unicore UM620 Series, Hardware Reference Manual

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2
2 Reference Circuit Using a Passive Antenna
 When using a passive antenna, a low noise amplifier should be added between
the antenna and the RF_IN of the module in order to ensure the performance of
the system.

For the RF routing (antenna

LNA

RF_IN), note the 50 Ω impedance matching
 The supply voltage for VBCKP is 1.7 V ~ 3.6 V
VCC 2.7V~3.6V
VBCKP 1.7 V~3.6V
RF, Short 50ohm Line
Active Low
Figure 2-1 Reference Circuit Using a Passive Antenna