1V开关电容带通滤波器的设计  

1V switched-opamp bandpass SC filter

作　　者：蒋叶强[1] 熊元新[1] 司龙[1] 

机构地区：[1]武汉大学电气工程学院,湖北武汉430072

出　　处：《武汉大学学报（工学版）》2005年第3期119-121,125,共4页Engineering Journal of Wuhan University

基　　金：国家自然科学基金资助(编号:59977016).

摘　　要：设计完成了一基于开关运放(switchedopamp)技术的全差分开关电容(SC)带通滤波器.其电源电压为1V,采样频率为5MHz,品质因数为8,中心频率为833.33kHz.滤波器中的可关断运算放大器采用了新的共模反馈电路,降低了电路的复杂性;该设计采用了TSMC0.35μm工艺模型,仿真表明滤波器在低至0.9V的电压下仍能够正常工作.A full-differential SC filter based on switched-opamp approach is designed(supply voltage, (1 V); sampling frequency, 5 MHz; centre frequency, 833.33 kHz). A new CMFB circuit is designed which needs less devices and increases the sampling frequency. The circuit is designed and simulated in the TSMC 0.35 μm process .It is proved that the filter can work with a supply voltage as low as 0.9 V.

关 键 词：开关电容 低压 滤波器 开关运放 

分 类 号：TN432[电子电信—微电子学与固体电子学]