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本文采用0.18um CMOS工艺设计并实现了一个应用于无线传感器网络的带有片上自动调谐功能的Gm-C复数滤波器。该滤波器基于一个五阶切比雪夫低通RLC原型,由电容和差分跨导综合而成。为了实现滤波器中心频率和带宽的精确控制,采用了一个传统锁相环电路来实现片上自动调谐的功能。该滤波器的中心频率为2MHz,带宽2.4MHz。电路的测试结果表明:在1.8V电源电压下,自动调谐电路工作正常,滤波器具有较为精确的中心频率和带宽,实现了超过45dB的镜像抑制,同时带内抖动小于1.2dB。包括片上自动调谐电路在内的整个滤波器电路共有4.9mA的电流消耗。 相似文献
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A G_m-C complex filter with on-chip automatic tuning for wireless sensor networks is designed and implemented using 0.18μm CMOS process.This filter is synthesized from a low-pass 5th-order Chebyshev RLC ladder filter prototype by means of capacitors and fully balanced transconductors.A conventional phase-locked loop is used to realize the on-chip automatic tuning for both center frequency and bandwidth control.The filter is centered at 2 MHz with a bandwidth of 2.4 MHz.The measured results show that the filter provides more than 45 dB image rejection while the ripple in the pass-band is less than 1.2 dB.The complete filter including on-chip tuning circuit consumes 4.9 mA with 1.8 V single supply voltage. 相似文献
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