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 Ω
unbalanced output of balun, using the MAX2839 Evalutation Kit.)
RX LNA SETTLING RESPONSE
RX LNA SETTLING RESPONSE
2V/div
(MAX TO MAX - 8dB)
LNA GAIN CONTROL
MAX2839 toc28
2V/div
(MAX TO MAX - 32dB)
LNA GAIN CONTROL
MAX2839 toc29
10
0
-10
-20
-30
RX BB FREQUENCY RESPONSE
CHANNEL BW = 28MHz
CHANNEL BW
= 1.5MHz
0V
1V/div
0V
1V/div
-40
-50
CHANNEL BW
= 5MHz
CHANNEL BW
= 10MHz
-60
-70
200ns/div
200ns/div
0.1
1 10
100
FREQUENCY (MHz)
RX BB FREQUENCY RESPONSE
HISTOGRAM: IQ GAIN IMBALANCE
HISTOGRAM: RX PHASE IMBALANCE
2
1
0
-1
CHANNEL BW
= 28MHz
474
395
316
MEAN = 0
DEV = 51.8mV
SAMPLE SIZE = 7839
774
645
516
MEAN = 0
DEV = 0.11878 °
SAMPLE SIZE = 7841
CHANNEL BW
-2
-3
-4
-5
= 1.5MHz
CHANNEL BW
= 5MHz
CHANNEL BW
237
158
79
387
258
129
= 10MHz
-6
0.1
1 10
100
1 σ /div
1 σ /div
FREQUENCY (MHz)
POWER-ON DC OFFSET CANCELLATION
POWER-ON DC OFFSET CANCELLATION
HISTOGRAM: RX STATIC DC OFFSET
WITH INPUT SIGNAL
WITHOUT INPUT SIGNAL
996
MEAN = 0
MAX2839 toc35
MAX2839 toc36
830
DEV = 0.23981mV
SAMPLE SIZE = 7841
5V/div
ENABLE
5V/div
ENABLE
664
498
0V
0V
332
166
200mV/div
VGA CODE = -36
10mV/div
VGA CODE = -36
I/Q OUTPUT
1 σ /div
LNA GAIN = MAX
1 μ s/div
I/Q OUTPUT
LNA GAIN = MAX
1 μ s/div
14
______________________________________________________________________________________
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