active antenna
- A passive antenna is recommended if the antenna can be placed close to the modules, for instance, when the distance between the modules and the antenna is less than 1 m.
- Otherwise, use an active antenna, since the insertion loss of RF cable can decrease the CNR of GNSS signal.
examples
C1 = 0R
C2 默认贴 33PF，是隔直电容。
RC = 10r / 47nH
有源天线供电 VDD 需和应用的有源天线匹配，且推荐客户使用 LDO/DCDC 给有源天线供电，这样在不使用 GNSS 功能时，可以通过关闭 LDO/DCDC 来达到减小耗流的作用。
MC20
L76
