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LNAs with Step Attenuator and VGA
Table 2. MAX2373 S-Parameters
(V CC = 2.775V, RX_EN = high, LNA_I = high, RF_ATTN = low, P IN = -30dBm, T A = +25°C.)
FREQUENCY
LNA (S11)
LNA (S21)
LNA (S12)
LNA (S22)
(MHz)
10
100
200
300
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
1600
1700
1800
1900
2000
MAGNITUDE
0.952248
0.933405
0.884179
0.824784
0.767609
0.709643
0.656682
0.616673
0.586388
0.558837
0.536056
0.524439
0.516220
0.511487
0.508259
0.504028
0.509736
0.510000
0.513009
0.515994
0.510141
PHASE
-0.8171
-9.1461
-16.6570
-22.6500
-27.4800
-30.9910
-34.5840
-37.2530
-39.7830
-41.8580
-42.9140
-44.4030
-45.9560
-47.1900
-47.9420
-49.1020
-50.1550
-51.3530
-52.9500
-54.6510
-55.6650
MAGNITUDE
7.273610
7.077013
6.529802
5.929253
5.400078
4.904559
4.431492
4.016983
3.644182
3.313218
3.059039
2.805078
2.614027
2.417436
2.253642
2.090210
1.975627
1.841259
1.719293
1.597405
1.467185
PHASE
-178.830
163.940
150.770
139.770
130.020
121.750
113.750
107.480
101.820
97.239
92.435
87.484
82.687
78.482
74.093
70.061
66.443
63.336
59.870
56.385
53.411
MAGNITUDE
0.002162
0.001346
0.002137
0.002217
0.001332
0.001641
0.002297
0.001701
0.002688
0.001077
0.001617
0.001442
0.002973
0.003764
0.004195
0.007366
0.008200
0.010929
0.015327
0.016692
0.018843
PHASE
-89.276
78.684
32.634
72.860
86.532
86.431
70.617
105.050
73.619
143.410
102.100
151.320
178.790
-175.540
-176.470
-163.150
-162.620
-163.870
-160.350
-162.560
-177.660
MAGNITUDE
1.000092
0.993482
0.991791
0.983762
0.971102
0.958562
0.955972
0.946259
0.941846
0.933168
0.938912
0.932492
0.926200
0.919094
0.919952
0.917498
0.919486
0.923092
0.924634
0.933781
0.933039
PHASE
-0.8184
-2.3140
-3.8136
-5.6360
-7.2455
-8.9841
-10.7250
-12.1890
-13.4650
-15.1090
-16.8900
-18.5160
-20.8080
-23.6930
-25.7200
-27.9410
-29.8050
-32.1340
-33.9510
-36.3470
-38.8240
Table 3. MAX2371 Typical Noise Parameters
(V CC = 2.775V, RX_EN = high, LNA_I = high, RF_ATTN = low, P IN = -30dBm, T A = +25°C, data from design simulation.)
FREQUENCY (MHz)
130
140
150
160
170
180
NF MIN (dB)
0.84
0.83
0.82
0.81
0.81
0.81
?Γ OPT ?
0.34
0.35
0.34
0.34
0.33
0.32
∠ Γ OPT
46.4
49.3
52.7
56.2
59.8
63.4
R N ( Ω )
8.8
8.5
8.1
7.8
7.5
7.1
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