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AssigneeAdvanced Micro Devices, Inc.
InventorLawrence H. Zuckerman
Estimating the term…
A very low intermediate frequency (IF) transceiver is described for use in a wireless LAN, cellular telephone, cordless telephone, and other radio transceiver applications. The transceiver preferably directly down-converts the RF signal to lower frequency such as a very low IF signal, which can be handled by transceiver components advantageously integrated with the communication control system such as an MAC or serial communications controller. Preferably, the very low IF signal is above peak modulation deviation and below the channel interval for the communication system. The very low IF signal may be up converted so that the RF signal can be more reliably demodulated. Alternatively, the RF signal can be additionally converted to a second IF frequency before the very low IF frequency to reduce the effects of noise in the transceiver. Alternatively, an image rejection mixer circuit can be employed to provide some rejection selectivity for the adjacent channels on one side of the local oscillator. Alternatively, a phasing circuit can be added in the receiver front end to assist in the isolation of the local oscillator signal from the antenna.
A receiver for use in a wireless network, information being communicated on the wireless network on a modulated carrier wave at one of a plurality of channel frequencies, the modulated carrier wave having important sidebands extending a certain amount on either side of the carrier (channel center) frequency, the receiver comprising:
A receiver for receiving a baseband frequency signal transmitted on a modulated carrier wave having one of a plurality of channel frequencies, the modulated carrier wave having important sidebands extending a certain amount on either side of the carrier (channel center) frequency, the receiver comprising:
A method of receiving information on a modulated carrier wave having peak important sidebands extending a certain amount on either side of the carrier (channel center) frequency, the receiver comprising steps of:
Dependencies are inferred from the claim text.