采用分数- n直接数字频率合成器的宽带相位调制技术

2014 IEEE Radio and Wireless Symposium (RWS) Pub Date : 2014-06-12 DOI:10.1109/RWS.2014.6830083

Bohai Zhang, F. You, Renbin Tong, Songbai He

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引用次数: 0

摘要

针对传统锁相环(PLL)相位调制器带宽有限的问题，提出了一种用于极性发射机的开环相位调制器——分数n直接数字频率合成器(DDFS)。此外，还考虑了一种有效的噪声整形量化方法来衰减分数- n DDFS引入的分数杂散。当执行10-Mbps 16PSK时，调制器每次突发的最坏情况RMS EVM为0.32%。

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A wideband phase modulation technique adopting Fractional-N Direct Digital Frequency Synthesizer

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.

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2014 IEEE Radio and Wireless Symposium (RWS)

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