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NJM2278
300/400MHz Band 20mW Power Amplifier
!
GENERAL DESCRIPTION
The NJM2278 is a narrow band, small signal amplifier, especially designed for use as the final RF amplifier in 300MHz / 400MHz band transmitter. The amplifier produces an output power of up to 20mW at the desired frequency, which frequency and power are adjusted by external input and output matching circuits. It also features excellent thermal stability of power gain.
! PACKAGE OUTLINE
NJM2278F1 !
APPLICATIONS
300/400MHz Band Applications, 400MHz Industrial Radios, Digital Communication Systems
!
FEATURES (@400MHz, 2.7V)
# # # # # # # # # # # Low Operating Voltage 2V to 5.5V Low Operating Current 20 mA @ 0dBm input Power Gain 17dB @ - 30dBm input 13dB @0dBm input Saturation Output 14dBm @3dBm input Variable Power Gain Control 4dB Excellent Power Gain Thermal Stability Gain Flatness 1dB (- 40C to + 85C) RF IN Input Impedance 70 RF OUT Output Impedance 110 Recommended Operating Frequency 300MHz to 500MHz Bipolar Technology Package Outline SOT23-6 (MTP6) 2.8mm x 2.9mm Note: For the signals at frequencies other than recommended operating frequency range of 300 to 500MHz, please refer to the "TYPICAL CHARACTERISTICS".
Orientation Mark
!
PIN CONFIGULATION
1 2 3
6 5 4 Top View
Pin Function 1. RF IN 2. GND 3. EMI 4. RF OUT 5. V+ 6. IREF
!
Function Block Diagram
RF IN 1 GND 2 EMI 3 Bias Regulator
IREF 6 V+ 5 RF OUT 4
Ver.2008-08-22
-1-
NJM2278
!
ABSOLUTE MAXIMUM RATINGS
PARAMETER SYMBOL
V+ PD Pinmax Ta Tstg
(Ta=25C) RATINGS
6.5 200 6 - 40 to + 85 - 40 to +125
UNIT
V mW dBm C C
Supply Voltage Power Dissipation RF Input Level Operating Temperature Storage Temperature
!
RECOMMENDED OPERATING CONDITIONS
PARAMETER SYMBOL
V+
(Ta=25C) MIN.
2.0
TEST CONDITIONS
TYP.
2.7
MAX.
5.5
UNIT
V
Supply Voltage
!
ELECTRICAL CHARACTERISTICS
PARAMETER
(Ta=25C, V+=2.7V, fin=400MHz, Pin=0dBm unless otherwise noted)
SYMBOL
I c c1 Icc2 PG1 PG2 PGsat NF l S 11l2 l S 22l 2 ISL P-1dB Zin Z out PGfreq PGrang
TEST CONDITIONS
No signal, Test circuit1 Test circuit1 Pin= - 30dBm,Test circuit1 Pin= 0dBm, Test circuit1 Pin= 3dBm, Test circuit1 Test Circuit2 Test Circuit3 Test Circuit3 Test Circuit3 Test Circuit1 Test Circuit3 Test Circuit3 fin =300 to 500MHz 400MHz standard Test Circuit3 Rref=0 to 100 Test Circuit4
MIN.
-
TYP.
6 20 17.5 13.5 14.5 3 -13 -5 - 27 -9 70 110 - 2.8 - 4.3
MAX.
24 -
UNIT
mA mA dB dB dBm dB dB dB dB dBm dB dB
Operating Current 1 Operating Current 2 Power Gain 1 Power Gain 2 Saturation Output Noise Figure Input Return Loss Output Return Loss RF OUT - RF IN Isolation
Power Input at 1dB Compression Point
Input Impedance Output Impedance Gain Flatness Gain Control Rang
! REFERENCE (Thermal Characteristics)
PARAMETER
Gain Variation Over Temperature
SYMBOL
PG temp
TEST CONDITIONS
Ta= - 40 to 85C
Test Circuit1
MIN.
