LNAs with Step Attenuator and VGA
Table 2. MAX2373 S-Parameters
(V
= 2.775V, RX_EN = high, LNA_I = high, RF_ATTN = low, P = -30dBm, T = +25°C.)
IN A
CC
LNA (S11)
LNA (S21)
LNA (S12)
LNA (S22)
FREQUENCY
(MHz)
MAGNITUDE
PHASE
-0.8171
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
MAGNITUDE
PHASE
-0.8184
10
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
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
100
-9.1461
-2.3140
200
-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
32.634
-3.8136
300
72.860
-5.6360
400
86.532
-7.2455
500
86.431
-8.9841
600
70.617
-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
700
105.050
73.619
800
900
143.410
102.100
151.320
178.790
-175.540
-176.470
-163.150
-162.620
-163.870
-160.350
-162.560
-177.660
1000
1100
1200
1300
1400
1500
1600
1700
1800
1900
2000
Table 3. MAX2371 Typical Noise Parameters
(V
= 2.775V, RX_EN = high, LNA_I = high, RF_ATTN = low, P = -30dBm, T = +25°C, data from design simulation.)
CC
IN
A
FREQUENCY (MHz)
NF
(dB)
⎜Γ
⎟
∠ Γ
R (Ω)
N
MIN
OPT
OPT
130
140
150
160
170
180
0.84
0.83
0.82
0.81
0.81
0.81
0.34
0.35
0.34
0.34
0.33
0.32
46.4
8.8
8.5
8.1
7.8
7.5
7.1
49.3
52.7
56.2
59.8
63.4
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7
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
