Gm-C复合过渡滤波器低中频无线局域网应用

Proceedings of the 12th IEEE International Conference on Fuzzy Systems (Cat. No.03CH37442) Pub Date : 1900-01-01 DOI:10.1109/ICM.2003.238424

T. Teo, E. Khoo, D. Uday

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引用次数: 7

摘要

介绍了一种用于低中频WLAN的gm-C复合滤波器的设计与实现。实现了五阶过渡复贝塞尔-切比雪夫滤波器，兼顾了高衰减和低群延迟变化。电路采用0.18 /spl μ m CMOS工艺制作。测量结果表明，该滤波器具有30 ~ 40 dB的图像抑制和18 dB的相邻通道抑制，同时在通频带内保持低于6.0ns的低群延迟变化。高频宽频带滤波器对电路的设计也有严格的要求。差分逆变器的晶体管是优化这种gm-C连续时间滤波器设计。包括片上调谐电路和带隙在内的完整滤波器在1.8 V单电源电压下仅消耗7.5 mA。

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Gm-C complex transitional filter for low-IF wireless LAN application

The design and implementation of a gm-C complex filter for low-IF WLAN is described. Fifth-order transitional complex Bessel-Chebyshev filter is implemented to compromise between high attenuation and low group-delay variation. The circuit is fabricated using 0.18 /spl mu/m CMOS process. Measured results show that the filter provides 30 dB to 40 dB image rejection and 18 dB adjacent channel rejection, while keeping a low group-delay variation of below 6.0ns within the pass-band. High frequency and wide bandwidth filter also requires stringent design specification of the circuitries. Differential inverter transconductor is optimized for this gm-C continuous-time filter design. The complete filter including on-chip tuning circuit and bandgap consumes only 7.5 mA with 1.8 V single supply voltage.

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Proceedings of the 12th IEEE International Conference on Fuzzy Systems (Cat. No.03CH37442)

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