
2.3GHz to 2.7GHz MIMO Wireless
Broadband RF Transceiver
Typical Operating Characteristics (continued)
(V CC_ = 2.8V, T A = +25°C, f LO = 2.5GHz, f REF = 40MHz, CS = high, RXHP = SCLK = DIN = low, RF BW = 10MHz, Tx output at 50 ?
unbalanced output of balun, using the MAX2839AS Evaluation Kit.)
Rx EVM vs. P IN
(CHANNEL BANDWIDTH = 10MHz,
64 QAM FUSC)
Rx EVM vs. V OUT
(CHANNEL BANDWIDTH = 10MHz,
64 QAM FUSC)
22
20
18
LNA = MAX
- 8dB
LNA = MAX
- 16dB
12
LNA = MAX
P IN = -50dBm
16
14
12
10
8
6
4
2
0
LNA = MAX
LNA = MAX
- 32dB
8
4
0
-100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10
-30
-26
-22 -18 -14
-10
-6
P IN (dBm)
WiMAX EVM vs. OFDM JAMMER
(10MHz CHANNEL BANDWIDTH, 64 QAM FUSC)
P WANTED = P SENSITIVITY + 3dB = -70.3dBm AT ANTENNA
(INCLUDING 4dB FRONT-END LOSS),
EVM AT P SENSITIVITY = 6.37%, WITHOUT JAMMER
14
-40
V OUT (dBV RMS )
Rx EMISSION SPECTRUM AT LNA INPUT
(LNA = MAX GAIN)
12
10
f OFFSET =10MHz
-45
-50
-55
8
6
4
2
0
f OFFSET = 20MHz
-60
-65
-70
-75
-80
-85
-90
4/3 x LO
4 x LO
-70
-60 -50 -40 -30
-20
0
26.5
P JAMMER AT ANTENNA (dBm)
FREQUENCY (GHz)
______________________________________________________________________________________
11