ZED-F9R-Integration manual
Figure 40: ZED-F9R reference design for antenna bias
L1: Murata LQG15HS47NJ02 0402 47 N 5% 0.30 A -55/+125 C
D1: TYCO, 0.25PF, PESD0402-140 -55/+125C
C3: MURATA GRM033R61E104KE14 CER X5R 0201 100N 10% 25V
R2: RES THICK FILM CHIP 1206 10R 5% 0.25W
It is recommended to use active current limiting. If active current limiting is not used, the important
points covered below need to be taken into account:
Figure 41: ZED-F9R VCC_RF antenna bias
The bias-t inductor and current limiting resistor must be selected to be reliable with a short
circuit on the antenna feed if no active current limiter is used. Our recommended part has
a limit of 300 mA. A part with a higher current capability will be needed if the short circuit
current is as described here. This will also be affected by the voltage level of the antenna
UBX-20039643 - R06
4 Design Page 94 of 119
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