Title :
VCO gain nonlinearity calibration with frequency offset/drift compensation for 3G/GSM/EDGE polar modulation transmitter
Author :
Miyanaga, Kenji ; Lee, Wayne ; Kato, Akira ; Hirano, Shunsuke ; Ishida, Kaoru
Author_Institution :
Commun. Core Devices Dev. Center, Panasonic Corp., Yokohama, Japan
Abstract :
In recent 3G cellular handset, small-sized RF is strongly demanded. Polar modulation is one of the candidates to eliminate peripheral RF components. To apply polar modulation for wideband application, high linearity of phase modulator is required. In this paper, VCO gain nonlinearity calibration for phase modulator is proposed. The proposed procedure can calibrate the nonlinearity including frequency offset and frequency drift, which have an impact on EVM performances. Simulation and measurement results show the proposal can achieve excellent EVM of 5.8%.
Keywords :
3G mobile communication; cellular radio; phase modulation; radio transmitters; voltage-controlled oscillators; 3G cellular handset; 3G-GSM-EDGE polar modulation transmitter; EVM performances; VCO gain nonlinearity calibration; error vector magnitude; frequency offset-drift compensation; phase modulator; voltage-controlled oscillator; wideband application; Calibration; Frequency locked loops; Frequency modulation; Gain measurement; Phase modulation; Voltage-controlled oscillators; UMTS; VCO gain nonlinearity; calibration; frequency locked loop; phase modulator; polar modulation transmitter; two point modulation;
Conference_Titel :
Radio and Wireless Symposium (RWS), 2011 IEEE
Conference_Location :
Phoenix, AZ
Print_ISBN :
978-1-4244-7687-9
DOI :
10.1109/RWS.2011.5725420
