Agilent MGA-725M4 Low Noise
Amplifier with Bypass Switch In
Miniature Leadless Package
Data Sheet
Features
• Operating frequency:
0.1 GHz ~ 6.0 GHz
• Noise figure:
1.2 dB at 800 MHz
1.4 dB at 1900 MHz
• Gain:
17.5 dB at 800 MHz
15.7 dB at 1900 MHz
• Bypass switch on chip
Loss = typ 1.6 dB (I
d
< 5
µA)
IIP3 = +10 dBm
• Adjustable Input IP3:
+2 to +14.7 dBm
• Miniature package:
1.4 mm x 1.2 mm
2.7 V to 5.0 V operation
Applications
• CDMA (IS-95, J-STD-008) Receiver
LNA
• Transmit Driver Amp
• TDMA (IS-136) handsets
MiniPak 1.4 mm x 1.2 mm Package
Description
Agilent Technologies’s
MGA-725M4 is an economical,
easy-to-use GaAs MMIC Low
Noise Amplifier (LNA), which is
designed for an adaptive CDMA
receiver LNA and adaptive CDMA
transmit driver amplifier.
The MGA-725M4 features a typical
noise figure of 1.4 dB and 14.4 dB
associated gain from a single
stage, feedback FET amplifier.
The output is internally matched
to 50Ω. The input is optimally
internally matched for lowest
noise figure into 50Ω. The input
may be additionally externally
matched for low VSWR through
the addition of a single series
inductor. When set into the bypass
mode, both input and output are
internally matched to 50Ω.
Simplified Schematic
The MGA-725M4 offers an
integrated solution of LNA with
adjustable IIP3. The IIP3 can be
fixed to a desired current level for
the receiver’s linearity require-
ments. The LNA has a bypass
switch function, which sets the
current to zero and provides low
insertion loss. The bypass mode
also boosts dynamic range when
high level signal is being received.
For the CDMA driver amplifier
applications, the MGA-725M4
provides suitable gain and linear-
ity to meet the ACPR requirement
when the handset transmits the
highest power. When transmitting
lower power, the MGA-725M4 can
be bypassed, saving the drawing
current.
The MGA-725M4 is a GaAs MMIC,
processed on Agilent’s cost
effective PHEMT (Pseudomorphic
High Electron Mobility Transistor).
It is housed in the MiniPak 1412
package. It is part of the Agilent
Technologies CDMAdvantage RF
chipset.
Ax
Pin Connections and
Package Marking
GROUND
OUTPUT
Control
Input
&
V
ref
GainFET
Output
& V
d
Ax
INPUT
GROUND
GND
GND
1
MGA-725M4 Absolute Maximum Ratings
[1]
Symbol
V
d
V
gs
I
d
P
d
P
in
T
j
T
STG
Parameter
Maximum Input to Output Voltage
Maximum Input to Ground DC Voltage
Supply Current
Power Dissipation
[1,2]
CW RF Input Power
Junction Temperature
Storage Temperature
Units
V
V
mA
mW
dBm
°C
°C
Absolute
Maximum
5.5
+.3
-5.5
70
300
+20
170
-65 to +150
Operation
Maximum
4.2
+.1
-4.2
60
250
+13
150
-40 to +85
Thermal Resistance:
[2]
θ
jc
= 180°C/W
Notes:
1. Operation of this device in excess of any of
these limits may cause permanent damage.
2. T
case
= 25°C.
Electrical Specifications,
T
c
= +25°C, Z
o
= 50Ω, I
d
= 20 mA, V
d
= 3V, unless noted.
