Paper Info
Title
A 120dB input dynamic range, current-input current-output CMOS logarithmic amplifier with 230ppm/°K temperature sensitivity
Abstract
This paper presents the design of a current-mode CMOS logarithmic amplifier, which by design is insensitive to ambient temperature variations. Its operational current ranges over 100fA - 100nA, which covers the full range of sub-threshold region. Unlike conventional logarithmic amplifiers, the proposed approach directly produces a current signal as a logarithmic function of the input current. The core of the proposed circuit is translinear ohm's law principle, which is implemented by a floating-voltage source and a pseudo-linear resistive element within a translinear loop. The temperature sensitive parameters are reduced using a translinear-based resistive cancelation technique. Measured results from prototypes fabricated in a 0.5 μm CMOS process show that the amplifier exhibits an input dynamic range of 120dB and a temperature sensitivity of 230 ppm/°K.
Year
DOI
Venue
2013
10.1109/MWSCAS.2013.6674700
Circuits and Systems
Keywords
Field
DocType
cmos integrated circuits,amplifiers,current-mode circuits,ambient temperature variations,current 100 fa to 100 na,current-mode cmos logarithmic amplifier,floating-voltage source,pseudolinear resistive element,size 0.5 mum,subthreshold region,temperature sensitive parameters,translinear loop,translinear ohm's law principle,translinear-based resistive cancelation technique
Dynamic range,Resistive touchscreen,Ohm,Log amplifier,CMOS,Cmos process,Electronic engineering,Logarithm,Electrical engineering,Physics,Amplifier
Conference
ISSN
Citations 
PageRank 
1548-3746
0
0.34
References 
Authors
6
2
Name
Order
Citations
PageRank
Ming Gu100.68
Shantanu Chakrabartty233564.30