The 12 MHz Switched Capacitor Low-Pass Filter Chip Design for WiMAX Applications

Jhin-Fang HUANG  Wen-Cheng LAI  Kun-Jie HUANG  Ron-Yi LIU  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E95-C   No.5   pp.972-975
Publication Date: 2012/05/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E95.C.972
Print ISSN: 0916-8516
Type of Manuscript: BRIEF PAPER
Category: Electronic Circuits
Keyword: 
SC ladder filter,  switched capacitor,  WiMAX,  

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Summary: 
In this paper, a fifth order curer low-pass filter using as switched-capacitor (SC) architecture is proposed and fabricated with TSMC 0.18 µm CMOS process. A fully differential SC is adopted via the bilinear transform of the corresponding analogue RLC passive prototype. To reach the largest possible input dynamic range and save chip area, the method of dynamic range scaling and minimum capacitor scaling is used. Measured results show that the proposed filter achieves a pass-band of 12.1 MHz with a sampling rate of 100 MHz, a SFDR of 50 dB, a stop-band attenuation greater than 50 dB and a power consumption of 48.5 mW at 1.8 V power supply. Including pads, the chip area occupies 1.515 (1.391.09) mm2. This paper has the feature of low noise, excellent linearity of the filter, and high stability. The experimental results show that it has perfect performance for WiMAX applications and standard is recommended.