Design of current-mode gm-C MLF elliptic filters for wireless receivers

Author

Zhu, Xi ; Sun, Yichuang ; Moritz, James

Author_Institution

Sch. of EC&EE, Univ. of Hertfordshire, Hatfield

fYear

2008

fDate

Aug. 31 2008-Sept. 3 2008

Firstpage

296

Lastpage

299

Abstract

Two CMOS fifth-order gm-C elliptic lowpass filters based on the current-mode multiple loop feedback (MLF) leap-frog (LF) and follow-the-leader-feedback (FLF) configurations are designed. The filters are implemented using a fully-differential linear operational transconductance amplifier (OTA). PSpice simulations using a standard TSMC 0.18mum CMOS process with 1.8V power supply have shown that the cut-off frequency of both filters can be tuned from 28MHz to 44MHz, dynamic range is about 67dB and 62dB for the LF and FLF filters respectively, and power consumption is about 67mW at 30MHz for both filters. Less than 0.5dB passband ripple is achieved for both filters; 65dB and 50dB stopband attenuations are obtained for MLF LF and FLF configurations, respectively.

Keywords

continuous time filters; elliptic filters; receivers; PSpice simulation; current-mode multiple loop feedback leap-frog; elliptic filters; elliptic lowpass filters; follow-the-leader-feedback configurations; frequency 28 MHz to 44 MHz; frequency 30 MHz; fully-differential linear operational transconductance amplifier; passband ripple; size 0.18 mum; stopband attenuations; voltage 1.8 V; wireless receivers; CMOS process; Cutoff frequency; Dynamic range; Energy consumption; Feedback loop; Nonlinear filters; Operational amplifiers; Power filters; Power supplies; Transconductance;

fLanguage

English

Publisher

ieee

Conference_Titel

Electronics, Circuits and Systems, 2008. ICECS 2008. 15th IEEE International Conference on

Conference_Location

St. Julien´s

Print_ISBN

978-1-4244-2181-7

Electronic_ISBN

978-1-4244-2182-4

Type

conf

DOI

10.1109/ICECS.2008.4674849

Filename

4674849