-1
TYP.
0
MAX.
+1
UNIT
dB
Ver.2008-08-22
-2-
NJM2278
!
TEST CIRCUIT
These test circuits allow the measurement of all parameters described in "ELECTRICAL CHARACTERISTICS".
# Test Circuit 1 for Icc1, Icc2, PG1, PG2, PGsat, P-1dB, PGtemp
V+ C7 1000p RF IN 1 GND 2 SG Z=50 Bias C2 6.8p EMI 3 Regulator IREF 6 V+ 5 RF OUT 4 11p C4 Spectrum 4.3p Analyzer Z=50 C3 RF OUT C6 1000p L2 22n
L1 RF IN
C1
24n 1000p
# Test Circuit 2 for NF
Noise Source NF Meter V+ C7 1000p RF IN 1 GND 2 Bias C2 6.8p EMI 3 Regulator IREF 6 V+ 5 RF OUT 4 11p C4 4.3p C3 RF OUT C6 1000p L2 22n
L1 RF IN
C1
24n 1000p
Ver.2008-08-22
-3-
NJM2278
# Test Circuit 3 for lS11l2 , lS22l2, ISL, Zin, Zout, PGfreg
Port1
Netw ork Analyzer Z=50
Port2 V+ C7 1000p
L1 RF IN
C1
RF IN 1 GND 2 Bias Regulator
IREF 6 V+ 5
C6 1000p L2 22n
24n 1000p
C2 6.8p
EMI 3
RF OUT 4
C3 RF OUT 11p C4 4.3p
# Test Circuit 4 for PGrang
C7 1000p RF IN 1 GND 2 SG Z=50 Bias C2 6.8p EMI 3 Regulator IREF 6 V+ 5 RF OUT 4 11p C4 Spectrum 4.3p Analyzer Z=50 C6 1000p Rref 0 to 100 L2 22n C3 RF OUT C5 1000p
L1 RF IN
C1
24n 1000p
Ver.2008-08-22
-4-
NJM2278
# Test Circuit 5 for S-Parameters (this item is not specified in "ELECTRICAL CHARACTERISTICS")
Port1
Netw ork Analyzer Z=50
Port2 V+ C7 1000p
RF IN RF IN 1 GND 2 Bias EMI 3 Regulator
IREF 6 V+ 5
C6 1000p
RF OUT 4 RF OUT
Ver.2008-08-22
-5-
NJM2278
!
TERMINAL FUNCTION
SYMBOL EQUIVARENT CIRCUIT VOLTAGE FUNCTION
Pin No.
1
RF IN
0.8V
RF Input The typical input impedance is 70@400MHz. Ground For best performance, keep traces physically short and connect immediately to ground plane. Emitter In most applications, keep traces physically short and connect immediately to ground plane. RF Output This is an unmatched collector output of the final amplifier. The typical output impedance is 110 @400MHz. The external matching circuit is connected to present the optimum load impedance for maximum power and efficiency. An additional circuit of a bias inductor and series resistor provides DC bias. This resistor also serves to control the power gain by adjusting collector current.
2
GND
--
3
EMI
5
6
4
0V
4
RF OUT
2
1
3
2.7V
5
V+
2.7V
Supply Voltage An external bypassing capacitance of 0.1uF is recommended. Reference of Current Source An external decoupling capacitor is placed between this pin and ground, and placed as close as possible to this pin.
6
IREF
0.8V
Note: 1. DC voltage of each pin is measured under the following condition Ta=25C, V+=2.7V, no RF signal input, test circuit1 2. ESD protection diode exist between each of the following pins and V+ pin 1, 3, 6 3. ESD protection diode exist between each of the following pins and ground pin 1, 3, 4, 5, 6
Ver.2008-08-22
-6-
NJM2278
! 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 evaluation board is designed to have the maximum value of PG at 400MHz,and its circuit is the same as Test Circuit 4 (V+=2.7V). Note that this board is not prepared to show the recommendation of pattern and parts layout.
