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11
Freq
F
min
Γ
opt
Γ
opt
R
n/50
G
a
GHz
dB
Mag.
Ang.
dB
0.5
0.45
0.20
154.00
0.037
28.85
0.9
0.48
0.32
160.00
0.032
25.13
1
0.50
0.35
166.00
0.030
24.43
1.5
0.55
0.40
170.00
0.030
21.26
2
0.65
0.46
177.40
0.030
19.38
2.4
0.70
0.49
175.10
0.032
17.90
3
0.77
0.55
168.90
0.031
16.33
3.5
0.84
0.58
162.60
0.037
15.23
3.9
0.90
0.62
158.20
0.043
14.60
5
1.06
0.66
145.80
0.085
12.66
5.8
1.20
0.69
137.30
0.140
11.60
6
1.19
0.69
135.40
0.150
11.38
7
1.40
0.77
126.50
0.320
10.55
8
1.52
0.81
117.90
0.550
9.84
9
1.75
0.82
107.50
0.890
9.05
10
1.88
0.85
95.60
1.530
8.29
Notes:
1. F
min 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 F
min 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, V
DS = 5V, IDS = 135 mA
Figure 31. MSG/MAG & |S21|2(dB)
@ 5V, 135 mA.
FREQUENCY (GHz)
40
30
20
10
0
-10
0
5
10
15
20
MSG/MAG
&
|S21|
2 (dB)
S21
MAG
MSG
ATF-531P8 Typical Scattering Parameters, V
DS = 5V, IDS = 135 mA
Freq.
S
11
S
1
S
1
S
MSG/MAG
GHz
Mag.
Ang.
dB
Mag.
Ang.
dB
Mag.
Ang.
Mag.
Ang.
dB
0.1
0.805
56.0
34.11 50.734
152.1
39.17 0.011
62.6
0.468
45.2
36.64
0.2
0.815
94.0
32.03 39.967
132.6
34.89 0.018
46.6
0.419
79.7
33.46
0.3
0.831
116.9
29.97 31.517
120.5
33.56 0.021
36.3
0.387
102.0
31.76
0.4
0.839
131.7
28.10 25.418
112.1
32.77 0.023
30.7
0.364
117.9
30.43
0.5
0.844
140.9
26.58 21.322
106.4
32.40 0.024
27.2
0.354
127.0
29.49
0.6
0.846
148.3
25.20 18.207
101.8
32.04 0.025
24.9
0.346
135.4
28.62
0.7
0.850
154.0
24.00 15.852
98.0
31.70 0.026
23.3
0.342
141.6
27.85
0.8
0.852
158.7
22.93 14.014
94.8
31.70 0.026
22.3
0.339
146.5
27.32
0.9
0.855
162.5
21.98 12.559
92.0
31.70 0.026
21.6
0.337
150.5
26.84
1
0.854
165.6
21.10 11.351
89.6
31.37 0.027
20.9
0.335
153.9
26.24
1.5
0.855
177.1
17.71 7.681
79.5
31.06 0.028
21.1
0.331
165.0
24.38
1.9
0.857
176.3
15.71 6.099
73.0
30.46 0.030
22.3
0.331
170.4
23.08
2
0.851
174.9
15.46 5.931
71.7
30.17 0.031
22.3
0.336
170.9
22.82
2.4
0.851
169.4
13.89 4.946
65.6
29.63 0.033
23.3
0.315
175.8
21.76
3
0.852
161.8
11.92 3.943
57.1
29.12 0.035
24.3
0.323
178.2
19.82
4
0.857
151.1
9.35
2.935
43.9
27.74 0.041
24.4
0.343
169.9
16.43
5
0.859
141.0
7.30
2.318
30.9
26.56 0.047
22.8
0.367
162.1
14.19
6
0.870
131.8
5.57
1.899
18.5
25.51 0.053
19.7
0.391
154.0
12.82
7
0.867
123.6
4.11
1.605
6.5
24.44 0.060
16.3
0.417
146.2
11.24
8
0.877
115.6
2.80
1.381
5.2
23.48 0.067
11.8
0.440
137.7
10.41
9
0.881
106.7
1.82
1.233
17.0
22.38 0.076
6.1
0.458
129.1
9.75
10
0.885
95.6
0.75
1.090
30.1
21.41 0.085
1.3
0.482
118.1
8.94
11
0.892
85.2
0.30 0.966
42.9
20.72 0.092
9.1
0.500
107.5
8.31
12
0.875
74.2
1.33 0.858
54.3
20.00 0.100
17.0
0.540
98.6
6.52
13
0.883
63.8
2.49 0.751
65.9
19.66 0.104
24.8
0.593
87.1
5.87
14
0.886
57.9
3.58 0.662
76.4
19.09 0.111
31.8
0.636
75.8
5.23
15
0.913
47.4
4.78 0.577
86.8
18.71 0.116
40.3
0.660
66.8
6.01
16
0.908
43.1
5.81 0.512
94.4
18.56 0.118
47.8
0.699
57.0
4.78
17
0.891
32.2
6.99 0.447
105.1
18.49 0.119
54.9
0.747
48.4
2.98
18
0.928
20.6
8.64 0.370
112.1
18.86 0.114
62.6
0.717
39.9
2.41