Symbol
V
gs
test
[1]
NF test
[1]
Ga test
[1]
IIP3 test
[1]
IL test
[1,4]
Ig test
[1,4]
Nfo
[2]
Parameter and Test Condition
f = 2.0 GHz V
d
= 3.0V (V
ds
= 2.5V)
f = 2.0 GHz V
d
= 3.0V (= V
ds
- V
gs
)
f = 2.0 GHz V
d
= 3.0V (= V
ds
- V
gs
)
f = 2.04 GHz V
d
= 3.0V (= V
ds
- V
gs
)
f = 2.0 GHz V
d
= 3.0V (V
ds
= 0V, V
gs
= -3V)
f = 2.0 GHz V
d
= 3.0V (V
ds
= 0V, V
gs
= -3V)
Minimum Noise Figure
As measured in Figure 2 Test Circuit
(Computed from s-parameter and noise
parameter performance as measured in a
50Ω impedance fixture)
Associated Gain at Nfo
As measured in Figure 2 Test Circuit
(Computed from s-parameter and noise
parameter performance as measured in a
50Ω impedance fixture)
Output Power at 1 dB Gain Compression
As measured in Figure 1 Test Circuit
Frequency = 2.04 GHz
I
d
= 20 mA
I
d
= 20 mA
I
d
= 20 mA
I
d
= 20 mA
I
d
= 0.0 mA
I
d
= 0.0 mA
f = 1.0 GHz
f = 1.5 GHz
f = 2.0 GHz
f = 2.5 GHz
f = 4.0 GHz
f = 6.0 GHz
f = 1.0 GHz
f = 1.5 GHz
f = 2.0 GHz
f = 2.5 GHz
f = 4.0 GHz
f = 6.0 GHz
I
d
= 0 mA
I
d
= 5 mA
I
d
= 10 mA
I
d
= 20 mA
I
d
= 40 mA
I
d
= 60 mA
I
d
= 0 mA
I
d
= 5 mA
I
d
= 10 mA
I
d
= 20 mA
I
d
= 40 mA
I
d
= 60 mA
f = 2.0 GHz
f = 2.0 GHz
f = 2.0 GHz
Units
V
dB
dB
dB
dB
µA
dB
Min.
-0.65
Typ.
-0.51
1.4
Max.
-0.37
1.8
15.5
σ
0.035
0.06
0.42
0.35
13.5
8.5
14.4
9.9
1.6
2.0
1.2
1.2
1.3
1.3
1.4
1.6
17.6
16.6
15.7
14.8
12.8
10.6
15.2
3.4
9.14
13.13
15.25
16.16
35
3.1
6.6
9.9
13.0
14.7
-8.2
-15
-23.4
3.5
0.07
2.0
Gain
[2]
dB
P1dB
[1]
dBm
0.53
IIP3
[1]
Input Third Order Intercept Point
As measured in Figure 1 Test Circuit
Frequency = 2.04 GHz
dBm
0.35
RLin
[1]
RLout
[1]
ISOL
[1]
Input Return Loss as measured in Fig. 1
Output Return Loss as measured in Fig. 1
Isolation |S
12
|
2
As measured in Fig. 2
dB
dB
dB
0.41
1.3
0.4
Notes:
1. Standard deviation and typical data as measured in the test circuit of Figure 1. Data based on 500 part sample size from 3 wafer lots.
2. Typical data computed from S-parameter and noise parameter data measured in a 50Ω system.
3. V
d
= total device voltage = V
dg
4. Bypass mode voltages shown are used in production test. For source resistor biasing, Bypass mode is set by opening the source resistor.
2
1000 pF
RF
Input
47 pF
100 pF
1000 pF
V
gs
1.2 nH
100 pF
V
ds
RF
Input Bias Tee
ICM Fixture
V
d
Ax
27 nH
27 nH
2.7 nH
RF
Output
47 pF
V
gs
Bias
Tee
Figure 1. MGA-725M4 Production Test Circuit.
MGA-725M4 Typical Performance
Frequency = 2.0 GHz, T
c
= 25°C, Z
o
= 50Ω, V
d
= 3V, I
d
= 20 mA unless stated otherwise. All data as measured in Figure 2
test system (input and output presented to 50Ω).
3.0
2.5
2.0
GAIN (dB)
NF (dB)
INPUT IP
3
(dB)
Ax
RF
Output
Figure 2. MGA-725M4 50Ω Test Circuit for S, Noise, and Power
Parameters.
18
16
14
12
10
8
6
2.7V
3.0V
3.3V
0
1
2
3
4
5
6
4
2
0
0
1
2
3
4
2.7V
3.0V
3.3V
5
6
14
12
10
8
6
4
2
0
2.7V
3.0V
3.3V
0
1
2
3
4
5
6
1.5
1.0
0.5
0
FREQUENCY (GHz)
FREQUENCY (GHz)
FREQUENCY (GHz)
Figure 3. Noise Figure vs. Frequency and
Voltage.
4
Figure 4. Gain vs. Frequency and Voltage.
Figure 5. Input Third Order Intercept Point
vs. Frequency and Voltage.