#
Circuit Diagram
V+
IC1 RF IN 1 GND 2 Bias C2 6.8p EMI 3 Regulator NJM2278 IREF 6 V+ 5 RF OUT 4 11p C6 1000p
C7 1000p Rref 0 to 100 L2 22n C3
L1 RF IN
C1
24n 1000p C5 1000p
RF OUT C4 4.3p
GND
#
List of Component Items Designation IC1
L1 L2 C1 C2 C3 C4 C5 C6 C7 Rref
IC Inductor
Value NJM2278
24nH 22nH 1000pF 6.8pF 11pF 4.3pF 1000pF 1000pF 1000pF 100
Supplier New Japan Radio
Murata Murata Taiyo Yuden Taiyo Yuden Taiyo Yuden Taiyo Yuden Taiyo Yuden Taiyo Yuden Taiyo Yuden Murata
Note
LQW18A series LQW18A series GRM21 series UCN033 series UCN033 series UCN033 series GRM21 series GRM21 series GRM21 series PVG3A101C01
Capacitor
Potentiometer
Ver.2008-08-22
-7-
NJM2278
# PC Board Circuit Side View
GND
V+
Rref
C7 C6
IC1
C5 L2 C3 C4
RF OUT
RF IN
C2
L1
C1
Ground Side View
Ver.2008-08-22
-8-
NJM2278
!
TYPICAL CHARACTERISTICS ( Ta=25C, V+=2.7V, unless otherwise noted )
Operating Current Icc1 versus Supply Voltage V+ 10 9 8 7
Circuit 1, no signal 85C 25C - 40C
Operating Current Icc1 versus Amibient Temperature Ta 10 9 8 7
Icc1[mA]
Circuit 1, no signal
5.5V 2.7V 2V
Icc1[mA]
6 5 4 3 2 1 0 0 1 2 3 4
6 5 4 3 2 1 0
5
6
7
-50
-25
0
25
50
75
100
125
V+ [V]
Ta [C]
Operating Current Icc2 versus Supply Voltage V+ 25 24 23 22 21 20 19 18 17 16 15 1 2 3 4 V+[V] 5 6 7
Circuit 1, Pin=0dBm 85C 25C
25 24 23 22
Icc2[mA]
Circuit 1, Pin=0dBm
Operating Current Icc2 versus Ambient Temperature Ta
5.5V
Icc2[mA]
- 40C
21 20 19 18 17 16 15 -50 -25 0 25 50 75
2.7V
2V
100
125
Ta[C]
Power Gain PG1 versus Supply VoltageV+ 23 22 21 20
PG1[dB]
Circuit 1, Pin= -30dBm
Power Gain PG1 versus Ambient Temperature Ta 23 22 21
25C Circuit 1, Pin= -30dBm
20
PG1[dB]
19 18 17 16 15 14 13 1 2 3 4 V+[V] 5
19 18 17 16 15 14 13
5.5V 2.7V 2V
- 40C
85C
6
7
-50
-25
0
25
50
75
100
125
Ta[C]
Ver.2008-08-22
-9-
NJM2278
Power Gain PG2 versus Supply Voltage V+ 18 17 16 15
PG2[dB]
85C Circuit 1, Pin= 0dBm - 40C 25C
Power Gain PG2 versus Ambient Temperature Ta 18 17 16 15
PG2[dB]
Circuit 1, Pin= 0dBm 5.5V
14 13 12 11 10 9 8 1 2 3 4 V+[V] 5 6 7
14 13 12 11 10 9 8 -50 -25 0 25 50
2.7V 2V
75
100
125
Ta[C]
Saturation Output PGsat versus Supply Voltage V+ 20 19 18
PGsat[dBm]
Circuit 1, Pin= 3dBm - 40C
Saturation Output PGsat versus Ambient Temperature Ta 20 19
25C Circuit 1, Pin= 3dBm 5.5V
18 17
PGsat[dBm]
