A 2.5 V temperature compensated CMOS logarithmic amplifier

Author

Koli, Kimmo ; Halonen, Kari

Author_Institution

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

fYear

1997

fDate

5-8 May 1997

Firstpage

79

Lastpage

82

Abstract

A new temperature compensated low voltage current-mode CMOS logarithmic amplifier is presented. The logarithmic amplifier uses seven cascaded limiting current amplifiers for piece-wise approximation of the logarithmic function and a current peak detector for detecting signal amplitude with a dynamic range of 60 dB. The circuit uses a current reference to stabilize the temperature dependencies down to ±1 dB. The designed amplifier is fabricated with a 1.2 μm CMOS process. It operates with down to a 2.2 V single supply voltage and the power consumption is 3 mW with a 2.5 V supply

Keywords

CMOS analogue integrated circuits; compensation; feedback amplifiers; operational amplifiers; 1.2 micron; 2.2 V; 2.5 V; 3 mW; CMOS logarithmic amplifier; cascaded limiting current amplifiers; current peak detector; current reference; current-mode amplifier; dynamic range; piece-wise approximation; power consumption; signal amplitude; temperature compensation; temperature dependencies; CMOS technology; Differential amplifiers; Dynamic range; Electronic circuits; Low voltage; MOSFETs; Operational amplifiers; Signal detection; Temperature; Topology;

fLanguage

English

Publisher

ieee

Conference_Titel

Custom Integrated Circuits Conference, 1997., Proceedings of the IEEE 1997

Conference_Location

Santa Clara, CA

Print_ISBN

0-7803-3669-0

Type

conf

DOI

10.1109/CICC.1997.606589

Filename

606589