Systems and methods for frequency synthesis to improve coexistence

摘要

A frequency synthesizer for a WLAN transceiver is disclosed that may be used to generate 5.4 GHz and 2.4 GHz signals. The frequency synthesizer may be configured to minimize VCO pulling by using VCO operating frequencies that are not integer multiples of the RF bands. Further, the frequency synthesizer may be configured to minimize interference with other frequency bands used by existing wireless systems.

主权项

1. A frequency synthesizer, comprising:
a first voltage controlled oscillator (VCO) to generate a signal having a first frequency; a first mixer coupled to the first VCO; a first divide block, coupled to the first VCO and the first mixer to output a first feedback signal for controlling the first VCO, and
a divided signal to the first mixer; a second VCO to generate a signal having a second frequency and to output a second feed back signal for controlling the second VCO; a second mixer coupled to the second VCO; and a second divide block, coupled to the second VCO and the second mixer, to output a divided signal to the second mixer; wherein the first VCO to output the signal having the first frequency to the first divide block and to the first mixer, the first mixer to generate a first synthesized signal having a frequency that is a non-integer multiple of the first frequency, comprising combining the divided signal from the first divide block with the signal having the first frequency, the second VCO to output the signal having the second frequency to the second divide block and to the second mixer, and the second mixer to generate a second synthesized signal having a frequency that is a non-integer multiple of the second frequency, comprising combining the divided signal from the second divide block with the signal having the second frequency.