NJM2275
Under Development
RF AMPLIFIER FOR VHF/UHF(LOW) BAND
GENERAL DESCRIPTION
The
NJM2275
is a low current, low voltage RF amplifier,
especially designed for VHF/UHF(low) band.
The center frequency of this narrow band amplifier is
changed by external components.
PACKAGE OUTLINE
NJM2275F
FEATURES
Wide Operating Voltage
Low Operating Current
High Gain
Power Gain
Voltage Gain
Operating Frequency band
High Isolation
Bipolar Technology
Package Outline
1.8V to 6V
0.8mA type. at V
+
=1.9V, 400MHz input
15dB (1.9V, 400MHz input)
30dB (1.9V, 400MHz input, 1kΩ load)
VHF to UHF(Low)
26dB(OUT to IN, 400MHz)
MTP6
PIN CONFIGULATION
Orientation Mark
1
2
3
Top View
6
5
4
Pin Function
1. RF IN
2. GND
3. BIAS CAP
4. RF OUT
5. IREF
6. V+
BLOCK DIAGRAM
RF IN
1
GND
2
BIAS CAP
3
V+
6
I REF
5
RF OUT
4
Ver.2004-08-25
-1-
NJM2275
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Supply Voltage
Power Dissipation
Operating Temperature
Storage Temperature
SYMBOL
V
+
Pd
Topr
Tstg
RATINGS
10.0
200
- 40 to +85
- 40 to +125
(Ta=25°C)
UNIT
V
mW
°C
°C
(Ta=25°C)
MIN.
1.8
TYP.
1.9
MAX.
6.0
UNIT
V
RECOMMENDED OPERATING CONDITION
PARAMETER
Supply Voltage
SYMBOL
V
+
TEST CONDITIONS
ELECTRICAL CHARACTERISTICS
(
Ta=25°C, V
+
=1.9V, fin=400MHz, unless otherwise noted)
PARAMETER
Current Consumption
Power Gain
Voltage Gain
Noise Figure
Input Return Loss
Output Return Loss
RF OUT - RF IN Isolation
Power Input at 1dB compression Point
SYMBOL
Icc
PG
VG
NF
l S 11l
2
l S 22l
2
I SL
P–1dB
TEST CONDITIONS
No signal
Pin= - 40dBm
Test circuit1
Pin= - 40dBm
Test circuit2
Test Circuit1
Pin= - 40dBm
Test Circuit1
Pin= - 40dBm
Test Circuit1
Pin= - 40dBm
Test Circuit1
Test Circuit1
MIN.
-
-
-
-
-
-
-
-
TYP.
0.8
15
30
2.2
-7
-7
26
- 28
MAX.
1.0
-
-
-
-
-
-
-
UNIT
mA
dB
dB
dB
dB
dB
dB
dBm
-2-
Ver.2004-08-25
NJM2275
TEST CIRCUIT
This test circuit allows the measurement of all parameters described in “ELECTRICAL CHARACTERISTICS”.
Test Circuit 1
: PG , lS11l
2
, lS22l
2
, P–1dB , Output Level versus Input Level
L in
27n
C in
1000p
1
SG
(50Ω)
Cb
1000p
3
4
Lout Cout
15n 8p
6
V+
Cv
1000p
2
5
CL
2p
Spectrum
Analyzer
(Zin=50Ω)
Test Circuit 2
: VG , Output Level versus Input Level
L in
27n
C in
1000p
1
SG
(50Ω)
Cb
1000p
3
4
Lout Cout
27n 4p
6
V+
Cv
1000p
2
5
CL
2p
RL
1kΩ
Spectrum
Analyzer
(Zin=50Ω)
Test Circuit 3 :
Power Gain versus Input signal Frequency
L in
27n
C in
1000p
1
6
V+
Cv
1000p
2
Cb
1000p
3
5
CL
2p
4
Lout Cout
15n 8p
NF
meter
PG and PG shown in “Output level versus Input Level” are given by ,
PG = Pout – Pin
VG = (Pout + Prl ) – Pin
Prl is 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.2004-08-25
-3-
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
C in
L in
1000p 27n
RFIN
1
6
V+
Cv
1000p
2
Cb
1000p
3
5
CL
2p
4
Lout Cout
27n 4p
RL
1kΩ
RFOUT
Evaluation PC Board
V
+
Lout
CV
1608 1608
Cout
RFIN
1608
1608
①
1608
CL
1608
1608
RFOUT
RL
Cb
Cin Lin
Pin1
1608
This evaluation board is designed to have the maximum value of VG at 400MHz.
By using the value of Test Circuit1, this board can be changed to have the maximum value of PG at 400MHz.
If NF is not so good, Pin 5 may have a noisy signal. In such cases, it may be effective to connect a capacitor
between Pin 5 and ground. However, if the ground has a large noisy signal, NF may become worse.
-4-
Ver.2004-08-25
NJM2275
TYPICAL CHARACTERISTICS
(
Ta=25°C, V
+
=2.0V, unless otherwise noted
)
Power Gain/NF versus Input Signal Frequency
16
14
Test Circuit3
PG
8
7
6
5
4
NF
3
2
1
0
300
350
400
450
Input Signal Frequency fin(MHz)
500
Power Gain PG(dB)
12
10
8
6
4
2
0
Pout/Icc versus Pin
10
0
Pout
-10
-20
-30
-40
Icc
-50
-60
-60
-50
-40
-30
-20
-10
0
Power Input Level Pin(dBm)
10
20
1
0
5
4
3
2
Test Circuit1(Power Gain)
7
6
Current Consumption Icc(mA)
10
0
-10
-20
-30
-40
-50
-60
-60
-50
NF(dB)
Pout / Icc versus Pin
Test Circuit2(Voltage Gain)
7
6
5
Pout
4
3
2
Icc
1
0
-40
-30
-20
-10
0
Power Input Level Pin(dBm)
10
20
Current Consumption Icc(mA)
Power Output Level Pout(dBm)
Power Output Level Pout(dBm)
[CAUTION]
The specifications on this databook are only
given for information , without any guarantee
as regards either mistakes or omissions. The
application circuits in this databook are
described only to show representative usages
of the product and not intended for the
guarantee or permission of any right including
the industrial rights.
Ver.2004-08-25
-5-
TI技术论坛
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
