
8
Freq
Fmin
Γopt
Rn/50
Ga
GHz
dB
Mag.
Ang.
dB
0.5
0.50
0.20
166.00
0.041
28.26
0.9
0.59
0.25
169.00
0.044
24.27
1
0.60
0.35
171.00
0.036
24.15
1.5
0.72
0.40
173.00
0.039
21.14
2
0.81
0.57
-173.50
0.029
20.07
2.4
0.90
0.61
-167.70
0.033
18.73
3
1.01
0.63
-163.50
0.041
16.91
3.5
1.10
0.67
-158.20
0.054
15.86
3.9
1.13
0.70
-153.90
0.068
15.12
5
1.34
0.72
-142.70
0.139
13.08
5.8
1.48
0.75
-135.40
0.229
12.04
6
1.58
0.76
-133.30
0.278
11.82
7
1.68
0.80
-125.00
0.470
10.69
8
1.89
0.84
-116.10
0.860
9.97
9
2.15
0.82
-106.90
1.170
8.96
10
2.34
0.85
-95.10
2.010
8.09
Notes:
1. Fmin values at 2 GHz and higher are based on measurements while the Fmins below 2 GHz have been extrapolated. 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 a true Fmin is calculated.
2. S and noise parameters are measured on a microstrip line made on 0.025 inch thick alumina carrier. The input reference plane is at the end of the gate
lead. The output reference plane is at the end of the drain lead.
Typical Noise Parameters at 25
°C, VDS = 4V, IDS = 180 mA
Figure 28. MSG/MAG & |S21|
2 (dB)
@ 4V, 180 mA.
FREQUENCY (GHz)
40
30
20
10
0
-10
0
5
10
15
20
S21
MAG
MSG
MSG/MAG
&
|S21|
2
(dB)
ATF-531P8 Typical Scattering Parameters at 25
°C, V
DS = 4V, IDS = 180 mA
Freq.
S11
S21
S12
S22
MSG/MAG
GHz
Mag.
Ang.
dB
Mag.
Ang.
dB
Mag.
Ang.
Mag.
Ang.
dB
0.1
0.626
-59.4
33.20
45.702
154.5
-40.00
0.010
62.6
0.410
-44.4
36.60
0.2
0.704
-97.4
31.41
37.192
135.8
-35.92
0.016
48.8
0.384
-79.2
33.66
0.3
0.761
-119.4
29.53
29.950
123.5
-34.42
0.019
39.1
0.370
-101.8
31.98
0.4
0.794
-133.8
27.78
24.477
114.8
-33.56
0.021
33.7
0.360
-117.6
30.67
0.5
0.815
-142.5
26.32
20.693
108.9
-32.77
0.023
30.0
0.355
-127.1
29.54
0.6
0.824
-149.6
24.99
17.760
103.9
-32.77
0.023
27.4
0.351
-135.5
28.88
0.7
0.834
-155.1
23.82
15.516
99.9
-32.40
0.024
25.8
0.349
-141.9
28.11
0.8
0.840
-159.7
22.76
13.742
96.6
-32.40
0.024
24.6
0.349
-146.9
27.58
0.9
0.845
-163.3
21.83
12.346
93.6
-32.04
0.025
24.2
0.349
-151.1
26.94
1
0.848
-166.4
20.96
11.164
91.0
-32.04
0.025
23.8
0.347
-154.3
26.50
1.5
0.854
-177.7
17.59
7.579
80.6
-31.37
0.027
23.5
0.344
-165.8
24.48
1.9
0.857
175.9
15.60
6.024
73.9
-30.75
0.029
24.4
0.344
-171.2
23.17
2
0.853
174.4
15.36
5.863
72.6
-30.46
0.030
24.9
0.335
-171.8
22.91
2.4
0.853
168.9
13.79
4.894
66.5
-29.90
0.032
25.8
0.339
-176.8
21.85
3
0.855
161.6
11.83
3.902
57.9
-29.12
0.035
26.6
0.337
177.0
19.60
4
0.858
150.8
9.27
2.906
44.6
-27.74
0.041
26.5
0.356
168.5
16.23
5
0.864
140.7
7.20
2.292
31.6
-26.56
0.047
24.3
0.378
160.6
14.19
6
0.871
131.7
5.48
1.879
19.4
-25.35
0.054
21.2
0.402
152.4
12.69
7
0.869
123.5
4.04
1.593
7.5
-24.29
0.061
17.4
0.427
144.6
11.18
8
0.880
115.2
2.73
1.370
-4.3
-23.35
0.068
12.6
0.449
136.1
10.39
9
0.883
106.8
1.77
1.226
-16.1
-22.27
0.077
7.0
0.465
127.4
9.70
10
0.884
95.7
0.70
1.084
-29.0
-21.41
0.085
-0.8
0.489
116.6
8.70
11
0.874
85.1
-0.34
0.962
-41.6
-20.63
0.093
-8.8
0.505
106.0
7.20
12
0.874
74.1
-1.39
0.852
-52.8
-19.91
0.101
-16.6
0.544
97.2
6.30
13
0.877
63.3
-2.52
0.748
-64.5
-19.49
0.106
-24.6
0.596
85.9
5.46
14
0.884
57.9
-3.64
0.658
-74.6
-19.02
0.112
-31.9
0.638
74.7
4.95
15
0.894
46.8
-4.81
0.575
-85.4
-18.71
0.116
-39.8
0.662
65.9
4.29
16
0.896
43.3
-5.66
0.521
-93.6
-18.49
0.119
-47.8
0.699
56.1
4.06
17
0.898
31.9
-7.25
0.434
-102.6
-18.49
0.119
-55.1
0.748
47.7
2.82
18
0.918
20.8
-8.61
0.371
-110.5
-18.94
0.113
-62.6
0.718
39.3
1.75