A low-distortion 22 kHz 5th-order Bessel filter

Author

Moon, U.-K. ; Song, B.-S.

Author_Institution

Illinois Univ., Urbana, IL, USA

fYear

1993

Firstpage

110

Lastpage

111

Abstract

A low-distortion MOSFET-C filter design is proposed. The proposed technique relies on the linearity of the passive resistors and the tunability of current-steering MOS transistors operating in the triode region. Placing the nonlinear elements inside the feedback loops and degenerating the MOSFETs by passive resistors, greatly reduces the distortion resulting from the nonlinear devices. A prototype 22-kHz Bessel filter automatically tuned to a switched-capacitor reference resistor has control voltage feedthrough below -100 dB, and measured linearity better than -90-dB THD (total harmonic distortion), with a 2-kHz, 4-V/sub pp/ voltage swing. Measured THD demonstrates an improvement of at least 30 dB over a conventional MOSFETC filter. The chip consumes 40 mW with a 5-V supply, and the active die area is 7 mm/sup 2/ in 2- mu m double-poly CMOS.<>

Keywords

CMOS integrated circuits; active filters; switched capacitor filters; 2 micron; 22 kHz; 40 mW; 5 V; active die area; control voltage feedthrough; current-steering MOS transistors; double-poly CMOS; feedback loops; linearity; low-distortion MOSFET-C filter design; passive resistors; switched-capacitor reference resistor; total harmonic distortion; triode region; tunability; Automatic voltage control; Distortion measurement; Feedback loop; Filters; Linearity; MOSFET circuits; Prototypes; Resistors; Semiconductor device measurement; Total harmonic distortion;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State Circuits Conference, 1993. Digest of Technical Papers. 40th ISSCC., 1993 IEEE International

Conference_Location

San Francisco, CA, USA

Print_ISBN

0-7803-0987-1

Type

conf

DOI

10.1109/ISSCC.1993.280063

Filename

280063