CMOS switched-current biquadratic filters

Author

Fiez, Terri S. ; Lee, Bor ; Allstot, David J.

Author_Institution

Dept. of Electr. & Comput. Eng., Oregon State Univ., Corvallis, OR, USA

fYear

1990

fDate

1-3 May 1990

Firstpage

2300

Abstract

It is shown how the technique of switched currents (SI) can be used to realize the universal biquadratic transfer function. SI filters require only a standard digital CMOS process, and the power-supply voltage requirement is very low. SI circuits also can be potentially operated at much higher frequencies than switched-capacitor (SC) filters due to the low-impedance nodes of the current mirrors. A simple method to design SI biquadratic filters with maximum dynamic range that leverages the well-established design methodology of SC biquadratic filters has been developed. The methods are demonstrated by designing integrated biquadratic versions of the low-pass, high-pass, and bandpass biquadratic SI filters in a 2-μm n-well CMOS technology

Keywords

CMOS integrated circuits; active filters; band-pass filters; high-pass filters; linear integrated circuits; low-pass filters; network synthesis; switched filters; 2 micron; bandpass; current mirrors; design methodology; high-pass; integrated biquadratic versions; low-impedance nodes; low-pass; monolithic IC; n-well CMOS technology; power-supply voltage requirement; standard digital CMOS process; switched-current biquadratic filters; universal biquadratic transfer function; Band pass filters; CMOS process; CMOS technology; Design methodology; Digital filters; Frequency; Mirrors; Switching circuits; Transfer functions; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1990., IEEE International Symposium on

Conference_Location

New Orleans, LA

Type

conf

DOI

10.1109/ISCAS.1990.112469

Filename

112469