
9
Freq
Fmin
Γ
opt
Γ
opt
Rn/50
Ga
GHz
dB
Mag.
Ang.
dB
0.50
0.4
0.335
0.5
0.07
21.8
0.90
0.43
0.332
27.9
0.06
18.83
1.00
0.44
0.332
34.3
0.06
18.59
1.50
0.48
0.338
63.8
0.05
16.22
1.80
0.51
0.345
79.6
0.05
15.46
2.00
0.52
0.352
89.3
0.05
14.61
2.50
0.57
0.373
111.3
0.05
13.34
3.00
0.61
0.4
130
0.04
12.29
4.00
0.69
0.467
158.9
0.03
10.47
5.00
0.78
0.542
178.7
0.03
8.96
6.00
0.86
0.617
-167.8
0.02
8.05
7.00
0.95
0.68
-158.1
0.04
7.19
8.00
1.03
0.724
-149.3
0.06
6.41
9.00
1.12
0.738
-138.9
0.1
6.15
10.00
1.2
0.712
-124.2
0.18
5.07
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 = 4V, IDS = 40 mA
Figure 21. MSG/MAG and |S21|
2 vs.
Frequency at 4 V , 40 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 = 4V, IDS = 40 mA
Freq.
S11
S21
S12
S22
MSG/MAG
GHz
Mag.
Ang.
dB
Mag.
Ang.
dB
Mag.
Ang.
Mag.
Ang.
dB
0.5
0.82
-89.80
22.59
13.48
128.80
-27.54
0.042
54.00
0.36
-149.40
25.06
0.8
0.78
-116.90
19.49
9.43
113.60
-25.51
0.053
47.30
0.41
-162.57
22.50
1.0
0.77
-130.00
18.68
8.59
106.60
-24.73
0.058
45.20
0.43
-167.93
21.70
1.5
0.75
-149.70
15.42
5.90
94.13
-22.97
0.071
42.93
0.46
-177.83
19.20
1.8
0.74
-158.00
14.21
5.13
88.40
-22.05
0.079
42.23
0.46
177.53
18.13
2.0
0.74
-162.20
13.70
4.84
85.10
-21.51
0.084
41.93
0.47
174.77
17.61
2.5
0.72
-169.50
11.50
3.76
77.87
-20.26
0.097
41.33
0.48
168.10
15.88
3.0
0.69
-173.80
10.20
3.24
71.53
-18.20
0.123
40.47
0.49
164.80
14.20
4.0
0.70
164.10
7.34
2.33
52.63
-17.46
0.134
30.50
0.50
140.63
11.39
5.0
0.73
150.90
5.66
1.92
40.90
-16.95
0.142
25.67
0.50
137.60
9.81
6.0
0.71
141.80
4.54
1.69
28.00
-16.42
0.151
18.43
0.51
120.43
8.14
7.0
0.73
124.70
3.52
1.50
13.40
-15.65
0.165
8.40
0.52
113.63
7.45
8.0
0.74
113.70
3.29
1.46
5.20
-15.29
0.172
4.07
0.52
112.80
7.42
9.0
0.76
98.50
3.08
1.43
-6.37
-15.29
0.172
-4.27
0.53
97.33
7.18
10.0
0.79
84.30
2.45
1.33
-20.00
-15.04
0.177
-15.27
0.53
82.40
6.94
11.0
0.86
62.60
0.59
1.07
-34.50
-15.04
0.177
-27.37
0.53
69.40
6.64
12.0
0.87
62.70
-0.26
0.97
-40.00
-14.56
0.187
-31.00
0.59
63.63
6.29
13.0
0.88
52.60
-1.08
0.88
-52.10
-15.09
0.176
-41.67
0.64
52.57
5.80
14.0
0.89
45.10
-1.66
0.83
-61.60
-15.55
0.167
-49.77
0.69
43.13
5.59
15.0
0.92
39.20
-3.49
0.67
-70.50
-15.81
0.162
-58.03
0.71
33.47
5.35
16.0
0.94
33.50
-5.16
0.55
-78.00
-18.64
0.117
-64.67
0.75
27.23
4.93
17.0
0.94
28.40
-5.30
0.54
-84.20
-17.72
0.130
-71.07
0.77
20.77
4.97
18.0
0.93
24.90
-6.29
0.49
-88.30
-17.86
0.128
-75.90
0.79
15.87
3.70