin
where
Pin = input level in dBm
Pout = output level in dBm
Prl = the loss caused by the voltage drop of RL.
RL is 1000
Ω.
The input impedance of spectrum analyzer Zin is 50Ω. Prl is calculated from
Prl = 20log ( ( RL + Zin) / RL)
Prl = 20 log (1050 / 50 )
Ver.2005-06-01
-3-
NJM2275
Test Circuit 3
for
NF
L in
27n
C in
1000p
RF IN
1
GND
2
V+
6
I REF
5
RF OUT
4
Cref
1000p
V+
Cv
1000p
Cb
BIAS CAP
1000p
3
CL
2p
Lout Cout
15n
8p
NF
m eter
Test Circuit 4 for lS11l and lS22l
L in
27n
C in
1000p
RF IN
1
GND
2
V+
6
I REF
5
RF OUT
4
Cref
1000p
V+
Cv
1000p
Cb1
1000p
BIAS CAP
3
CL
2p
Lout Cout
15n
8p
Netw ork
Analyzer
Test Circuit 5 for S-Parameters
(this item is not specified in “ELECTRICAL CHARACTERISTICS”)
RF IN
1
GND
2
Cb1
1000p
Cb2
0.1u
BIAS CAP
3
V+
6
I REF
5
RF OUT
4
Cv1
1000p
Cref1
1000p
V+
Cv2
0.1u
Cref2
0.1u
Netw ork Analyzer
Port1
Port2
HP8753D
Ver.2005-06-01
-4-
NJM2275
EVALUATION PC BOARD
The evaluation board is useful for your design and to have more understanding of the usage and performance of
this device. This circuit is the same as TEST CIRCUIT. Note that this board is not prepared to show the
recommendation of pattern and parts layout.
Circuit Diagram
V+
C in
1000p
RF IN
L in
27n
RF IN
1
GND
2
Cb
BIAS CAP
1000p
3
V+
6
I REF
5
RF OUT
4
Lout Cout
15n
8p
Cref
1000p
Cv
1000p
CL
2p
RL
0Ω
RF OUT
Evaluation PC Board
V
+
Lout
Cv
1608
Cout
1608
Cin
RFIN
1608
1608
Cl
1608
Rl
1608
RFOUT
Lin
1608
①
Cref
1608
1608
Cb
Pin1
This evaluation board is designed to have the maximum value of PG at 400MHz.
By using the value of Test Circuit2, this board can have the maximum value of VG at 400MHz.
Cref is effective to obtain good NF. However, if the ground has a large noisy signal, NF may become worse.
Ver.2005-06-01
-5-
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