摘要
设计并实现了一种基于Gm-C二次节(Biquad)结构的6阶切比雪夫Ⅰ型模拟中频带通滤波器,中心频率为46MHz,带宽为2.046MHz.其中Biquad结构中加入了负阻抗单元,增加输出阻抗,实现滤波器的高Q值(品质因数).跨导放大器(Operational transconductance amplifier,OTA)单元使用源极负反馈技术,优化了OTA的线性性能.整个滤波器电路采用0.35μm CMOS工艺实现.经过仿真验证,滤波器的通带纹波是2.704dB,1.5倍带宽处衰减大于21dB.在3.3V电源电压情况下,滤波器的总电流消耗为8.87mA.
A 46 MHz centre frequency, 2. 046 MHz bandwidth 6th order Chebyshe--v-I bandpass integrated filter using a biquad Gm-C structure is designed and implemented. Negative resistance cells are used in the biquad structure to obtain high Q of the filter. The OTA has a high linearity with source degeneration technique using MOS resistors. The whole filter circuit is designed and simulated in 0.35 t^m CMOS process. The pass-band ripple of the filter is 2. 704 dB and the 1.5 bandwidth attenuation is higher than 21 dB. The total de current consumption is 8.87 mA @ 3.3 V supply.
出处
《微电子学与计算机》
CSCD
北大核心
2012年第8期74-77,共4页
Microelectronics & Computer
