基于电压模式OA-OTA多功能滤波器设计

提出了一种仅用有源器件 OA(运算放大器)和 OTA(跨导运算放大器)设计的电压模式二阶多功能滤波器电路,通过选择不同的输入输出端,可以实现低通、带通、高通、带阻及全通等五种滤波器功能.调节两个 OTA 的跨导增益来调节电路的中心频率和品质因数.该电路仅含两个 OA 和两个 OTA,不含任何无源器件,相比同类电路,该电路具有结构简单,便于集成的优点.PISPICE 仿真结果表明,提出的电路方案是可行的.

Design of a Versatile Voltage-Mode Filter Based on OA and OTA

A new two-order voltage-mode filter which only uses active devices such as Operational Amplifiers(OAs)and Operational Transconductance Amplifiers(OTAs)is introduced.The proposed filter can realize five transfer functions,such as LP,HP,BP,BS and AP,by choosing the different input and output terminals.Also the circuit characteristics,including center frequency and quality factor,can be electronically tuned by adjusting the transconductance gains of the OTAs.It only uses two OAs and two OTAs in this filter.Its structure is simple but the functions are versatile and the proposed filter is easy to be integrated.Results from PSPICE show that this design is feasible.