High frequency Tow-Thomas tunable filter using OTA based voltage op-amp

Author

Zemouri, Walid ; Soliman, Eman A. ; Mahmoud, Soliman A.

Author_Institution

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

fYear

2011

fDate

12-14 Dec. 2011

Firstpage

484

Lastpage

487

Abstract

A high frequency Tow-Thomas filter with tunable cutoff frequency is introduced in this paper. The filter is realized using operational trans-conductance amplifier (OTA) based voltage op-amp, resistor arrays and constant capacitors. The OTA used is digitally tuned to realize a voltage op-amp with tunable unity gain frequency from 3GHz to 35.48GHz. The Tow-Thomas filter´s cutoff frequency is tuned using a digitally programmable resistor array. The filter is simulated two times, one for the band-pass response and another for the low-pass response with the filter´s cutoff frequency tuned from 16.6MHz to 120.2MHz and from 52MHz to 501MHz respectively. The filter is realized using IBM 90nm CMOS technology model from MOSIS under 1V supply. The filter is simulated using LTSPICE.

Keywords

CMOS analogue integrated circuits; microwave filters; operational amplifiers; CMOS technology model; LTSPICE; MOSIS; OTA; band-pass response; constant capacitors; digital programmable resistor array; frequency 16.6 MHz to 120 MHz; frequency 3 GHz to 35.48 GHz; frequency 52 MHz to 501 MHz; high frequency Tow-Thomas tunable filter; low-pass response; operational trans-conductance amplifier; resistor arrays; size 90 nm; voltage op-amp; Band pass filters; Cutoff frequency; Differential amplifiers; Gain; Low pass filters; Optical filters; Resistors; Constant Capacitance Scaling; Feed-forward Compensation; Operational Trans-conductance Amplifier; Tow-Thomas filter; voltage op-amp;

fLanguage

English

Publisher

ieee

Conference_Titel

Integrated Circuits (ISIC), 2011 13th International Symposium on

Conference_Location

Singapore

Print_ISBN

978-1-61284-863-1

Type

conf

DOI

10.1109/ISICir.2011.6132002

Filename

6132002