Phase-locked loop-frequency generator for transmitting-/receiving device, has control unit including sigma-delta-modulator and designed to determine control words depending on signal that is provided by sigma-delta-modulator

摘要

The generator (20) has a voltage-controlled oscillator (24) for generating an output signal, and a control unit (27) connected with a switchable delay unit (26). The control unit has a sigma-delta-modulator (28) and is designed to determine control words depending on a signal that is provided by the sigma-delta-modulator. The modulator has an accumulator receiving an input signal of the modulator and for providing the accumulated value in the accumulated signal. The control unit is designed to determine the control words depending on the accumulated signal.