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in the circuit and the mixer into consideration, the actual maximum gain
would be approximately 60dB. The total amount of attenuator available below
6GHz is 50dB. In circumstances with strong signal or severe interference, not
only bypass amplifier but also attenuator is needed. The proper amount of
gain and attenuation would be selected automatically according to the REF
setting. In short, the goal is to ensure no overload appears when the
amplitude of the signal is lower than the REF as well as to find to sweet spot
between sensitivity and interference resistance.
Under different REFs, the typical gain configuration of port 2 is shown as
the list below. In addition, the frequency below 6GHz in the list also applies to
port 1. (The demarcation point changes from 750MHz to 500MHz)
Frequency
REF
range
5kHz~750
MHz
20dBm
750MHz~6
GHz
6~10.8/18.6
GHz
5kHz~750
MHz
750MHz~6
10dBm
GHz
6~10.8/18.6
GHz
5kHz~750
0dBm
MHz
Attenuator
LNA1
50
0
50
0
30
20
40
0
50
0
30
20
30
0
LNA2
IF
10
20
0
0
0
10
20
0
0
0
20
10
Noise
Floor
(typical)
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