提出了一种射频接收机中自动增益控制(Automatic Gain Control,AGC)电路的建模方法和设计方法。该建模方法对射频接收机中自动增益控制电路进行了建模分析和理论推导,得到3 种常见电路拓扑的时间常数公式。通过电子设计软件对该模型进...提出了一种射频接收机中自动增益控制(Automatic Gain Control,AGC)电路的建模方法和设计方法。该建模方法对射频接收机中自动增益控制电路进行了建模分析和理论推导,得到3 种常见电路拓扑的时间常数公式。通过电子设计软件对该模型进行仿真验证,得到的时域分析结果与模型计算相吻合。对采用模型参数的接收机电路进行了制作和测试,与模型计算和仿真结果匹配良好。该方法解决了射频接收机中自动增益控制电路不同时间常数的设计难题,对精细自动增益控制电路设计提供理论指导。展开更多
设计了一种可用于多模式卫星导航接收机的射频前端低噪声放大器,设计电路可在1.13~1.95 GHz工作,兼容了GPS,北斗及GLONOSS导航系统的工作频段。电路采用0.18μm CMOS工艺实现。仿真结果表明,频带内S11和S22均在-10 d B以下,功率增益〉10...设计了一种可用于多模式卫星导航接收机的射频前端低噪声放大器,设计电路可在1.13~1.95 GHz工作,兼容了GPS,北斗及GLONOSS导航系统的工作频段。电路采用0.18μm CMOS工艺实现。仿真结果表明,频带内S11和S22均在-10 d B以下,功率增益〉10 d B,带内最小噪声系数可达到2.2 d B,输出1 d B压缩点为-5.585 d Bm,在1.8 V电源电压下,主体电路消耗12 m A电流。因此,该低频噪声放大器模块可满足当前各种导航系统的工作要求。展开更多
This paper presents an RF receiver of zero-Intermediate Frequency(IF) architecture for Cognitive Radio(CR) communication systems.Zero-IF architecture reduce the image reject filter and IF filter,so it is excellent in ...This paper presents an RF receiver of zero-Intermediate Frequency(IF) architecture for Cognitive Radio(CR) communication systems.Zero-IF architecture reduce the image reject filter and IF filter,so it is excellent in low cost,compact volume,and low power dissipation.The receiver employs three digital attenuator and a high gain,high linearity low noise amplifier to achieve wide dynamic range of 70 dB and high receiving sensitivity of-81 dBm.A fully balanced I/Q demodulator and a differential Local Oscillator(LO) chips are used to minimize the negative effects caused by second-order distortion and LO leakage.In order to select an 8 MHz-channel from 14 continuous ones located in UHF band(694-806 MHz) accurately,approach of channel selectivity circuits is proposed.The RF receiver has been designed,fabricated,and test.The measured result shows that the noise figure is 3.4 dB,and the error vector magnitude is 7.5% when the input power is-81 dBm.展开更多
文摘提出了一种射频接收机中自动增益控制(Automatic Gain Control,AGC)电路的建模方法和设计方法。该建模方法对射频接收机中自动增益控制电路进行了建模分析和理论推导,得到3 种常见电路拓扑的时间常数公式。通过电子设计软件对该模型进行仿真验证,得到的时域分析结果与模型计算相吻合。对采用模型参数的接收机电路进行了制作和测试,与模型计算和仿真结果匹配良好。该方法解决了射频接收机中自动增益控制电路不同时间常数的设计难题,对精细自动增益控制电路设计提供理论指导。
文摘设计了一种可用于多模式卫星导航接收机的射频前端低噪声放大器,设计电路可在1.13~1.95 GHz工作,兼容了GPS,北斗及GLONOSS导航系统的工作频段。电路采用0.18μm CMOS工艺实现。仿真结果表明,频带内S11和S22均在-10 d B以下,功率增益〉10 d B,带内最小噪声系数可达到2.2 d B,输出1 d B压缩点为-5.585 d Bm,在1.8 V电源电压下,主体电路消耗12 m A电流。因此,该低频噪声放大器模块可满足当前各种导航系统的工作要求。
基金Supported by the National High-Tech Project (No. 2009AA011801)National Natural Science Foundation of China (No. 60621002)
文摘This paper presents an RF receiver of zero-Intermediate Frequency(IF) architecture for Cognitive Radio(CR) communication systems.Zero-IF architecture reduce the image reject filter and IF filter,so it is excellent in low cost,compact volume,and low power dissipation.The receiver employs three digital attenuator and a high gain,high linearity low noise amplifier to achieve wide dynamic range of 70 dB and high receiving sensitivity of-81 dBm.A fully balanced I/Q demodulator and a differential Local Oscillator(LO) chips are used to minimize the negative effects caused by second-order distortion and LO leakage.In order to select an 8 MHz-channel from 14 continuous ones located in UHF band(694-806 MHz) accurately,approach of channel selectivity circuits is proposed.The RF receiver has been designed,fabricated,and test.The measured result shows that the noise figure is 3.4 dB,and the error vector magnitude is 7.5% when the input power is-81 dBm.
