Sixth order baseband variable LPF using new tunable operational amplifier

Author

Fahmy, Said M. ; Soliman, Eman A. ; Mahmoud, Soliman A.

Author_Institution

Electr. & Electron. Eng. Dept., German Univ. in Cairo, Cairo, Egypt

fYear

2009

fDate

19-22 Dec. 2009

Firstpage

34

Lastpage

37

Abstract

A sixth order reconfigurable low pass filter (LPF) is realized in this paper using 0.25 Â¿m CMOS technology model. The filter is based on cascading connection of bi-quadratic Active-G_m-RC cells. The Active-G_m cells are realized using compensated op-amps with variable transconductance gain and variable compensation capacitors (Variable G_m-C_c op-amp). The tuning range of the filter´s cutoff frequency is from 77.4 KHz to 37.78MHz. The filter operates from single supply of 1.7V. Simulations results using PSPICE for the proposed reconfigurable LPF are presented. Comparisons with previous work in are included to view the points of strength for the proposed architecture.

Keywords

CMOS integrated circuits; low-pass filters; operational amplifiers; CMOS technology; PSPICE; bi-quadratic Active-Gm-RC cells; cascading connection; frequency 77.4 kHz to 37.78 MHz; low pass filter; sixth order baseband variable LPF; tunable operational amplifier; voltage 1.7 V; Baseband; CMOS technology; Capacitors; Cutoff frequency; Gain; Low pass filters; Operational amplifiers; Semiconductor device modeling; Transconductance; Tuning; Flexible op-amp (FLOA); Gain bandwidth product (GBW); Software defined radio (SDR); unity gain frequency (ωu);

fLanguage

English

Publisher

ieee

Conference_Titel

Microelectronics (ICM), 2009 International Conference on

Conference_Location

Marrakech

Print_ISBN

978-1-4244-5814-1

Type

conf

DOI

10.1109/ICM.2009.5418611

Filename

5418611