Title :
A Cartesian feedback feasibility study for a zero-IF WCDMA transmitter handset IC
Author :
Tassin, Claire ; Garcia, Patrice ; Begueret, Jean-Baptiste ; Deval, Yann ; Belot, Didier
Author_Institution :
STMicroelectronics, Crolles, France
Abstract :
A Cartesian feedback feasibility study is presented describing the main requirements of a WCDMA zero-IF transmitter IC. The transmitter architecture consists of an analog part with a forward modulator, a feedback demodulator and a digital part to adjust the phase rotation around the loop and to remove the DC offset and I/Q gain mismatches in the feedback path. Linearization performances are 27 dB ACPR improvement at 5 MHz offset and 15 dB ACPR improvement at 10 MHz.
Keywords :
code division multiple access; demodulators; mixed analogue-digital integrated circuits; radio transmitters; radiofrequency integrated circuits; 10 MHz; 5 MHz; Cartesian feedback; feedback demodulator; forward modulator; mixed analogue-digital integrated circuits; radio transmitters; wideband code division multiple access; zero-IF WCDMA transmitter handset IC; Analog integrated circuits; Digital integrated circuits; Feedback loop; Filters; Linearity; Multiaccess communication; Power amplifiers; Radiofrequency amplifiers; Telephone sets; Transmitters;
Conference_Titel :
IEEE-NEWCAS Conference, 2005. The 3rd International
Print_ISBN :
0-7803-8934-4
DOI :
10.1109/NEWCAS.2005.1496754
