Patent ID: 7653361

Claim:
A dual band WLAN (Wireless Local Area Network) communications device capable of receiving and processing an input signal at a frequency in one of two different frequency bands, comprising: a frequency synthesizer unit adapted to generate a first LO (Local Oscillator) signal at a frequency between a first frequency band of said two different frequency bands and a second frequency band of said two different frequency bands; a first downconversion unit connected to receive said input signal and said first LO signal and generate an IF (Intermediate Frequency) signal therefrom; a frequency divider unit connected to said frequency synthesizer unit and configured to generate a second LO signal by dividing the frequency of said first LO signal by a predefined value; a second downconversion unit connected to receive said IF signal and further connected to receive said second LO signal from said frequency divider unit, the second downconversion unit being configured to generate a zero-IF or low-IF signal by applying the second LO signal freceived from said frequency divider unit to said IF signal; and a signal processing unit adapted to perform signal processing on said zero-IF or low-IF signal.