8
Notes:
1. Fmin values at 2 GHz and higher are based on measurements while the Fmin 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. Refer to the noise parameter application section for more information.
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.
ATF-53189 Typical Scattering and Noise Parameters at 25°C, VDS = 4.0V, IDS = 180 mA
Figure 31. MSG/MAG & |S21|2 vs. and
Frequency at 4.0V/180 mA.
FREQUENCY (GHz)
MSG/MAG & |S21|
2
(dB)
0182 4 6 8 10 12 14 16
40
30
20
10
0
-10
-20
MSG
MAG
S21
Freq S11 S21 S12 MSG/MAG
z
ag.
ng.
ag.
ng.
ag.
ng.
ag.
ng.
0.1 0.776 -48.1 32.22 40.839 154.1 -38.42 0.012 65.5 0.428 -39.3 35.32
0.2 0.798 -84.7 30.66 34.138 135.6 -33.98 0.020 50.5 0.411 -71.3 32.32
0.3 0.818 -110.2 28.96 28.059 121.7 -32.04 0.025 39.4 0.396 -94.8 30.50
0.4 0.832 -128.2 27.34 23.278 111.2 -31.37 0.027 31.7 0.384 -111.6 29.36
0.5 0.835 -151.9 24.82 17.424 100.1 -31.70 0.026 23.3 0.397 -146.6 28.26
0.6 0.840 -160.3 23.41 14.811 94.8 -31.70 0.026 20.5 0.401 -153.7 27.56
0.7 0.842 -166.9 22.20 12.876 90.2 -31.37 0.027 18.6 0.403 -159.0 26.78
0.8 0.843 -172.2 21.13 11.394 86.3 -31.37 0.027 17.5 0.402 -163.3 26.25
0.9 0.844 -176.9 20.19 10.225 82.7 -31.06 0.028 16.5 0.400 -166.8 25.63
1.0 0.847 178.8 19.33 9.256 79.3 -31.06 0.028 15.7 0.398 -169.8 25.19
1.5 0.847 161.9 16.01 6.316 64.7 -30.17 0.031 13.4 0.389 178.4 23.09
2.0 0.847 147.6 13.66 4.818 51.4 -29.37 0.034 11.0 0.377 169.3 21.51
2.5 0.843 133.8 11.88 3.928 38.4 -28.64 0.037 7.6 0.367 160.5 20.26
3.0 0.841 119.8 10.55 3.369 25.2 -27.90 0.040 2.5 0.365 152.5 17.00
3.5 0.851 110.0 9.64 3.036 14.5 -27.64 0.042 -2.4 0.385 143.8 16.30
4.0 0.862 100.1 8.63 2.702 3.7 -27.38 0.043 -7.3 0.405 135.2 15.51
5.0 0.882 80.4 6.17 2.034 -17.9 -26.89 0.045 -17.2 0.446 117.8 13.54
6.0 0.903 60.7 2.71 1.367 -39.4 -26.42 0.048 -27.0 0.486 100.5 10.76
7.0 0.939 44.0 0.23 1.027 -59.4 -27.13 0.044 -37.6 0.544 87.1 10.47
8.0 0.956 31.8 -2.09 0.786 -77.8 -27.74 0.041 -48.7 0.607 72.6 9.96
9.0 0.940 23.2 -4.64 0.586 -94.2 -29.12 0.035 -61.5 0.669 57.9 6.72
10.0 0.948 13.6 -6.76 0.459 -110.0 -30.75 0.029 -79.0 0.721 45.5 6.06
11.0 0.942 2.6 -8.68 0.368 -126.9 -33.98 0.020 -117.0 0.756 35.1 4.78
12.0 0.920 -4.3 -10.31 0.305 -141.2 -38.42 0.012 -172.6 0.784 24.8 2.35
13.0 0.959 -15.4 -12.25 0.244 -161.1 -35.39 0.017 104.4 0.794 15.1 3.68
14.0 0.952 -20.1 -14.29 0.193 -171.7 -35.39 0.017 73.2 0.812 7.6 0.77
15.0 0.943 -21.0 -15.49 0.168 179.4 -35.92 0.016 82.9 0.847 1.3 -0.29
16.0 0.956 -24.2 -16.19 0.155 169.6 -33.98 0.020 81.5 0.852 -2.9 0.29
17.0 0.959 -31.9 -15.97 0.159 155.5 -31.37 0.027 87.0 0.865 -7.8 1.55
18.0 0.918 -43.5 -15.70 0.164 137.8 -28.40 0.038 78.1 0.847 -14.7 -2.03
S22
Freq Fmin Rn/50 Ga
GHz dB Mag Ang dB
0.5 0.65 0.394 163.6 0.50 25.82
0.9 0.76 0.417 172.4 0.60 21.83
1.0 0.79 0.423 175.3 0.70 21.71
1.5 0.86 0.465 -165.4 0.90 18.70
2.0 0.94 0.509 -147.7 1.00 17.63
2.4 1.00 0.545 -134.6 1.00 16.45
3.0 1.10 0.600 -116.7 1.10 14.90
3.5 1.17 0.645 -103.3 1.10 13.53
3.9 1.23 0.681 -93.4 1.20 12.79
5.0 1.41 0.777 -70.0 1.20 11.35
5.8 1.53 0.840 -56.1 1.20 10.31
6.0 1.56 0.855 -52.9 1.30 10.38
7.0 1.72 0.920 -39.0 1.30 9.79
8.0 1.87 0.970 -27.5 1.40 7.91
9.0 2.03 0.993 -19.1 1.50 6.11
10.0 2.18 0.997 -7.5 1.60 4.56
Gamma Opt