
10
Notes:
1. The Fmin values are based on a set of 16 noise figure measurements made at 16 different impedances using an ATN NP5 test system. From these
measurements Fmin is calculated. Refer to the noise parameter measurement section for more information.
2. S and noise parameters are measured on a microstrip line made on 0.010 inch thick alumina carrier assembly. The input reference plane is at the end of
the gate pad. The output reference plane is at the end of the drain pad.
ATF-331M4 Typical Scattering Parameters,
VDS = 4V, IDS = 60 mA
Freq.
S11
S21
S12
S22
MSG/MAG
GHz
Mag.
Ang.
dB
Mag.
Ang.
dB
Mag.
Ang.
Mag.
Ang.
dB
0.5
0.81
-93.00
23.11
14.30
127.30
-28.64
0.037
53.90
0.37
-161.30
25.87
0.8
0.78
-120.00
19.90
9.89
112.40
-26.56
0.047
48.30
0.43
-169.07
23.23
1.0
0.77
-133.00
19.03
8.94
105.60
-25.68
0.052
46.80
0.45
-173.33
22.35
1.5
0.75
-152.00
15.74
6.12
93.43
-23.88
0.064
45.83
0.48
178.37
19.81
1.8
0.74
-160.00
14.50
5.31
87.90
-22.85
0.072
45.73
0.48
174.33
18.68
2.0
0.74
-164.00
14.24
5.15
84.80
-22.27
0.077
45.83
0.49
171.87
18.25
2.5
0.72
-171.00
11.29
3.67
77.77
-20.82
0.091
45.73
0.49
165.90
16.06
3.0
0.69
-175.00
10.21
3.24
71.63
-19.25
0.109
45.27
0.51
162.80
14.73
4.0
0.71
163.00
7.64
2.41
52.93
-17.65
0.131
35.20
0.51
138.63
11.41
5.0
0.73
150.00
5.93
1.98
41.40
-17.08
0.140
30.07
0.51
135.70
9.89
6.0
0.71
141.00
4.81
1.74
28.60
-16.48
0.150
22.23
0.52
118.43
8.31
7.0
0.73
124.00
3.75
1.54
14.30
-15.65
0.165
11.90
0.53
111.93
7.56
8.0
0.74
113.00
3.52
1.50
6.20
-15.24
0.173
7.07
0.53
111.10
7.52
9.0
0.76
97.90
3.29
1.46
-5.37
-15.14
0.175
-1.87
0.54
95.43
7.31
10.0
0.79
83.70
2.67
1.36
-18.90
-14.89
0.180
-13.17
0.54
80.60
7.10
11.0
0.86
62.10
0.83
1.10
-33.30
-14.89
0.180
-25.67
0.54
67.90
6.92
12.0
0.87
62.30
0.00
1.00
-38.80
-14.42
0.190
-29.70
0.60
61.93
6.50
13.0
0.88
52.20
-0.82
0.91
-50.80
-14.89
0.180
-40.67
0.65
51.07
5.93
14.0
0.89
44.70
-1.41
0.85
-60.10
-15.39
0.170
-48.97
0.69
41.93
5.76
15.0
0.92
39.00
-3.22
0.69
-69.20
-15.65
0.165
-57.33
0.72
32.27
5.53
16.0
0.94
33.30
-4.88
0.57
-76.60
-18.42
0.120
-64.27
0.75
26.33
5.19
17.0
0.94
28.20
-5.04
0.56
-82.80
-17.59
0.132
-70.77
0.77
19.97
5.22
18.0
0.93
24.70
-6.02
0.50
-86.90
-17.72
0.130
-75.60
0.79
15.07
3.90
Freq
Fmin
Γ
opt
Γ
opt
Rn/50
Ga
GHz
dB
Mag.
Ang.
dB
0.50
0.38
0.316
0.7
0.06
22.33
0.90
0.42
0.314
28.9
0.06
19.23
1.00
0.43
0.314
35.5
0.06
19.1
1.50
0.47
0.321
65.7
0.05
16.63
1.80
0.5
0.329
81.9
0.05
15.86
2.00
0.52
0.336
91.9
0.05
14.96
2.50
0.56
0.358
114.3
0.04
13.73
3.00
0.61
0.386
133.2
0.04
12.58
4.00
0.7
0.454
162.3
0.03
10.78
5.00
0.79
0.53
-178.1
0.03
9.3
6.00
0.88
0.606
-165.1
0.02
8.32
7.00
0.97
0.67
-155.8
0.04
7.44
8.00
1.06
0.714
-147.4
0.07
6.59
9.00
1.16
0.728
-137.1
0.11
6.36
10.00
1.25
0.703
-121.9
0.19
5.27
Typical Noise Parameters,
VDS = 4V, IDS = 60 mA
Figure 22. MSG/MAG and |S21|
2 vs.
Frequency at 4 V , 60 mA.
MSG
MAG
FREQUENCY (GHz)
MSG/MAG
and
|S
21
|
2 (dB)
020
10
515
40
30
20
10
0
-10
|S21|
2