Title :
A wideband phase modulation technique adopting Fractional-N Direct Digital Frequency Synthesizer
Author :
Bohai Zhang ; Fei You ; Renbin Tong ; Songbai He
Author_Institution :
Sch. of Electron. Eng., Univ. of Electron. Sci. & Technol. of China, Chengdu, China
Abstract :
In this paper, an open-loop phase modulator, called Fractional-N Direct Digital Frequency Synthesizer (DDFS), for polar transmitter is proposed to resolve the limited bandwidth problem occurred in the traditional phase-locked loop (PLL)-based phase modulator. Besides, an effective noise shaping quantization method is taken into account to attenuate the fractional-spurs introduced by Fractional-N DDFS. The worst case RMS EVM per burst of the modulator is 0.32% when performing 10-Mbps 16PSK.
Keywords :
direct digital synthesis; phase locked loops; phase shift keying; quantisation (signal); radio transmitters; 16PSK; DDFS; PLL; bit rate 10 Mbit/s; fractional-N direct digital frequency synthesizer; fractional-spurs; limited bandwidth problem; noise shaping quantization; open-loop phase modulator; phase locked loop; polar transmitter; wideband phase modulation; Bandwidth; Frequency modulation; Frequency synthesizers; Phase modulation; Quantization (signal); Transmitters; Fractional-N Direct Digital Frequency Synthesizer; polar transmitter; successive requantizer; wideband phase modulation;
Conference_Titel :
Radio and Wireless Symposium (RWS), 2014 IEEE
Conference_Location :
Newport Beach, CA
Print_ISBN :
978-1-4799-2298-7
DOI :
10.1109/RWS.2014.6830083
