8
Freq
Fmin
Γ
opt
Γ
opt
Rn/50
Ga
GHz
dB
Mag.
Ang.
dB
0.50
0.36
0.35
0.2
0.06
21.97
0.90
0.4
0.341
24.3
0.06
18.96
1.00
0.41
0.34
31.1
0.05
18.77
1.50
0.45
0.341
62.5
0.04
16.31
1.80
0.48
0.346
79.3
0.05
15.79
2.00
0.5
0.351
89.6
0.05
14.93
2.50
0.54
0.37
112.8
0.04
13.67
3.00
0.59
0.395
132.4
0.04
12.62
4.00
0.68
0.461
162.3
0.03
10.78
5.00
0.77
0.538
-177.6
0.02
9.28
6.00
0.86
0.616
-164.4
0.02
8.34
7.00
0.95
0.683
-155.3
0.04
7.37
8.00
1.04
0.729
-147.2
0.07
6.63
9.00
1.13
0.742
-137.3
0.11
6.19
10.00
1.22
0.712
-122.6
0.19
5.23
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.
Typical Noise Parameters,
VDS = 3V, IDS = 60 mA
Figure 20. MSG/MAG and |S21|
2 vs.
Frequency at 3 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
ATF-331M4 Typical Scattering Parameters,
VDS = 3V, 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
-93.60
22.93
14.01
127.00
-28.64
0.037
54.00
0.39
-167.20
25.78
0.8
0.78
-120.70
19.68
9.64
112.10
-26.56
0.047
48.30
0.46
-172.07
23.12
1.0
0.77
-133.60
18.81
8.72
105.40
-25.68
0.052
46.80
0.48
-175.73
22.24
1.5
0.75
-152.50
15.50
5.96
93.43
-23.88
0.064
46.03
0.51
176.57
19.69
1.8
0.74
-160.50
14.27
5.17
88.00
-22.73
0.073
45.93
0.51
172.73
18.50
2.0
0.74
-164.40
14.02
5.02
84.80
-22.16
0.078
46.03
0.52
170.47
18.09
2.5
0.72
-171.30
11.06
3.57
77.97
-20.72
0.092
45.93
0.52
164.60
15.89
3.0
0.70
-175.30
9.80
3.09
71.93
-18.40
0.120
45.37
0.53
161.90
14.10
4.0
0.71
162.70
7.39
2.34
53.33
-17.52
0.133
35.20
0.54
137.43
11.21
5.0
0.73
149.70
5.70
1.93
41.90
-16.95
0.142
29.87
0.54
134.20
9.70
6.0
0.71
140.60
4.61
1.70
29.10
-16.31
0.153
21.73
0.55
116.23
8.18
7.0
0.73
123.70
3.54
1.50
15.10
-15.55
0.167
11.40
0.56
110.13
7.39
8.0
0.74
112.70
3.33
1.47
7.10
-15.09
0.176
6.37
0.56
109.10
7.35
9.0
0.76
97.60
3.12
1.43
-4.37
-15.04
0.177
-2.77
0.57
93.43
7.16
10.0
0.79
83.40
2.52
1.34
-17.80
-14.75
0.183
-14.27
0.57
78.70
6.95
11.0
0.86
61.80
0.66
1.08
-32.10
-14.80
0.182
-26.87
0.57
66.20
6.68
12.0
0.87
62.00
-0.15
0.98
-37.60
-14.29
0.193
-31.00
0.63
60.03
6.21
13.0
0.88
52.00
-0.96
0.90
-49.50
-14.80
0.182
-41.97
0.68
49.47
5.74
14.0
0.89
44.50
-1.56
0.84
-58.70
-15.34
0.171
-50.27
0.71
40.23
5.55
15.0
0.92
38.80
-3.38
0.68
-67.60
-15.65
0.165
-58.43
0.74
30.87
5.16
16.0
0.94
33.20
-5.04
0.56
-74.90
-18.42
0.120
-65.47
0.77
25.03
4.92
17.0
0.94
28.20
-5.15
0.55
-80.90
-17.65
0.131
-71.67
0.78
18.87
4.96
18.0
0.93
24.60
-6.11
0.50
-84.90
-17.79
0.129
-76.30
0.80
14.17
3.76