Hyung Ki Ahn, Kun-Seok Lee, Hwayeal Yu, Hyoung-Seok Oh, Dong-Jin Keum, Byeong-ha Park
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引用次数: 14
摘要
本文介绍了一种基于Delta-Sigma频率合成器的两点调制方案的压控振荡器增益校准技术。该技术使基于锁相环的相位调制器具有较宽的带宽和良好的信号质量。一个完全集成的GSM/EDGE极调制发射机，在0.13 μ m CMOS工艺中实现，展示了该校准技术的可行性。校准后，在400 kHz偏移时，它显示频谱掩模的余量为8 dB, EVM为2%。
VCO gain calibration technique for GSM/EDGE polar modulated transmitter
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%.
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