Title :
Design of a digitally tunable 5th order GM-C filter using linearized OTA in 90nm CMOS technology
Author :
Sarrafinazhad, Ata ; Kara, Ismail ; Baskaya, Faik
Author_Institution :
Dept. of Electr. & Electron. Eng., Bogazici Univ., Istanbul, Turkey
Abstract :
In this paper we present an analog 5th order GM-S low-pass filter structure using ten identical operational transconductance amplifiers (OTA) for high speed wireless systems. A linear OTA that can be tuned by a single bias current, which is provided by a 5-bit current DAC, was designed. The 3dB cut-off frequency of the filter can be tuned from 6 MHz to 40 MHz. IM3 of the 40 MHz 5th order low-pass filter is -60 dB with 400 mV p-p input voltage, 1.2 V supply voltage, and approximately 8.4 mW power consumption. Layout of the proposed filter occupies 0.07 mm2 IC area in 90nm single-poly 9 metal layer CMOS technology. Post-layout simulation waveforms are obtained using Eldo simulation environment of MentorGraphics tool suit.
Keywords :
CMOS integrated circuits; circuit tuning; digital-analogue conversion; low-pass filters; operational amplifiers; CMOS technology; Eldo simulation environment; MentorGraphics tool suit; complementary metal oxide semiconductor; current DAC; cut-off frequency; digital tuning; digital-analog converter; fifth order GM-C filter; frequency 6 MHz to 40 MHz; linearized OTA; low-pass filter; operational transconductance amplifier; single bias current; size 90 nm; voltage 1.2 V; voltage 400 mV; wireless system; word length 5 bit; Gain; Layout; Linearity; Resistors; Transconductance; Transistors; Wireless communication;
Conference_Titel :
Signals, Circuits and Systems (ISSCS), 2015 International Symposium on
Conference_Location :
Iasi
Print_ISBN :
978-1-4673-7487-3
DOI :
10.1109/ISSCS.2015.7203925
