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基于g_m/I_D设计方法和电流复用型折叠共源共栅运算放大器结构,采用SMIC 0.18μm CMOS工艺,设计了一种应用于卫星接收机的低功耗可自动调谐双模式有源RC复数滤波器。引入了调零电阻,补偿由非理想运算放大器引起的Q值升高导致的通带纹波性能恶化。同时,引入了全集成调谐电路模块,补偿无源器件在IC制造中因工艺偏差导致的频率响应偏移。仿真结果表明:滤波器分别工作在GPS-L1和BD-B1模式,中心频率为4.092 MHz(带宽2 MHz)和6 MHz(带宽4MHz)时,镜像抑制比分别为65dB和61dB,增益分别为2dB和-1dB。滤波器芯片面积为0.6mm~2,在1.8V电源电压下,功耗仅为1.75mW。
Based on the g_m / I_D design method and current-multiplexed folded-cascode operational amplifier architecture, a low-power, self-tuning, dual-mode active RC complex filter for satellite receivers is designed using a SMIC 0.18μm CMOS process Device. A zero-resistance is introduced that compensates for the deterioration of the pass-band ripple caused by an increase in Q due to a non-ideal operational amplifier. At the same time, a fully integrated tuning circuit module is introduced to compensate for the frequency response offset of passive devices due to process variations in IC manufacturing. The simulation results show that the filter has 65dB and 61dB image rejection ratio and 2dB gain respectively when operating in GPS-L1 and BD-B1 mode respectively with the center frequency of 4.092 MHz (bandwidth of 2 MHz) and 6 MHz (bandwidth of 4 MHz) And -1dB. Filter chip area of 0.6mm ~ 2, 1.8V power supply voltage, power consumption is only 1.75mW.