为了得到单个VDTA浮地回转器,首先给出了VDTA的16个奇异模型,再根据节点导纳矩阵扩展法,系统综合了基于电压差分跨导放大器(VDTA)的浮地回转器,该回转器使用1个VDTA和一个接地电容,而且容易集成。通过调节的VDTA偏置电流,电路的参数能...为了得到单个VDTA浮地回转器,首先给出了VDTA的16个奇异模型,再根据节点导纳矩阵扩展法,系统综合了基于电压差分跨导放大器(VDTA)的浮地回转器,该回转器使用1个VDTA和一个接地电容,而且容易集成。通过调节的VDTA偏置电流,电路的参数能电控调节。最后,为了证实导出电路的可实现性,利用回转器构造了一个二阶通用滤波器,其极点频率fo=159 k Hz,品质因数Q=1。MULTISIM仿真结果与理论一致。展开更多
基于实现电压差分跨导放大器(VDTA)的接地回转器目的,采用节点导纳矩阵扩展法(括号符号法),系统综合了2个基于VDTA接地回转器。所综合的电路仅仅使用一个VDTA,通过调节VDTA的偏置电流,电路的参数能电控调节。为证实电路工作的可靠性,基...基于实现电压差分跨导放大器(VDTA)的接地回转器目的,采用节点导纳矩阵扩展法(括号符号法),系统综合了2个基于VDTA接地回转器。所综合的电路仅仅使用一个VDTA,通过调节VDTA的偏置电流,电路的参数能电控调节。为证实电路工作的可靠性,基于该回转器之一,利用元件替换法,设计了电流模式三阶巴特沃斯高通滤波器,其极点频率为100 k Hz,通带增益为0.5,结合计算机仿真结果,得出所设计的电路正确有效。展开更多
A new polarization rotator based on the silica photonic crystal fiber is proposed. The proposed polarization rotator photonic crystal fiber （PR-PCF） possesses a triangle jigsaw-shape core region. The full-vector fin...A new polarization rotator based on the silica photonic crystal fiber is proposed. The proposed polarization rotator photonic crystal fiber （PR-PCF） possesses a triangle jigsaw-shape core region. The full-vector finite-element method is used to analyze the phenomenon of polarization conversion between the quasi-TE and quasi-TM modes. Numerical simulations show that the wavelengths of 1.31 μm and 1.55 μm are converted with a nearly 100% polarization conversion ratio with their matched coupling length and has a relatively strong realistic fabrication tolerance - 100 nm on the y axis and 50 nm on the x axis. The full vectorial finite difference beam propagation method is used to confirm the performance of the proposed PR-PCF.展开更多
文摘为了得到单个VDTA浮地回转器,首先给出了VDTA的16个奇异模型,再根据节点导纳矩阵扩展法,系统综合了基于电压差分跨导放大器(VDTA)的浮地回转器,该回转器使用1个VDTA和一个接地电容,而且容易集成。通过调节的VDTA偏置电流,电路的参数能电控调节。最后,为了证实导出电路的可实现性,利用回转器构造了一个二阶通用滤波器,其极点频率fo=159 k Hz,品质因数Q=1。MULTISIM仿真结果与理论一致。
文摘基于实现电压差分跨导放大器(VDTA)的接地回转器目的,采用节点导纳矩阵扩展法(括号符号法),系统综合了2个基于VDTA接地回转器。所综合的电路仅仅使用一个VDTA,通过调节VDTA的偏置电流,电路的参数能电控调节。为证实电路工作的可靠性,基于该回转器之一,利用元件替换法,设计了电流模式三阶巴特沃斯高通滤波器,其极点频率为100 k Hz,通带增益为0.5,结合计算机仿真结果,得出所设计的电路正确有效。
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11274181,10974100,61203204,and 10674075)the Doctoral Scientific Fund Project of the Ministry of Education of China(Grant No.20120031110033)the Tianjin Key Program of Application Foundations and Future Technology Research Project,China(Grant No.10JCZDJC24300)
文摘A new polarization rotator based on the silica photonic crystal fiber is proposed. The proposed polarization rotator photonic crystal fiber （PR-PCF） possesses a triangle jigsaw-shape core region. The full-vector finite-element method is used to analyze the phenomenon of polarization conversion between the quasi-TE and quasi-TM modes. Numerical simulations show that the wavelengths of 1.31 μm and 1.55 μm are converted with a nearly 100% polarization conversion ratio with their matched coupling length and has a relatively strong realistic fabrication tolerance - 100 nm on the y axis and 50 nm on the x axis. The full vectorial finite difference beam propagation method is used to confirm the performance of the proposed PR-PCF.