18
16
14
INPUT IP
3
(dBm)
18
16
3
GAIN (dB)
14
12
12
10
8
6
4
2
-40°C
+25°C
+85°C
0
1
2
3
4
5
6
NF (dB)
10
8
6
2
1
-40°C
+25°C
+85°C
0
0
1
2
3
4
5
6
FREQUENCY (GHz)
4
2
0
0
1
2
3
4
-40°C
+25°C
+85°C
5
6
0
FREQUENCY (GHz)
FREQUENCY (GHz)
Figure 6. Noise Figure vs. Frequency and
Temperature.
8
Input
Output
6
VSWR (LNA)
Figure 7. Gain vs. Frequency and Temperature.
Figure 8. Input Third Order Intercept Point
vs. Frequency and Temperature.
0
14
12
-1
10
VSWR (LNA)
INSERTION LOSS (dB)
8
6
4
2
Input
Output
0
1
2
3
4
5
6
-2
4
-3
2
-4
-5
0
1
2
3
4
-40°C
+25°C
+85°C
5
6
0
0
1
2
3
4
5
6
FREQUENCY (GHz)
0
FREQUENCY (GHz)
FREQUENCY (GHz)
Figure 9. LNA on (Switch off) VSWR vs.
Frequency.
Figure 10. LNA off (Switch on) VSWR vs.
Frequency.
3
Figure 11. Insertion Loss (Switch on) vs.
Frequency and Temperature.
MGA-725M4 Typical Performance,
continued
Frequency = 2.0 GHz, T
c
= 25°C, Z
o
= 50Ω, V
d
= 3V, I
d
= 20 mA unless stated otherwise. All data as measured in Figure 2
test system (input and output presented to 50Ω).
14
12
10
P1dB (dBm)
14
12
10
P1dB (dBm)
18
16
14
INPUT IP
3
(dBm)
12
10
8
6
4
2
10 mA
20 mA
40 mA
0
1
2
3
4
5
6
8
6
4
2
0
2.7V
3.0V
3.3V
0
1
2
3
4
5
6
8
6
4
2
0
2.7V
3.0V
3.3V
0
1
2
3
4
5
6
0
FREQUENCY (GHz)
FREQUENCY (GHz)
FREQUENCY (GHz)
Figure 12. Output Power at 1 dB Compression
vs. Frequency and Voltage.
Figure 13. Output Power at 1 dB Compression
vs. Frequency and Temperature.
Figure 14. Input Third Order Intercept Point
vs. Frequency and Current.
4
18
16
18
16
14
INPUT IP3 (dBm)
3
GAIN (dB)
14
12
12
10
8
6
4
2
-40°C
+25°C
+85°C
0
20
40
I
d
CURRENT (mA)
60
80
NF (dB)
10
8
6
2
1
-40°C
+25°C
+85°C
0
0
20
40
I
d
CURRENT (mA)
60
80
4
2
0
0
20
40
I
d
CURRENT (mA)
-40°C
+25°C
+85°C
60
80
0
Figure 15. Noise Figure vs. Current and
Temperature.
Figure 16. Associated Gain vs. Current and
Temperature.
Figure 17. Input Third Intercept Point vs.
Current and Temperature.
18
16
14
12
P1dB (dBm)
VSWR
14
12
10
Input
Output
Gamma
1.00
0.80
8
6
6
4
4
2
0
0
20
40
I
d
CURRENT (mA)
V
ref
(V)
10
8
0.60
0.40
-40°C
+25°C
+85°C
0
10
20
30
40
50
60
-40°C
+25°C
+85°C
60
80
2
0
0.20
0
0
10
20
30
40
50
60
I
d
CURRENT (mA)
I
d
CURRENT (mA)
Figure 18. Output Power at 1 dB Compression
vs. Current and Temperature.
Figure 19. LNA on VSWR and Gamma Opt vs.
Current.
Figure 20. Control Voltage vs. Current and
Temperature.
4
MGA-725M4 Typical Scattering Parameters: Bypass Mode
T
c
= 25°C, V
d
= 3.0 V, I
d
= 0 mA, Z
o
= 50Ω (test circuit of Figure 2)
Freq
(GHz)
0.1
0.5
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
2.0
2.1
2.2
2.3
2.4
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
S
11
Mag.
0.991
0.741
0.580
0.536
0.498
0.468
0.442
0.418
0.395
0.378
0.362
0.349
0.334
0.326
0.357
0.345
0.338
0.326
0.321
0.319
0.288
0.272
0.263
0.256
0.249
0.243
0.229
0.227
0.218
0.221
0.224
S
11
Ang.
