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An 800MHz to 5GHz Software-Defined Radio Receiver in 90nm CMOS
by
R. Bagheri1,2, A. Mirzaei1,2, S. Chehrazi1, M. Heidari1,2, M. Lee1,
M. Mikhemar1, W. Tang1, A. Abidi1
1University of California, Los Angeles, CA
2WiLinx, Los Angeles, CA
A software-defined radio (SDR) can tune to any frequency band, select
any reasonable channel bandwidth, and detect any known modulation.
While progress has been made on DSP and baseband functions
for SDR, the low-power radio front-end has remained elusive.
An ADC at the antenna which digitizes all bands simultaneously with
equal fidelity will not be practical in the foreseeable future. Today’s
mobile SDR receiver needs a wideband, linear RF front-end that can
be tuned to any one channel at a time in the band from 800MHz to
5GHz. This should be followed by a filter with a passband that is tunable
over several decades by a clock. The filter should enable the
channel of interest to be digitized at the required SNR for acceptable
demodulation, whereas adjacent channels can be digitized at any
SNR because eventually they are eliminated by a digital filter. The
RF front-end and analog filter should limit the DR presented to the
ADC input, and allow sampling of the signals at a reasonable rate to
achieve power dissipation consistent with mobile requirements. On
the other hand, as much as possible, the ADC and DSP should relieve
the analog front-end from the traditional burdens of variable gain and
filtering. To serve the gamut of cellular and WLAN standards, the
ADC should be reconfigurable; for instance, GSM reception needs 14b
DR in a 200kHz bandwidth and 10MHz sample rate, whereas 802.11g
reception needs a DR of 8b across the Nyquist band at 40MHz rate.
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发表于 2006-11-29 13:04:54
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