Title :
VCO gain calibration technique for GSM/EDGE polar modulated transmitter
Author :
Ahn, Hyung Ki ; Lee, Kun-Seok ; Yu, Hwayeal ; Oh, Hyoung-Seok ; Keum, Dongjin ; Park, Byeong-Ha
Author_Institution :
Samsung Electron., Yongin-City
fDate :
June 17 2008-April 17 2008
Abstract :
This paper describes a VCO gain calibration technique for the two-point modulation scheme using Delta-Sigma frequency synthesizer. The proposed technique enables PLL-based phase modulator to have wide bandwidth with good signal quality. A fully integrated GSM/EDGE polar modulated transmitter, implemented in a 0.13 mum CMOS process, is presented to show the feasibility of this calibration technique. After the calibration, it shows a margin of 8 dB to the spectrum mask at 400 kHz offset with EVM of 2%.
Keywords :
3G mobile communication; CMOS integrated circuits; calibration; cellular radio; frequency synthesizers; phase modulation; radio transmitters; voltage-controlled oscillators; Delta-Sigma frequency synthesizer; GSM/EDGE polar modulated transmitter; PLL- based phase modulator; VCO gain calibration technique; size 0.13 mum; spectrum mask; two-point modulation scheme; Bandwidth; Calibration; Digital modulation; Frequency synthesizers; GSM; Low pass filters; Phase modulation; Radio transmitters; Signal processing; Voltage-controlled oscillators; EDGE; GSM; calibration; polar transmitter; twopoint modulation;
Conference_Titel :
Radio Frequency Integrated Circuits Symposium, 2008. RFIC 2008. IEEE
Conference_Location :
Atlanta, GA
Print_ISBN :
978-1-4244-1808-4
Electronic_ISBN :
1529-2517
DOI :
10.1109/RFIC.2008.4561459
