北斗导航接收机中自动增益控制芯片的研究与设计
发布时间：2018-11-26 07:10
【摘要】：北斗卫星导航定位系统是我国独立自主研发的全球卫星定位和通信导航系统，在如交通导航、授时、地质勘探、地理测绘等军用作业及民用生活中存在广阔的应用空间。卫星导航定位数据经过的无线信道传输距离远、电磁干扰复杂，又由于采用扩频技术，使得北斗射频信号的辐射功率谱极低，淹没于噪声基底以下，因此对北斗地面射频接收前端的接收灵敏度及自动增益调节动态范围性能等方面提出了较苛刻的要求。为了使北斗卫星地面导航定位系统可以适应各种恶劣复杂的地面作业环境，，用于射频接收前端电路的自动增益控制(AGC)芯片显得尤为重要，是地面接收系统灵敏度、动态范围、可靠性及误比特率性能的关键保证。 针对北斗卫星导航定位接收系统的应用，本文研究设计了一款具有大动态范围、高线性度的自动增益控制芯片，芯片包括可变增益放大器(VGA)、电荷泵(CP)及模数转换器(ADC)等模块，可以实现对下变频后中频信号的增益自动控制放大。针对卫星信号功率微弱、动态范围大的特点，本文提出了一种新型的具有跨导提高(gm-boosting)技术的可变增益放大电路结构，使电路的指数增益(dB-linear)范围和三阶交调性能得到显著改善；提出了一种改进型的电荷泵，通过额外的充放电电流能使电荷泵的输出电压快速稳定至可变增益放大器所能调节的范围，有效缩短了AGC芯片的稳定时间。 本文采用Global Foundry180nm CMOS工艺对提出的大动态自动增益控制芯片进行了前端电路设计、后端物理版图的设计与验证。芯片采用1.8V供电，后仿真结果显示：芯片中的VGA增益范围为-27dB~75dB，dB-linear范围达到75dB(误差±1dB)；AGC芯片的最大线性放大带宽为25MHz，输入三阶交调点达到-38dBm，稳定时间小于130s，消耗电流1.9mA，可以满足高端北斗卫星地面导航系统对接收灵敏度及动态范围冗余度的苛刻要求。
[Abstract]:Beidou satellite navigation and positioning system is a global satellite positioning and communication navigation system developed independently in China. It has a wide application space in military operations and civil life such as traffic navigation, timing, geological exploration, geographical mapping and so on. Satellite navigation and positioning data pass through a long distance of wireless channels, electromagnetic interference is complex, and because of the spread spectrum technology, the radiation power spectrum of Beidou radio frequency signal is extremely low, which is submerged under the noise base. Therefore, the requirements of the receiver sensitivity and the dynamic range performance of automatic gain regulation for the Beidou ground RF receiver front end are put forward. In order to make the Beidou satellite ground navigation and positioning system adapt to all kinds of harsh and complex ground operation environment, the automatic gain control (AGC) chip used in RF front-end circuit is especially important, which is the sensitivity of the ground receiving system. Key guarantees for dynamic range, reliability and bit error rate performance. Aiming at the application of Beidou satellite navigation and position receiving system, this paper designs an automatic gain control chip with large dynamic range and high linearity. The chip includes variable gain amplifier (VGA),). Charge pump (CP) and analog-to-digital converter (ADC) modules can automatically control and amplify the gain of downconversion if signal. Aiming at the characteristics of weak power and large dynamic range of satellite signal, a new type of variable gain amplifier with transconductance enhancement (gm-boosting) technology is proposed in this paper. The exponential gain (dB-linear) range and the third-order intermodulation performance of the circuit are improved significantly. An improved charge pump is proposed. The output voltage of the charge pump can be rapidly stabilized to the range that the variable gain amplifier can adjust by the extra charge and discharge current, and the stable time of the AGC chip can be effectively shortened. In this paper, Global Foundry180nm CMOS technology is used to design the front circuit of the proposed large dynamic automatic gain control chip, and the physical layout of the back end is designed and verified. The chip uses 1.8 V power supply, and the post-simulation results show that the gain range of VGA in the chip is -27dBU 75dBB-linear 75dB (error 卤1dB); The maximum linear amplification bandwidth of the AGC chip is 25MHz, the input third-order intermodulation point reaches -38dBm, the stabilization time is less than 130s, and the current consumption is 1.9 Ma. It can meet the strict requirements of receiving sensitivity and dynamic range redundancy of high-end Beidou satellite ground navigation system.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN965.5
本文编号：2357740
[Abstract]:Beidou satellite navigation and positioning system is a global satellite positioning and communication navigation system developed independently in China. It has a wide application space in military operations and civil life such as traffic navigation, timing, geological exploration, geographical mapping and so on. Satellite navigation and positioning data pass through a long distance of wireless channels, electromagnetic interference is complex, and because of the spread spectrum technology, the radiation power spectrum of Beidou radio frequency signal is extremely low, which is submerged under the noise base. Therefore, the requirements of the receiver sensitivity and the dynamic range performance of automatic gain regulation for the Beidou ground RF receiver front end are put forward. In order to make the Beidou satellite ground navigation and positioning system adapt to all kinds of harsh and complex ground operation environment, the automatic gain control (AGC) chip used in RF front-end circuit is especially important, which is the sensitivity of the ground receiving system. Key guarantees for dynamic range, reliability and bit error rate performance. Aiming at the application of Beidou satellite navigation and position receiving system, this paper designs an automatic gain control chip with large dynamic range and high linearity. The chip includes variable gain amplifier (VGA),). Charge pump (CP) and analog-to-digital converter (ADC) modules can automatically control and amplify the gain of downconversion if signal. Aiming at the characteristics of weak power and large dynamic range of satellite signal, a new type of variable gain amplifier with transconductance enhancement (gm-boosting) technology is proposed in this paper. The exponential gain (dB-linear) range and the third-order intermodulation performance of the circuit are improved significantly. An improved charge pump is proposed. The output voltage of the charge pump can be rapidly stabilized to the range that the variable gain amplifier can adjust by the extra charge and discharge current, and the stable time of the AGC chip can be effectively shortened. In this paper, Global Foundry180nm CMOS technology is used to design the front circuit of the proposed large dynamic automatic gain control chip, and the physical layout of the back end is designed and verified. The chip uses 1.8 V power supply, and the post-simulation results show that the gain range of VGA in the chip is -27dBU 75dBB-linear 75dB (error 卤1dB); The maximum linear amplification bandwidth of the AGC chip is 25MHz, the input third-order intermodulation point reaches -38dBm, the stabilization time is less than 130s, and the current consumption is 1.9 Ma. It can meet the strict requirements of receiving sensitivity and dynamic range redundancy of high-end Beidou satellite ground navigation system.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN965.5
【参考文献】
相关博士学位论文 前1条
1 李兵;多模兼容卫星导航接收机射频前端芯片关键技术研究[D];西安电子科技大学;2011年
本文编号：2357740
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