采用Cascode拓扑和RC反馈网络的高Q差分有源电感

A High Q Differential Active Inductor Employing Cascode Topology and RC Feedback Network

针对传统全差分有源电感在高频下品质因子Q较低的问题,联合使用Cascode拓扑和RC反馈网络对其进行优化。组合电路引入的双重负阻有效抵消了有源电感的寄生电阻,进而有效提高了高频下的Q值。基于Jazz 0.35μm SiGe BiCMOS工艺,利用射频仿真软件ADS完成电路设计与仿真。仿真结果表明,在联合采用了Cascode拓扑和RC反馈网络后,在频率大于1GHz时,有源电感的Q值明显提高;在1.3~3GHz频率范围内,Q值均大于20;在2.1GHz时,Q值达到最大值4 416,电感值变化范围为6.9~12nH。

To solve the problem of the low quality factor Q of the traditional fully differential active inductor（DAI）at high frequency,the combination of the cascode topology and the RC feedback network was employed to optimize the DAI.The two-fold negative resistance provided by the combination circuits had cancelled the parasitic positive resistance effectively,hence had increased Q at high frequency.Based on Jazz 0.35μm SiGe BiCMOS process,the novel DAI was designed and verified by ADS.The results indicated that the use of cascode topology and RC feedback network had improved obviously Qof DAI at the frequency more than 1GHz.In the frequency range from 1.3GHz to 3GHz,Qexceeded 20,and Qat maximum could reach 4 416 at 2.1GHz.The inductance varied from 6.9nH to 12 nH.