A ±1.5-V, 4-MHz CMOS continuous-time filter with a single-integrator based tuning

Author

Yoo, Changsik ; Lee, Seung-Wook ; Kim, Wonchan

Author_Institution

Lab. of Integrated Syst., Seoul Nat. Univ., South Korea

Volume

33

Issue

1

fYear

1998

fDate

1/1/1998 12:00:00 AM

Firstpage

18

Lastpage

27

Abstract

A 4-MHz, fifth-order elliptic low-pass Gm-C filter is described whose characteristics are tuned by an on-chip automatic tuning circuit. The tuning circuit uses only one integrator as the master of tuning instead of problematic voltage controlled oscillator (VCO) and voltage controlled filter (VCF). MOS transistors in linear operation region perform the voltage-to-current conversion in an operational transconductance amplifier, and thereby we achieved ±1.5 V operation. A prototype filter was implemented in a 0.8-μm double-poly, double-metal CMOS process. The filter exhibits the dynamic range of 57.6 dB and dissipates 10 mW with ±1.5-V supply. The stopband attenuation is better than 45.0 dB and the passband ripple is smaller than 1.0 dB

Keywords

CMOS analogue integrated circuits; circuit tuning; continuous time filters; elliptic filters; integrating circuits; low-pass filters; operational amplifiers; 0.8 micron; 1.5 V; 10 mW; 4 MHz; CMOS continuous-time filter; MOS transistor; double-poly double-metal CMOS process; dynamic range; fifth-order elliptic low-pass Gm-C filter; linear operation; on-chip automatic tuning circuit; operational transconductance amplifier; passband ripple; power dissipation; single integrator; stopband attenuation; voltage-to-current conversion; CMOS process; Circuit optimization; Low pass filters; MOSFETs; Operational amplifiers; Prototypes; Transconductance; Tuned circuits; Voltage control; Voltage-controlled oscillators;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/4.654933

Filename

654933