Ultra low-power transceiver SoC designs for IoT, NB-IoT applications

Boot up sequence (load code Flash) • Prefer — Ramp PMU (BG, LDO, charge large capacitors) — XTAL (milliseconds) — Synthesizers (10's to 100's of usec) — Calibration (Frequency, AGC, etc.) — PA (ramp up power to minimize spurious emissions).