Method of self-calibrating a frequency synthesiser with FSK modulation at two points

摘要

The method involves comparing an output voltage of an analog-digital converter (20) with a voltage stored on a low-pass loop filter (15) to automatically calibrate a gain of the converter. A low frequency phase lock loop is closed in a modulation phase. An output of the converter is connected to an input of a voltage controlled oscillator (10) for modulating high frequency data at two points using a series of command words provided at the converter and a modulator (11) of the phase locked loop, where the words are derived from a Gaussian type digital filter (30) forming a data signal (31). An independent claim is also included for a frequency synthesizer for implementing a self-calibrating method, comprising a low frequency phase locked loop.