论文部分内容阅读
研制了一款可编程6阶巴特沃斯有源RC滤波器。为提高滤波器中运算放大器的增益带宽积,设计了一种新型的前馈补偿运算放大器。为消除工艺偏差和环境变化对截止频率的影响,设计了一种片上数字控制频率调谐电路,并采用TSMC 0.18μm CMOS工艺进行了流片。滤波器采用低通滤波结构,测试结果表明,3 d B截止频率为1 32 MHz,步进1 MHz,带内增益0 d B,带内纹波0.8 d B,2倍带宽处带外抑制不小于24 d Bc,5倍带宽处带外抑制不小于68 d Bc,滤波器等效输入噪声为槡340 n V/Hz@1 MHz,调谐误差为±3%。滤波器裸芯片面积0.87 mm×1.05 mm。采用1.8 V电源电压,滤波器整体功耗小于20 m W。
Developed a programmable 6th order Butterworth active RC filter. In order to improve the gain-bandwidth product of the operational amplifier in the filter, a novel feedforward compensation operational amplifier is designed. In order to eliminate the influence of process deviation and environmental change on the cut-off frequency, an on-chip digital control frequency tuning circuit is designed and the TSMC 0.18μm CMOS process is used to slice. The filter uses a low-pass filter structure and results show that the 3-dB B cut-off frequency is 1 32 MHz, the step is 1 MHz, the in-band gain is 0 dB, the in-band ripple is 0.8 dB, and the out-of- The out-of-band rejection at 5x bandwidth is less than 68 d Bc for less than 24 d Bc and the equivalent input noise is 槡 340 n V / Hz @ 1 MHz with a tuning error of ± 3%. Filter bare chip area 0.87 mm × 1.05 mm. With a 1.8 V supply voltage, the overall power consumption of the filter is less than 20 mW.