设计了一种可用于T-DMB射频接收机的快速调谐RC有源低通滤波器,采用级联方法实现,并使用数字逻辑控制的电容阵列补偿了因工艺及工作条件变化而变化的元器件参数。基于SMIC 0.18μm、1.8 V CMOS混合信号工艺,实现了七阶切比雪夫RC有源低...设计了一种可用于T-DMB射频接收机的快速调谐RC有源低通滤波器,采用级联方法实现,并使用数字逻辑控制的电容阵列补偿了因工艺及工作条件变化而变化的元器件参数。基于SMIC 0.18μm、1.8 V CMOS混合信号工艺,实现了七阶切比雪夫RC有源低通滤波器的设计,且其在RC时间常数±30%的变化情况下获得极小的截止频率(800 kHz)误差,并获得较快的调谐时间和高线性。调谐时间取决于数字逻辑控制的位数和比对时钟周期。展开更多
研制了一款可编程6阶巴特沃斯有源RC滤波器。为提高滤波器中运算放大器的增益带宽积,设计了一种新型的前馈补偿运算放大器。为消除工艺偏差和环境变化对截止频率的影响,设计了一种片上数字控制频率调谐电路,并采用TSMC 0.18μm CMOS工...研制了一款可编程6阶巴特沃斯有源RC滤波器。为提高滤波器中运算放大器的增益带宽积,设计了一种新型的前馈补偿运算放大器。为消除工艺偏差和环境变化对截止频率的影响,设计了一种片上数字控制频率调谐电路,并采用TSMC 0.18μm CMOS工艺进行了流片。滤波器采用低通滤波结构,测试结果表明,3 d B截止频率为1 32 MHz,步进1 MHz,带内增益0 d B,带内纹波0.8 d B,2倍带宽处带外抑制不小于24 d Bc,5倍带宽处带外抑制不小于68 d Bc,滤波器等效输入噪声为槡340 n V/Hz@1 MHz,调谐误差为±3%。滤波器裸芯片面积0.87 mm×1.05 mm。采用1.8 V电源电压,滤波器整体功耗小于20 m W。展开更多
A 4^(th)-order low-pass filter(LPF) based on active-G_m-RC structure for multi-standard system application is presented in this paper.The performances of LPF are controlled by a 1-bit controlvoltage,and the cut-off fr...A 4^(th)-order low-pass filter(LPF) based on active-G_m-RC structure for multi-standard system application is presented in this paper.The performances of LPF are controlled by a 1-bit controlvoltage,and the cut-off frequency,channel selectivity,and linearity of the proposed filter can be reconfigured accordingly.In order to improve the accuracy of the cut-off frequency,a binary-weighted switched-capacitor array is employed as the auto-tuning circuits to calibrate the RC-time constant.Fabricated in TSMC 0.18μm RF CMOS process,the proposed LPF achieves a measured cutoff frequency of 1.95 and 12.3MHz for WCDMA and GPS/Galileo application with a bandwidth deviation less than 4%.The measured 1dB compression points are-3.0dBm and-5.1dBm respectively for different modes.The core circuit of LPF consumes 1mW and 1.6mW for WCDMA and GPS/Galileo respectively.And the proposed LPF occupies an area of 0.78mm^2.展开更多
文摘设计了一种可用于T-DMB射频接收机的快速调谐RC有源低通滤波器,采用级联方法实现,并使用数字逻辑控制的电容阵列补偿了因工艺及工作条件变化而变化的元器件参数。基于SMIC 0.18μm、1.8 V CMOS混合信号工艺,实现了七阶切比雪夫RC有源低通滤波器的设计,且其在RC时间常数±30%的变化情况下获得极小的截止频率(800 kHz)误差,并获得较快的调谐时间和高线性。调谐时间取决于数字逻辑控制的位数和比对时钟周期。
文摘研制了一款可编程6阶巴特沃斯有源RC滤波器。为提高滤波器中运算放大器的增益带宽积,设计了一种新型的前馈补偿运算放大器。为消除工艺偏差和环境变化对截止频率的影响,设计了一种片上数字控制频率调谐电路,并采用TSMC 0.18μm CMOS工艺进行了流片。滤波器采用低通滤波结构,测试结果表明,3 d B截止频率为1 32 MHz,步进1 MHz,带内增益0 d B,带内纹波0.8 d B,2倍带宽处带外抑制不小于24 d Bc,5倍带宽处带外抑制不小于68 d Bc,滤波器等效输入噪声为槡340 n V/Hz@1 MHz,调谐误差为±3%。滤波器裸芯片面积0.87 mm×1.05 mm。采用1.8 V电源电压,滤波器整体功耗小于20 m W。
基金Supported by the National Basic Research Program of China(No.2010CB327404)the Priority Academic Program Development of Jiangsu Higher Education Institutions
文摘A 4^(th)-order low-pass filter(LPF) based on active-G_m-RC structure for multi-standard system application is presented in this paper.The performances of LPF are controlled by a 1-bit controlvoltage,and the cut-off frequency,channel selectivity,and linearity of the proposed filter can be reconfigured accordingly.In order to improve the accuracy of the cut-off frequency,a binary-weighted switched-capacitor array is employed as the auto-tuning circuits to calibrate the RC-time constant.Fabricated in TSMC 0.18μm RF CMOS process,the proposed LPF achieves a measured cutoff frequency of 1.95 and 12.3MHz for WCDMA and GPS/Galileo application with a bandwidth deviation less than 4%.The measured 1dB compression points are-3.0dBm and-5.1dBm respectively for different modes.The core circuit of LPF consumes 1mW and 1.6mW for WCDMA and GPS/Galileo respectively.And the proposed LPF occupies an area of 0.78mm^2.
