Title :
Mixed Cartesian feedback for Zero-IF WCDMA transmitter
Author :
Abid, M. ; Delaunay, N. ; Gal, B. Le ; Dallet, D. ; Rebai, C. ; Deltimple, N. ; Kerherve, E. ; Belot, D.
Author_Institution :
CIRTA´´COM Res. Lab., Univ. of 7th November at Carthage, Carthage, Tunisia
Abstract :
In this paper, a new adaptive power amplifier (PA) linearization technique is presented. The idea is to consider a classic WCDMA Zero-Intermediate Frequency (Zero-IF) transmitter with a modified Cartesian feedback (CFB) loop. The new transmitter architecture consists of an analog stage including forward I/Q modulator and feedback I/Q demodulator and a digital stage adjusting the phase rotation around the loop. The digital phase-alignment system consumes 2.94 mW (tree time less than a full-analog system).
Keywords :
broadband networks; code division multiple access; feedback; linearisation techniques; modulators; power amplifiers; radio transmitters; CFB loop; PA linearization technique; adaptive power amplifier llinearization technique; analog stage; classic WCDMA zero-intermediate frequency transmistter; digital phase-alignment system; digital stage; feedback I/Q demodulator; forward I/Q modulator; full-analog system; mixed Cartesian feedback; modified Cartesian feedback loop; phase rotation; transmitter architecture; zero-IF WCDMA transmitter; zero-IF transmitter; Multiaccess communication; Phase estimation; Power amplifiers; Radio transmitters; Spread spectrum communication; Table lookup; Architecture matching algorithm; Cartesian feedback loop; WCDMA transmitter;
Conference_Titel :
Circuits and Systems (LASCAS), 2011 IEEE Second Latin American Symposium on
Conference_Location :
Bogata
Print_ISBN :
978-1-4244-9484-2
DOI :
10.1109/LASCAS.2011.5750300
