AFEM-S257
2.5-2.7 GHz WiMAX Coexistence Front End Module
Data Sheet
Description
Avago Technologies AFEM-S257 WiMAX Coexistence
Front End Module (FEM) is designed for mobile and xed
wireless data applications in the 2.5 to 2.7 GHz frequency
range. The FEM is optimized for IEEE 802.16 WiMAX modu-
lation. AFEM-S257 exhibits at gain and good match while
providing linear power e ciency to meet stringent mask
conditions and supports two antenna connections for RX
diversity or two simultaneous RX signals.
This module utilizes Avago Technologies proprietary GaAs
pHEMT, and FBAR technology for superior performance
across voltage and temperature levels while providing
excellent out of band rejection. AFEM-S257 is in a 5x7x1
mm MCOB package for space-constrained applications.
Functional Block Diagram
Preselector ByPass LNA
Preselector ByPass LNA
ANT SW
ISMN
Coex Linear Amplifier
RX Div. TX/
RX Switch
T/R-1
Coex BPF
Coex BPF
nfo & OMN
ANT-1
ANT-2
RX-1
T X
RX-2
T/R-2
Coex BPF
Features
GaAs E-pHEMT, pHEMT and FBAR technology
50 all RF ports
Typical Size: 5 x 7 x 1 mm
3 to 5 V supply (Tx Path)
Meets 802.16 masks at 24 dBm Pout , 16 QAM WiMAX
with 3.6 V and 420 mA
16 QAM WiMAX EVM -34 dB (2.5%) at 24 dBm
TX gain of 34 dB
PAE of 18% at SEM compliant Pout = 24 dBm
23 dB TX gain step in low power mode with reduced
Idsq
Low power Idd, 95 mA at Pout = 0 dBm, 23 dB Gain Step
35 dBc rejection at WiFi ISM band
3.5 dB Noise Figure from ANT to RX
25 dB of TX/RX Isolation
25 dB of Rx1/Rx2 Isolation
Applications
Portable and xed WiMAX applications
Package Diagram
12 9
1516
24
25
345678
11
12
13
14
17181920212223
26
27
28
29
10
GND
Rx2
GND
TX
GND
GND
Rx1
GND
VDD1_TX
TRSW21
PA_EN
PA_MOD
VREF
LNA2_MOD
TRSW22
GND
ANT2
GND
GND
ANT1
GND
TRSW12
TRSW11
VDD2_TX
VDD_RX
LNA1_MOD
ANTSW1
ANTSW2
GND
30
GND
31
GND
32
GND
40
GND
41
GND
42
GND
33
GND
39
GND
38
GND
44
GND
43
GND
34
GND
37
GND
36
GND
35
GND
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