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.
Claims52
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 an 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 LO signal and generate an IF (Intermediate Frequency) signal therefrom;
- a second downconversion unit connected to receive said IF signal and generate a zero-IF or low-IF signal therefrom;
- and
- a signal processing unit adapted to perform signal processing on said zero-IF or low-IF signal.
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 first upconversion unit connected to receive the processed zero-IF or low-IF signal and generate an IF (Intermediate Frequency) signal therefrom;
- a frequency synthesizer unit adapted to generate an 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;
- and
- a second upconversion unit connected to receive said IF signal and said LO signal and generate said output signal therefrom.
A method of operating a dual band WLAN (Wireless Local Area Network) communications device to receive and process an input signal at a frequency in one of two different frequency bands, comprising:
- generating an 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;
- downconverting said input signal using said LO signal to generate an IF (Intermediate Frequency) signal;
- downconverting said IF signal to generate a zero-IF or low-IF signal;
- and
- performing signal processing on said zero-IF or low-IF signal.
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 an 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;
- and
- upconverting said IF signal using said LO signal to generate said output signal.
Dependencies are inferred from the claim text.