Multi standard transceiver architecture for wlan
First Claim
1. A radio front end transceiver comprising:
- a first receive path arranged to receive signals of a first modulation format at a first radio frequency band;
a second receive path arranged to receive signals of a second different modulation format at a second different radio frequency band;
a first transmit path arranged to transmit signals of the first modulation format and the first radio frequency band;
a second transmit path arranged to transmit signals of the second modulation format and the second radio frequency band;
circuitry for conversion between the respective radio frequency bands and an intermediate frequency provided in each of the paths;
intermediate frequency circuitry for conversion between the respective intermediate frequencies and basebands provided in each of the paths, wherein at least some of the intermediate frequency circuitry is common to both receive paths and at least some of the intermediate frequency circuitry is common to both transmit paths;
said intermediate frequency circuitry comprising dual band mixers; and
a frequency synthesizer arranged to derive local oscillator frequencies suitable for use by the intermediate frequency circuitry on each of the paths and wherein the transmit and receive local oscillator frequencies are arranged to overlap.
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Accused Products
Abstract
The present invention relates to a radio front end transceiver and methods of operating the transceiver. A transceiver is employed consisting of a first and second receive path and a first and second transmit path. Each first path and second path can handle signals of a first and a second modulation format and a first and a second radio frequency band respectively. The transceiver comprises circuitry for conversion between the respective radio frequency bands and an intermediate frequency. The transceiver is arranged with intermediate frequency circuitry for conversion between the respective intermediate frequencies and basebands. At least some of the intermediate frequency circuitry is common to both receive paths and at least some of the intermediate frequency circuitry is common to both transmit paths. A frequency synthesizer is arranged to derive overlapping local oscillator frequencies suitable for use by the intermediate frequency circuitry on each of the paths.
52 Citations
14 Claims
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1. A radio front end transceiver comprising:
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a first receive path arranged to receive signals of a first modulation format at a first radio frequency band;
a second receive path arranged to receive signals of a second different modulation format at a second different radio frequency band;
a first transmit path arranged to transmit signals of the first modulation format and the first radio frequency band;
a second transmit path arranged to transmit signals of the second modulation format and the second radio frequency band;
circuitry for conversion between the respective radio frequency bands and an intermediate frequency provided in each of the paths;
intermediate frequency circuitry for conversion between the respective intermediate frequencies and basebands provided in each of the paths, wherein at least some of the intermediate frequency circuitry is common to both receive paths and at least some of the intermediate frequency circuitry is common to both transmit paths;
said intermediate frequency circuitry comprising dual band mixers; and
a frequency synthesizer arranged to derive local oscillator frequencies suitable for use by the intermediate frequency circuitry on each of the paths and wherein the transmit and receive local oscillator frequencies are arranged to overlap. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification