High‐tuning‐range CMOS band‐pass IF filter based on a low‐Q cascaded biquad optimization technique
High‐tuning‐range CMOS band‐pass IF filter based on a low‐Q cascaded biquad optimization technique
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基于低 Q 级联双二阶优化技术的高调谐范围 CMOS 带通 IF 滤波器
DOI：
10.1002/cta.2027
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发表时间：
2015
影响因子：
2.3
通讯作者：
A. Trifiletti
中科院分区：
文献类型：
--
作者：
P. Monsurrò;S. Pennisi;G. Scotti;A. Trifiletti
提出了一种基于低Q双二次单元级联的高阶连续时间中频带通滤波器的设计方法。该方法非常适合集成电路制造，因为它考虑了可用技术所规定的最大电容分布和对元件变化的最大可接受灵敏度。噪声和最大线性范围之间的权衡也得到了满足。还描述了一种新颖的宽调谐范围跨导体拓扑。基于这些结果，一个10极点带通滤波器的码分多址卫星接收机已被设计和测试。该滤波器提供10至70 MHz的可调中心频率（f0），并在f0 = 70 MHz附近呈现28 MHz带宽，在f0/2和2f 0处具有超过39 dB的衰减。对于1 Vpp 70 MHz输入，三阶谐波抑制高于60 dB，等效输出噪声低于1 mVrms。该电路采用0.25 µm互补金属氧化物半导体工艺制造，内核在2.5 V电源下功耗为12 mA，提供最佳电流/极比。模具面积为0.9 × 1.1 mm 2。版权所有© 2014约翰威利父子有限公司.
A design procedure for high‐order continuous‐time intermediate‐frequency band‐pass filters based on the cascade of low‐Q biquadratic cells is presented. The approach is well suited for integrated‐circuit fabrication, as it takes into account the maximum capacitance spread dictated by the available technology and maximum acceptable sensitivity to component variations. A trade‐off between noise and maximum linear range is also met. A novel, wide‐tuning‐range transconductor topology is also described. Based on these results, a 10‐pole band‐pass filter for a code division multiple‐access satellite receiver has been designed and tested. The filter provides tunable center frequency (f0) from 10 to 70 MHz and exhibits a 28‐MHz bandwidth around f0 = 70 MHz with more than 39‐dB attenuation at f0/2 and 2f0. Third‐order harmonic rejection is higher than 60 dB for a 1‐Vpp 70‐MHz input, and equivalent output noise is lower than 1 mVrms. The circuit is fabricated in a 0.25‐µm complementary metal oxide semiconductor process, and the core consumes 12 mA from a 2.5‐V supply, offering the best current/pole ratio figure. The die area resulted to be 0.9 × 1.1 mm2. Copyright © 2014 John Wiley & Sons, Ltd.