Title :
Integrated adaptive LO leakage cancellation for W-CDMA direct upconversion transmitters
Author :
Lanschutzer, Christian ; Springer, Andreas ; Maure, Linus ; Boos, Zdravko ; Weigel, Robert
Author_Institution :
Inst. for Commun. & Inf. Eng., Linz Univ., Austria
Abstract :
A method for on-chip implementation is presented to compensate both local oscillator leakage due to finite LO to RF port isolation and input DC offset. It uses an RF power detector and a digital control loop and is intended for use in direct upconversion transmitters. The entire control loop was integrated in a CMOS UNITS transceiver chip. This paper presents the cancellation principle, simulations, and measurement results.
Keywords :
3G mobile communication; CMOS integrated circuits; circuit feedback; circuit simulation; integrated circuit design; integrated circuit measurement; integrated circuit modelling; radio transmitters; radiofrequency integrated circuits; transceivers; CMOS UMTS transceivers; RF power detectors; W-CDMA direct upconversion transmitters; digital control loops; finite LO/RF port isolation; input DC offset; integrated adaptive LO leakage cancellation; local oscillator leakage cancellation feedback loops; 3G mobile communication; Detectors; Digital control; Local oscillators; Multiaccess communication; Power engineering and energy; RF signals; Radio frequency; Transmitters; Voltage;
Conference_Titel :
Radio Frequency Integrated Circuits (RFIC) Symposium, 2003 IEEE
Print_ISBN :
0-7803-7694-3
DOI :
10.1109/RFIC.2003.1213884