-11.1
-44.1
-5.8
-61.8
-64.6
-66.8
-69.2
-70.9
-72.6
-74.7
-76.0
-77.6
-78.9
-79.9
-85.4
-86.0
-86.6
-87.7
-87.9
-88.9
-93.8
-97.0
-101.4
-106.1
-110.9
-114.8
-117.1
-125.3
-130.1
-137.5
-144.2
S
21
Mag.
0.175
0.592
0.710
0.733
0.751
0.764
0.775
0.783
0.793
0.797
0.799
0.805
0.809
0.811
0.826
0.826
0.825
0.826
0.825
0.825
0.820
0.816
0.810
0.807
0.800
0.793
0.781
0.774
0.764
0.758
0.749
S
21
Ang.
74.9
37.9
22.8
18.9
15.4
12.5
9.7
7.1
4.7
2.7
0.5
-1.5
-3.3
-5.1
-8.5
-10.2
-11.5
-13.2
-14.7
-14.6
-21.2
-27.4
-33.5
-39.3
-45.2
-50.7
-57.0
-62.6
-68.1
-73.5
-79.1
S
12
Mag.
0.175
0.593
0.709
0.732
0.750
0.763
0.774
0.783
0.791
0.796
0.800
0.805
0.809
0.811
0.827
0.827
0.825
0.825
0.824
0.824
0.820
0.815
0.811
0.806
0.800
0.795
0.783
0.773
0.768
0.760
0.753
S
12
Ang.
75.5
38.1
22.9
19.0
15.6
12.4
9.8
7.3
5.0
2.7
0.7
-1.3
-3.1
-5.1
-8.3
-10.0
-11.5
-12.9
-14.4
-14.6
-21.4
-27.4
-33.6
-39.2
-45.2
-50.7
-57.0
-62.6
-67.9
-73.2
-78.9
S
22
Mag.
0.943
0.624
0.470
0.429
0.400
0.371
0.346
0.328
0.309
0.293
0.281
0.267
0.258
0.247
0.243
0.238
0.230
0.228
0.222
0.218
0.206
0.198
0.195
0.192
0.190
0.191
0.260
0.256
0.252
0.243
0.230
S
22
Ang.
-15.1
-51.1
-64.1
-67.3
-69.6
-72.3
-74.0
-75.8
-77.2
-78.2
-79.5
-80.4
-80.9
-81.8
-86.5
-87.8
-88.5
-89.3
-90.6
-90.1
-94.6
-98.8
-103.8
-108.9
-114.5
-119.7
-138.9
-146.5
-153.6
-159.8
-166.5
S
11
(dB)
-0.08
-2.61
-4.74
-5.41
-6.05
-6.60
-7.09
-7.58
-8.06
-8.45
-8.84
-9.14
-9.53
-9.74
-8.96
-9.25
-9.43
-9.73
-9.87
-9.92
-10.81
-11.31
-11.59
-11.84
-12.07
-12.30
-12.81
-12.88
-13.25
-13.11
-12.98
S
21
(dB)
-15.12
-4.55
-2.97
-2.70
-2.49
-2.34
-2.22
-2.12
-2.02
-1.98
-1.94
-1.88
-1.84
-1.82
-1.66
-1.66
-1.67
-1.66
-1.67
-1.67
-1.72
-1.76
-1.83
-1.86
-1.94
-2.01
-2.14
-2.23
-2.34
-2.40
-2.51
S
12
(dB)
-15.16
-4.54
-2.99
-2.71
-2.50
-2.35
-2.22
-2.13
-2.04
-1.98
-1.94
-1.89
-1.84
-1.82
-1.65
-1.65
-1.67
-1.67
-1.69
-1.68
-1.72
-1.77
-1.82
-1.88
-1.93
-2.00
-2.13
-2.23
-2.30
-2.39
-2.46
S
22
(dB)
-0.51
-4.09
-6.57
-7.34
-7.95
-8.61
-9.21
-9.68
-10.19
-10.65
-11.03
-11.46
-11.75
-12.13
-12.29
-12.47
-12.77
-12.86
-13.06
-13.24
-13.74
-14.06
-14.18
-14.33
-14.41
-14.39
-11.69
-11.83
-11.99
-12.28
-12.75
5
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