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TransmitterArchitectureUsing Digital Generationof J. Rode, J. Hinrichs,and P. Asbeck
 

Summary: T4B.3
TransmitterArchitectureUsing Digital Generationof
RF'Signals
J. Rode, J. Hinrichs,and P. Asbeck
Universityof California,San Diego
La Jolla, CA 92093-0407
Abstract-This pper descrikanarchitecturefor a CDMA RF
t " s t t e r implementedin digital CMOS. "functions Of UP-
conversionand filteringare carried out in the digital domain. A
band-pass delta-sigma modulator is wed to prodore a one-bit
ootput containingthe desiredanalog signal,which is then fed to a
switching-mode power amplifier. Issues for the digital logic
required high clack rates 03.3 GHz)are diseased in detail.
baseband signalis shown in the upper right comer of fig. 2. The
baseband signal is then upsampled to four times the intended
transmitfrequency.Therepresentativefinal samplingfrequency
used is 3.2 GHz. The signal is then modulated in quadrature,
using thefollowing function:
(1)implementation to facilitate proper modulator operation at the y(n) = x(n) t(n) + x,(n) fr(n).
where:

  

Source: Asbeck, Peter M. - Department of Electrical and Computer Engineering, University of California at San Diego

 

Collections: Engineering