This paper deals with the realization of two first-order all-pass filter (APF) structures. First structure provides both inverting and non-inverting voltage-mode APF functions. This structure utilizes one differential difference dual-X second generation current conveyor (DD-DXCCII) without Z terminals, one active resistor and one capacitor only. The use of active resistor makes the proposed structure electronically tunable. Therefore, the attributes such as use of single DD-DXCCII without Z terminals and electronic tunability make the proposed structure simple and attractive. Conversely, second proposed circuit structure of first-order APF enriches the quality of this paper as both inverting and non-inverting APF functions in both voltage and current forms are available simultaneously within the same circuit structure. This circuit is realized with the help of one DD-DXCCII, three active resistors and one capacitor. The second circuit structure also enjoys gain controllability feature along with electronically tunable pole frequency that proves to be very essential in many of the applications. Additionally, the proposed APF structures provide the demanding feature of cascadability along with chip fabrication support. Furthermore, the performance of proposed circuits is less affected by the non-idealities and parasitic of DD-DXCCII. PSPICE simulations are provided to validate the theoretical presumptions.

中文翻译：

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新型 CMOS 可实现全通频率选择结构

本文讨论了两个一阶全通滤波器（APF）结构的实现。第一种结构提供反相和非反相电压模式 APF 功能。这种结构利用一个差分差分双X第二代电流输送器 (DD-DXCCII) 无Z端子，只有一个有源电阻和一个电容器。有源电阻器的使用使所提出的结构电子可调。因此，使用单个 DD-DXCCII 等属性没有Z终端和电子可调性使所提出的结构简单而有吸引力。相反，第二次提出的一阶 APF 电路结构丰富了本文的质量，因为电压和电流形式的反相和非反相 APF 功能在同一电路结构中同时可用。该电路由一个DD-DXCCII、三个有源电阻和一个电容实现。第二种电路结构还具有增益可控性以及电子可调谐极点频率，这在许多应用中被证明是非常重要的。此外，所提出的 APF 结构提供了要求的级联特性以及芯片制造支持。此外，所提出电路的性能受 DD-DXCCII 的非理想性和寄生效应的影响较小。