一款应用于多频带的基于新型Cascode有源电感的高Q带通滤波器

设计了一款基于新型Cascode有源电感和有源负阻电路的二阶差分有源带通滤波器。新型有源电感和有源负阻电路的采用可实现在滤波器Q值不变的条件下对滤波器的中心频率进行调节。仿真结果表明，通过调节有源电感和有源负阻电路的偏置条件，可有效增大滤波器的Q值，且在保持Q值恒定在226的条件下中心频率的变化范围为0.2-3.7GHz。滤波器的以上特性使其能很好地应用于多频带的无线系统。

A High Quality-Factor Bandpass Filter Based on Novel Cascode Active Inductor for Multi-Band Applications

A second-order differential active bandpass filter based on a novel Cascode active inductor and an active negative resistance topology is proposed. The Q-factor and the center frequency of the filter can be tuned independently by changing the bias conditions of the active inductor and the active negative resistance circuit. The results demonstrate that the Q-factor can be enlarged effectively by changing the bias conditions of the active inductor and the active negative resistance circuit; the tuning range of center frequency of the proposed filter is from 0.2GHz to 3.7GHz under the condition of constant Q-factor of 226. All the features mentioned above can satisfy the circuit design requirements for multi-band wireless system.