14.4.8.1 Overview

The PLL generates the RF frequencies for the AT86RF212B. 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 of the RF frequency.

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