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A 1.1 GHz Fifth Order Active-LC Butterworth Type
提出一种低功耗GHz宽带低通滤波器，采用LC谐振器，功耗效率提升7倍。
1.1 GHz带宽, 47 dB SNR, 48 dB IM3, 72 mW功耗
低功耗GHz宽带LC谐振器Butterworth滤波器共模反馈
▸创新点1：LC谐振器双二次型滤波器 - 提出了一种基于LC谐振器的双二次型滤波器架构，相比传统Gm-C滤波器，其功率效率提高了7倍以上，显著降低了功耗。
▸创新点2：共模反馈方案 - 设计了一种新型共模反馈电路，实现了高精度的共模控制，其环路带宽可超过滤波器带宽的两倍，确保了系统的稳定性。
▸创新点3：第五阶Butterworth滤波器 - 采用标准0.18μm CMOS工艺实现了第五阶Butterworth滤波器，带宽达到1.1 GHz，并具备0-23 dB可编程均衡增益，性能优越。
▸创新点4：低功耗GHz范围宽带低通滤波器 - 通过减少有源元件数量和优化电路设计，实现了低功耗GHz范围的宽带低通滤波器，适用于高效均衡功能实现。
Abstract
This paper describes architectural and design con- siderations for low power, GHz range wideband low-pass active filters. A series LC resonator based biquad is proposed and its power efficiency is shown to be over 7 times better than an equivalent Gm-C biquad. Reduced number of active elements and readily available bandpass and low-pass signals make this topology particularly suitable for efficient realization of equalizing functions. Also demonstrated is a common-mode feedback scheme that allows for a stable, high accuracy common-mode control with loop bandwidth which can exceed twice the filter’s bandwidth. A fifth order active-LC Butterworth filter prototype is fabricated in a standard 0.18 m CMOS technology. It provides a bandwidth of 1.1 GHz and features equalization gain programmable over a 0–23 dB range. It is experimentally verified to achieve 47 dB SNR and 48 dB IM3 with 250 mVpp swing while consuming 72 mW of power.