Low-power MOS integrated filter with transconductors with spoilt current sources

Author

van de Gevel, M. ; Kuenen, J.C. ; Davidse, J. ; Roermund, A.H.M.

Author_Institution

Dept. of Electr. Eng., Delft Univ. of Technol., Netherlands

Volume

32

Issue

10

fYear

1997

fDate

10/1/1997 12:00:00 AM

Firstpage

1576

Lastpage

1581

Abstract

It is shown that an MOS weak-inversion differential pair can be linearized considerably by replacing the tail current source with a MOSFET biased in the weak-inversion triode region. Calculations show that the transconductance can be kept constant to within +5%/-0% for input voltages up to 130 mV. This linearized differential pair is used in a third-order transconductance-C bandpass filter with 18 Hz and 142 Hz cutoff frequencies, which draws 4.9 nA from a 1.8-V supply. Its dynamic range is 62 dB and its active area is 0.5 mm²

Keywords

MOS analogue integrated circuits; active filters; band-pass filters; constant current sources; 1.8 V; 142 Hz; 18 Hz; 4.9 nA; MOSFET; active area; dynamic range; linearized differential pair; low-power MOS integrated filter; spoilt current source; third-order transconductance-C bandpass filter; transconductor; weak-inversion triode; Active filters; Band pass filters; Differential amplifiers; Equations; Low voltage; MOSFET circuits; Resistors; Tail; Transconductance; Transconductors;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/4.634668

Filename

634668