17 16 15 14 13 12 11 10 1 2 3 4 V+[V] 5
85C
16 15 14 13 12 11 10
2V 2.7V
6
7
-50
-25
0
25
50
75
100
125
Ta[C]
Noise Figure NF versus Supply Voltage V+ 5 4
85C Circuit 2
Noise Figure NF versus Ambient Temperature Ta 5 4
25C Circuit 2
5.5V 2.7V 2V
NF[dB]
- 40C
NF[dB]
3 2 1 0 1 2 3 4 V+[V] 5
3 2 1 0
6
7
-50
-25
0
25
50
75
100
125
Ta[C]
Ver.2008-08-22
- 10 -
NJM2278
Input Return Loss S|11| versus Frequency fin 0 -5 -10 -15 -20 -25 -30 300 325 350 375 400 425 450 475 500 fin [MHz]
- 40C Circuit 3, Pin= 0dBm
2
Output Return Loss S|22|2 versus Frequency fin Circuit 3, Pin= 0dBm 0
- 40C
85C
-5 -10
85C 25C
S|11| [dB]
|S22| [dB]
25C
-15 -20 -25 -30 300 325 350 375 400 425 450 475 500 fin [MHz]
2
RF OUT - RF IN Isolation ISL versus Frequency fin 0 -5 -10
ISL [dB]
Circuit 3, Pin= 0dBm
2
RF OUT - RF IN Isolation ISL versus Ambient Temperature Ta 0 -5 -10
ISL [dB]
Circuit 3, Pin= 0dBm
-15 -20 -25
85C - 40C 25C
-15 -20 -25 -30 -50 -25 0 25 50 75 100 125 Ta[C]
-30 300 325 350 375 400 425 450 475 500 fin [MHz]
Output Power Pout versus Input Power Pin 20 15 10
Pout [dBm]
Circuit 1 - 40C
Output Power Pout versus Input Power Pin 20 15
25C Circuit 1 5.5V
10
Pout [dBm]
5 0 -5 -10 -15 -20 -25 -40 -30 -20 -10
85C
5 0 -5 -10 -15 -20 -25
2V
2.7V
0
10
-40
-30
-20
-10
0
10
Pin [dBm]
Ver.2008-08-22
Pin [dBm]
- 11 -
NJM2278
Power Gain PGfreq versus Frequency fin 20 19 18
Circuit 3, Pin= 0dBm
Output Power PGrang versus External Resistor Rref 20 18 16 14 12 10 8 6 4
85C
Circuit 4, Pin= 0dBm
PGrang [dBm]
17
PGfreq [dB]
5.5V
16 15 14 13 12 11
- 40C 25C
2.7V 2V
2 0 0 50 100 150 Rref [] 200
10 300 325 350 375 400 425 450 475 500 fin [MHz]
250
300
Ver.2008-08-22
- 12 -
NJM2278
! Impedance (reference) (Ta=25C, V+=2.7V)
RF IN Input Impedance Zin(Circuit 3, Pin=0dBm)
+j50 +j25 +j100 +j25
300MHz
RF OUT Output Impedance Zout(Circuit 3, Pin=0dBm)
+j50 +j100
300MHz
400zMHz
0
25
50
150
0
25
50
150
400MHz 500MHz 500MHz
-j25
-j100 -j50
-j25 -j50
-j100
S11(Circuit 5, Pin= -10dBm)
+j50 +j25 +j100
S22(Circuit 5, Pin= -10dBm)
+j50 +j25 +j100
1000MHz
0
25
800MHz 600MHz
50
10MHz 50MHz 100MHz 200MHz 400MHz
0
25
50
10MHz 50MHz 100MHz 600MHz 800MHz 200MHz 400MHz
1000MHz
-j25 -j50
-j100
-j25 -j50
-j100
[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.2008-08-22
- 13 -

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