Title :
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
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;
Conference_Titel :
Custom Integrated Circuits Conference, 1997., Proceedings of the IEEE 1997
Conference_Location :
Santa Clara, CA
Print_ISBN :
0-7803-3669-0
DOI :
10.1109/CICC.1997.606589
