Frequency multiplier precursor for fractional-N loops phasenarretierte

WLAN (Wireless Local Area Network, wireless local area network) communication device comprising a wireless frequency synthesizer which is arranged to generate a synthesized signal which is suitable for modulating a transmission signal and / or demodulating a reception signal, the WLAN frequency synthesizer comprises: a reference oscillator (110) designed for generating a first reference clock signal; a fractional-N PLL (Phase-Locked Loop, phasenarretierte Loop) unit (120) configured for receiving a second reference clock signal and for converting the second reference clock signal to the synthesizer signal; and a frequency multiplier (210) configured for receiving the first reference clock signal and for converting said first reference clock signal in the second reference clock signal to be forwarded to the fractional-N-PLL unit, by multiplying the frequency of the first reference clock signal by a multiplication factor, wherein the fractional-N-PLL unit a VCO (Voltage Controlled Oscillator, VCO) oscillator (160) is designed for outputting the synthesizer signal, and a loop filter (150) for generating a control voltage for controlling the operation of the VCO oscillator is designed, and comprising wherein the loop filter ...