Dual band WLAN communication frequency synthesizer technique
AssigneeAdvanced Micro Devices, Inc.
InventorsWolfram Kluge, Sascha Beyer, Jeannette Zarbock
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Abstract
A dual band WLAN (Wireless Local Area Network) communications technique is provided where a frequency synthesizer unit generates an LO (Local Oscillator) signal at a frequency between both frequency bands and two downconversion units and/or two upconversion units are provided. One of the units performs conversion between the LO signal and an IF (Intermediate Frequency) signal while the other conversion takes place between the IF signal and a zero-IF or low-IF signal. Signal processing is performed on the zero-IF or low-IF signal.
Claims22
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.
A method of operating a dual band WLAN (Wireless Local Area Network) communications device to transmit an output signal at a frequency in one of two different frequency bands, comprising:
- performing signal processing on a zero-IF or low-IF signal;
- upconverting the processed zero-IF or low-IF signal to generate an IF (Intermediate Frequency) signal;
- generating 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;
- generating a second LO signal by dividing the frequency of said LO signal by a predefined value, wherein said zero-IF or low-IF signal upconversion uses said second LO signal;
- and
- upconverting said IF signal using said LO signal to generate said output signal.
Dependencies are inferred from the claim text.