为了补偿温度变化对滤波器频率响应造成的漂移,提出了一种全差分运算放大器,该运算放大器采用电压负反馈方式稳定输出共模电平,调节输入对差分管衬底偏置来改变阈值电压差,从而调节放大器的跨导来调整滤波器的截止频率,实现了基于Gm-C...为了补偿温度变化对滤波器频率响应造成的漂移,提出了一种全差分运算放大器,该运算放大器采用电压负反馈方式稳定输出共模电平,调节输入对差分管衬底偏置来改变阈值电压差,从而调节放大器的跨导来调整滤波器的截止频率,实现了基于Gm-C结构的三阶Chebyshev低通滤波器,滤波器采用GSMC的0.13μm SOI工艺,电源电压1.2 V,6层金属设计,仿真结果表明,该滤波器通带增益0 d B,-1 d B截止频率8 MHz,38 MHz处增益衰减达到-35 d B,带内波动0.5 d B,输入为1 MHz,400 m V Vpp时,THD为-57 d B,功耗7 m W.在特殊环境具有明显的优势。展开更多
The high linearity low-noise filter is an indispensable key circuit in the communication system.Based on the structure of current-reuse source-degradation operational transconductance amplifier(OTA),a 5 GHz current-mo...The high linearity low-noise filter is an indispensable key circuit in the communication system.Based on the structure of current-reuse source-degradation operational transconductance amplifier(OTA),a 5 GHz current-mode low-noise Gm-C filter suitable for high-speed communication systems is proposed.Thanks to the proposed current mode structure and the OTA’s high-power efficiency and high linearity,the filter obtains good noise and high linearity performance with very low power consumption.The filter is designed in standard 65 nm CMOS technology and occupies a core area of 0.06 mm^(2).The simulation results show that the operating bandwidth is 5 GHz,the IIP3 is35 d Bm,and the power consumption is only 3.2 m W.展开更多
提出了一种改进的高线性度、宽调节范围的可调跨导运算放大器(OTA).其采用输入衰减和交叉耦合差分对两种线性化技术实现高线性度.此外采用源级退化电流镜结构对跨导值进行调节,实现了20倍的调节范围,同时保证了调节过程中维持相同的输...提出了一种改进的高线性度、宽调节范围的可调跨导运算放大器(OTA).其采用输入衰减和交叉耦合差分对两种线性化技术实现高线性度.此外采用源级退化电流镜结构对跨导值进行调节,实现了20倍的调节范围,同时保证了调节过程中维持相同的输入电压幅度.为了验证该OTA结构的有效性,设计了一个3阶低通滤波器.电路采用0.18μm SMIC CMOS工艺模型,仿结果显示,滤波器实现了从600 k Hz到10 MHz的线性调节,电流消耗为0.9-1 m A,其IIP3最高24.8 d Bm.展开更多
文摘为了补偿温度变化对滤波器频率响应造成的漂移,提出了一种全差分运算放大器,该运算放大器采用电压负反馈方式稳定输出共模电平,调节输入对差分管衬底偏置来改变阈值电压差,从而调节放大器的跨导来调整滤波器的截止频率,实现了基于Gm-C结构的三阶Chebyshev低通滤波器,滤波器采用GSMC的0.13μm SOI工艺,电源电压1.2 V,6层金属设计,仿真结果表明,该滤波器通带增益0 d B,-1 d B截止频率8 MHz,38 MHz处增益衰减达到-35 d B,带内波动0.5 d B,输入为1 MHz,400 m V Vpp时,THD为-57 d B,功耗7 m W.在特殊环境具有明显的优势。
基金supported in part by the National Key R&D Program of China(No.2018YFE0205900)in part by the Natural Science Foundation of Jiangsu Province of China(No.BK20180368)。
文摘The high linearity low-noise filter is an indispensable key circuit in the communication system.Based on the structure of current-reuse source-degradation operational transconductance amplifier(OTA),a 5 GHz current-mode low-noise Gm-C filter suitable for high-speed communication systems is proposed.Thanks to the proposed current mode structure and the OTA’s high-power efficiency and high linearity,the filter obtains good noise and high linearity performance with very low power consumption.The filter is designed in standard 65 nm CMOS technology and occupies a core area of 0.06 mm^(2).The simulation results show that the operating bandwidth is 5 GHz,the IIP3 is35 d Bm,and the power consumption is only 3.2 m W.
基金Supported by National High-tech R&D Program(863 Program)(2015AA042605)
文摘提出了一种改进的高线性度、宽调节范围的可调跨导运算放大器(OTA).其采用输入衰减和交叉耦合差分对两种线性化技术实现高线性度.此外采用源级退化电流镜结构对跨导值进行调节,实现了20倍的调节范围,同时保证了调节过程中维持相同的输入电压幅度.为了验证该OTA结构的有效性,设计了一个3阶低通滤波器.电路采用0.18μm SMIC CMOS工艺模型,仿结果显示,滤波器实现了从600 k Hz到10 MHz的线性调节,电流消耗为0.9-1 m A,其IIP3最高24.8 d Bm.
