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A Design of Lowpass Active Filter for ADLS Tx/Rx Stage  

Lee Geun-Ho (전주대학교 정보기술공학부)
Publication Information
The Journal of the Acoustical Society of Korea / v.24, no.1, 2005 , pp. 38-42 More about this Journal
Abstract
CMOS analog lowpass filters using speech signal bandwidth for a Asymmetrical Digital Subscriver Line(ADSL) modem are presented. Designed active lowpass filters are composed of the CMOS complementary high-swing cascode stage which can increase transconductance of an active element. As a result, their cutoff frequency are 138kHz and 1,100kHz respectively. A low-voltage high-swing cascode integrator which improved on a gain and unit gain frequency used to design the filters. The designed filters are verified by HSPICE simulation with the $0.251{\mu}m\;CMOS\;n-well$ Parameter and a single 2.5V power supply.
Keywords
ADSL Modem; Speech signal bandwidth; Continuous-time active filter;
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1 안인수 외 4인, 'Fully Differential CMOS 연산증폭기 설계', 대한전자공학회지 37 (6), 85-95, 2000
2 C. S. Yoo, and et all 'A ${\pm}1.5V$, 4-MHz CMOS Continuous-Time Filter with a Single-Integrator Based Tuning', IEEE J. Solid-State Circuits 33, 18-27, Jan. 1998   DOI   ScienceOn
3 이근호 외 3인, '3V CMOS Fully-Balanced 상보형 전류모드 적분기 설계', 한국음향학회지 16 (4), 106-113, 1997
4 C. H. Lin and M. Ismail, 'A 2V 5th-order Fully-Differential CMOS Gm-C Filter for Wide-band Communication', IEEE Proc. 136-139, 1999
5 C. Toumazou, F. J. Lidgey and D. G. Haigh, Analogue IC design : the Current- mode approach, IEEE Circuits and systems series 2, Peter Peregrinus Ltd., on behalf of the Institution of Electrical Engineering, (London, 1993), Chap. 11, 783-923
6 J. Sabadell, C. Aldea, S. Celma and P. A. Martinez, 'A Low Voltage High Frequency Integrator for CMOS Continuous-time Current-mode Filters', Proc. IEEE ISCAS Conf., 339-349, 1998
7 J. Y. Lee, and et all, 'A 3V linear input range tunable CMOS transconductor and its application to a 3.3V 1.1MHz Chebyshev low-pass Gm-C filter for ADSL', Proceedings of the IEEE 2000 Custom Integrated Circuits Conf., 387-390, 2000