The scenario
Designing a robust GNSS receiver circuit powered by a regulated 3.3V supply with battery backup to preserve ephemeris data during power loss.
What is in this drawing
Read the decisions behind it.
01
Diode-ORing of VCC and backup battery to VBAT pin
02
Inclusion of active antenna bias tee with DC injection via inductor and AC coupling via capacitor
03
TVS protection on RF input line
When building a standalone GNSS receiver with backup power and active antenna support.
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