DIGITAL PHASE LOCKED LOOP FREQUENCY SYNTHESIZER

摘要

The invention relates to a circuit for phase error compensation in fractional-N-based phase locked loop frequency synthesizers. By means of said circuit all required control and reference signals are derived from the VCO frequency (fVCO) of the voltage-controlled oscillator (4) using an auxiliary phase locked loop (auxiliary PLL). The circuit provided for in the invention is suitable especially for high-frequency phase locked loop frequency synthesizers used in integrated circuit technology.