A fully differential class-AB switched-current integrator for signal processing

Author

Koli, Kimmo ; Halonen, Kari

Author_Institution

Lab. of Electron. Circuit Design, Helsinki Univ. of Technol., Espoo, Finland

Volume

32

Issue

2

fYear

1997

fDate

2/1/1997 12:00:00 AM

Firstpage

238

Lastpage

244

Abstract

A switched-current integrator is designed with a 1.2-μm CMOS process. The use of fully differential and complementary topology also enables class-AB operation in the circuit. Without sacrificing speed, the designed circuit reduces the clock-feedthrough error more than 20 dB compared to a single-transistor SI-cell. With the designed integrator, a fully differential sixth-order switched-current ladder filter with transmission zeros is realized. The designed circuit has a 10-MHz clock with an approximately 600 kHz corner frequency. The measurements show comparable performance to single-ended SC- and active-RC-filters with smaller die area and fabrication costs

Keywords

CMOS analogue integrated circuits; active filters; analogue processing circuits; integrating circuits; ladder filters; poles and zeros; switched current circuits; switched filters; 1.2 micron; 10 MHz; 600 kHz; CMOS process; class-AB SI integrator; clock-feedthrough error reduction; complementary topology; fully differential SI integrator; signal processing; sixth-order SI ladder filter; switched-current integrator; transmission zeros; Area measurement; CMOS process; Circuit topology; Clocks; Costs; Fabrication; Filtering theory; Filters; Frequency; Integrated circuit measurements;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/4.551916

Filename

551916