Patent ID: 7890078

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