基于OTA-C的多功能全集成电流模式双2阶滤波器

Multi-Function Fully-Integrated Current-Mode Biquad Filter Based on OTA-C

采用TSMC 0.18μm CMOS工艺,设计了一种基于OTA的单输入多输出的多功能电流模式双2阶滤波器。滤波器的5个输出端口可同时得到低通、高通、带通、带阻和全通5种滤波功能。该电路结构简单,仅需要4个MO-OTA和2个电容;电路固有角频率ω0及品质因数Q值独立可调;灵敏度低,均小于或等于0.5。基于BSIM3模型参数,采用Hspice仿真工具对电路进行了仿真,结果表明滤波器性能良好,版图符合设计要求。

A multi-function current-triode biquad filter based on OTA-C was designed in TSMC 0.18 Vm CMOS process. The filters had one input and five outputs. This filter could realize five kinds of filter function, such as low- pass, high-pass, band-pass, band-stop and all-pass by selecting the corresponding output. The circuit＇s structure was simple, and consisted of only four OTAs and two capacitances. The circuit could adjust separately the intrinsic angular frequency and the quality factor, and had low passive sensitivities （less than or equal to 0.5）. The circuit was simulated based on BSIM3 model with Hspice. The results showed that the filter had nice performance, and its layout met the design requirements.