5GHz, 5-Channel MIMO Receiver
Typical Operating Characteristics (continued)
(V CC = 2.8V, T A = +25 N C, f LO = 5.35GHz, f REF = 40MHz, CS = high, SCLK = DIN = low, RF BW = 20MHz, Tx output at 50ω unbalanced
output of balun, using the MAX2851 Evaluation Kit, unless otherwise noted.)
-35
Tx CARRIER LEAKAGE
vs. RF FREQUENCY
-25
Tx CARRIER LEAKAGE vs. GAIN SETTING
-35
Tx UNWANTED SIDEBAND
vs. RF FREQUENCY
-40
T A = -20°C
-30
-35
T A = +85°C
T A = -20°C
-40
T A = +85°C
-45
-40
-45
-50
T A = +85°C
-45
-50
-55
T A = +25°C
-50
T A = +25°C
-55
T A = +25°C
T A = -20°C
-55
-60
-65
-60
-65
-60
-65
0
10
20
30
40
50
60
70
RF FREQUENCY (MHz)
Tx GAIN CODE
RF FREQUENCY (MHz)
-25
Tx UNWANTED SIDEBAND
vs. GAIN SETTING
0
Tx6 OUTPUT EMISSION SPECTRUM
AT MAX GAIN AND COLD
(100mV RMS 802.11A 54Mbps SIGNAL)
LO
-10
-30
T A = +85°C
T A = +25°C
-20
-30
-35
-40
-50
2 LO
3 LO
-40
-45
T A = -20°C
-60
-70
-80
4 LO
-90
-50
-100
0
10
20
30
40
50
60
70
0Hz
2.65GHz/div
26.5
Tx GAIN CODE
HISTOGRAM: CARRIER SUPPRESSION
RF FREQUENCY (GHz)
HISTOGRAM: SIDEBAND SUPPRESSION
102
85
68
51
34
17
0
MAX2851 toc65
156
130
104
78
52
26
0
MAX2851 toc66
-50.000
-34.000
-18.000
-62.000
-44.000
-26.000
SAMPLES = 3413, AVG = -34.9dBc,
STDEV = 3.61dB
SAMPLES = 3413, AVG = -44.6dBc,
STDEV = 2.58dB
______________________________________________________________________________________
17
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