7.6.1 Overview

The PLL generates the RF frequencies for the ATSAMR30M18A. During receive and transmit operations, the frequency synthesizer operates as a local oscillator. The frequency synthesizer is implemented as a fractional-N PLL with analog compensation of the fractional phase error. The Voltage Controlled Oscillator (VCO) is running at double the RF frequency.

Two calibration loops ensure correct PLL functionality within the specified operating limits.