Open AccessCMOS temperature compensated logarithmic converter based on master–slave control
Author(s) -
Bai Chunfeng,
Wu Jianhui
Publication year - 2014
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2014.2371
Subject(s) - logarithm , cmos , temperature coefficient , control theory (sociology) , master/slave , bandgap voltage reference , electronic engineering , electrical engineering , physics , mathematics , computer science , control (management) , engineering , voltage , voltage reference , mathematical analysis , artificial intelligence , operating system , dropout voltage
A logarithmic converter employing the proposed temperature compensating method based on a master–slave control is presented. With the help of a raised master–slave circuit, the proportional to absolute temperature (PTAT) coefficient of the logarithmic converter is compensated by that of the PTAT current in the bandgap reference, which makes the CMOS implementation of the logarithmic converter employing no external component possible. The logarithmic converter provides a 45 dB linear range with < 3 dB error as the temperature varies from 0 to 90°C.