论文信息 - A low-power CMOS Gm-C filter for wireless receiver applications with on-chip automatic tuning system

A low-power CMOS Gm-C filter for wireless receiver applications with on-chip automatic tuning system

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

Armin Tajalli | Reza Lotfi | Saeid Mehrmanesh | H. Adrang | K. Mafinejhad

[1] Francois Krummenacher,et al. A 4-MHz CMOS Continuous-Time Filter with On-Chip Automatic Tuning , 1987, ESSCIRC '87: 13th European Solid-State Circuits Conference.

[2] I. Mehr,et al. A CMOS Continuous-Time Filter for PRML Read Channel Applications at 150 Mb/s and Beyond , 1997 .

[3] I. Mehr,et al. A CMOS continuous-time G/sub m/-C filter for PRML read channel applications at 150 Mb/s and beyond , 1997 .

[4] W. Guggenbuhl,et al. A voltage-controllable linear MOS transconductor using bias offset technique , 1990 .

[5] Ashok Nedungadi,et al. Design of linear CMOS transconductance elements , 1984 .

[6] Andrea Baschirotto,et al. Tunable BiCMOS continuous-time filter for high-frequency applications , 1992 .

[7] F. Krummenacher. Design considerations in high-frequency CMOS transconductance amplifier capacitor (TAC) filters , 1989, IEEE International Symposium on Circuits and Systems,.

[8] Kyoung-Rok Cho,et al. A novel CMOS operational transconductance amplifier based on a mobility compensation technique , 2005, IEEE Trans. Circuits Syst. II Express Briefs.

[9] E. Seevinck,et al. A versatile CMOS linear transconductor/square-law function , 1987 .

[10] José Miguel Rocha-Pérez,et al. A 60-mW 200-MHz continuous-time seventh-order linear phase filter with on-chip automatic tuning system , 2003 .

[11] H.J. De Man,et al. Adaptive biasing CMOS amplifiers , 1982, IEEE Journal of Solid-State Circuits.