Browse > Article
http://dx.doi.org/10.4313/JKEM.2010.23.4.267

A Gm-C Filter using CMFF CMOS Inverter-type OTA  

Choi, Moon-Ho (페어차일드코리아)
Kim, Yeong-Seuk (충북대학교 반도체공학과)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.23, no.4, 2010 , pp. 267-272 More about this Journal
Abstract
In this paper, a Gm-C LPF utilizing common-mode feedforward (CMFF) CMOS inverter type operational transconductance amplifier (OTA) has been designed and verified by circuit simulations. The CMFF CMOS inverter OTA was optimized for wide input linearity and low current consumption using a standard 0.18 ${\mu}m$ CMOS process; gm of 100 ${\mu}S$ and current of 100 ${\mu}A$ at supplied voltage of 1.3 V. Using this optimized CMFF CMOS inverter type OTA, an elliptic 5th order Gm-C LPF for GPS specifications was designed. Gain and frequency tuning of the LPF was done by changing the internal supply voltages. The designed Gm-C LPF gave pass-band ripple of 1.6 dB, stop-band attenuation of 60.8 dB, current consumption of 0.60 mA at supply voltage of 1.2 V. The gain and frequency characteristics of designed Gm-C LPF was unchanged even though the input common-mode voltage is varied.
Keywords
CMFF; CMOS; OTA; Gm-C; LPF;
Citations & Related Records
연도 인용수 순위
  • Reference
1 L. Acosta, M. Jimenez, R. G. Carvajal, A. J. Lopez-Martin, and J. Ramirez-Angulo, "Highly linear tunable CMOS Gm-C low-pass filter", IEEE Trans. Circuits and Systems-I, Vol. 56, p. 2145, 2009.   DOI
2 T. Sanchez-Rodriguez, C. I. Lujan-Martinez, R. G. Carvajal, J. Ramirez-Angulo, and A. Lopez-Martin, "CMOS linear programmable transconductor suitable for adjustable Gm-C filters", Electronics Lett., Vol. 44, p. 505, 2008.   DOI
3 G. Zhiqiang, W. Jinxiang, L. Fengchang, Y. Mingyan, and Z. Zhongzhao, "Wideband reconfigurable CMOS Gm-C filter for wireless applications", IEEE Int. Conf. on Electronics, Circuits, and Systems, p. 179, 2009.
4 최문호, 다중 표준 수신기를 위한 아날로그 베이스 밴드 설계, 충북대학교 박사학위논문, 2009.
5 B. Nauta and E. Seevinck, "Linear CMOS transconductance element for VHF filters", Electron. Lett., Vol. 25, p. 448, 1989.   DOI
6 B. Nauta, "A CMOS transconductance-C filter technique for very high frequencies", J. of Solid-State Circuits, Vol. 27, p. 142, 1992.   DOI
7 R. Schaumann and M. E. Van Valkenburg, "Design of analog filters", Oxford University Press, 2001.
8 박송배, 애널로그 IC 필터의 설계, 홍릉과학출판사, 1999.