Title :
A low-power CMOS Gm-C filter for wireless receiver applications with on-chip automatic tuning system
Author :
Adrang, Habib ; Lotfi, Reza ; Mafinejhad, Khalil ; Tajalli, Armin ; Mehrmanesh, Saeed
Author_Institution :
Dept. of EE, Ferdowsi Univ. of Mashhad
Abstract :
In this paper, a fourth-order, 3.5-MHz, low-pass elliptic Gm-C filter employing low-noise, low-voltage transconductance amplifiers is presented. A new technique to enhance the linearity of the Gm-C filter is proposed. Furthermore, the nonlinear behavior of the filter caused by nonlinear behavior of transconductors with determined input amplitude is discussed. HSpice simulation results of the 1.8-V filter in a 0.18 mum CMOS process show a THD of less than -44dB for 0.6Vpp input signal and an input-referred noise of less than 45 nV/radicHz in worst case. The current consumption of each OTA is 1.5-mA
Keywords :
CMOS integrated circuits; elliptic filters; harmonic distortion; low-pass filters; low-power electronics; nonlinear filters; nonlinear network analysis; operational amplifiers; radio receivers; 0.18 micron; 0.6 V; 1.5 mA; 1.8 V; 3.5 MHz; CMOS process; HSpice simulation; OTA; THD; current consumption; fourth-order filter; input amplitude; input-referred noise; low-pass elliptic filter; low-power CMOS Gm-C filter; nonlinear behavior; on-chip automatic tuning system; transconductance amplifiers; wireless receiver; Feedback circuits; Filters; Frequency; Linearity; Low voltage; Sampling methods; System-on-a-chip; Transconductance; Transconductors; Tuning;
Conference_Titel :
Circuits and Systems, 2006. ISCAS 2006. Proceedings. 2006 IEEE International Symposium on
Conference_Location :
Island of Kos
Print_ISBN :
0-7803-9389-9
DOI :
10.1109/ISCAS.2006.1693458
