METHOD AND APPARATUS FOR FREQUENCY-MODULATION CONTROL OF AN OSCILLATOR

摘要

An electronic device controlling a frequency modulation index has a frequency modulation index control loop (14) having an input (22) adapted to be connected to a frequency output (18) of a frequency controllable oscillator (16). The oscillator (16) has a center frequency (Fc) and an output (34) of the control loop (14) is adapted to be connected to an input (36) of a frequency-modulation unit (38), the control loop (14) being adapted to determine the modulation index. Further provided is a method of frequency-modulating with a modulation frequency (Fm) a controllable oscillator (16) having a center frequency (Fc) with a constant frequency modulation index.