| 多模式定位系统接收机中的分数频率综合器 |
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| 引用本文： | 冯焱,周海东,忤婷,申佳,陈贵灿.多模式定位系统接收机中的分数频率综合器[J].西安交通大学学报,2011,45(8):85-91,107. |
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| 作者姓名： | 冯焱 周海东 忤婷 申佳 陈贵灿 |
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| 作者单位： | 西安交通大学电子与信息工程学院,710049,西安 |
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| 摘 要： | 针对单一的全球定位系统中接收性能易受环境影响的问题,提出了一个应用于3个定位系统、7种模式的多模式定位接收机中的分数频率综合器.通过改进的电流泵电流校正方法和提高谐振回路Q值等各种降低相位噪声的方法,达到了每种模式工作的稳定性和低相位噪声性能;以改进的多模分频器和3阶MASH1-1-1Σ-Δ调制器实现了7个频点的精确输出和各模式的快速锁定;在多模分频器中使用简单的电路将分频比的范围从64~79扩展到64~95.仿真结果表明,在每种模式下带内相位噪声(相对于载波的相噪声)均小于-90 dB,带外频偏1 MHz处相位噪声均小于-119 dB,杂散抑制(相对载波)均大于56.4 dB,各个模式锁定时间均小于18μs,1.8 V电源条件下的功耗为15.12 mW.
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| 关 键 词： | 全球定位系统 分数频率综合器 多模式 相位噪声 |
A Fractional-N Frequency Synthesizer for Multi-Mode Positioning System Receivers |
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| FENG Yan,ZHOU Haidong,WU Ting,SHEN Jia,CHEN Guican.A Fractional-N Frequency Synthesizer for Multi-Mode Positioning System Receivers[J].Journal of Xi'an Jiaotong University,2011,45(8):85-91,107. |
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| Authors: | FENG Yan ZHOU Haidong WU Ting SHEN Jia CHEN Guican |
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| Affiliation: | (School of Electronics and Information Engineering,Xi′an Jiaotong University,Xi′an 710049,China) |
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| Abstract: | A fractional-N frequency synthesizer that is applied in multi-mode positioning receiver for seven modes in three positioning systems is presented in order to solve the problem that the receive performance is sensitive to the environment in a single GPS.All of the seven modes can work stably and achieve lower phase noise performance by improving the method to adjust the programmable charge pump current,and by raising the value of Q factor in tank to reduce phase noise.The fast lock-in and accurate output fre... |
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| Keywords: | global positioning system fractional-N frequency synthesizer multi-mode phase noise |
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