DocumentCode :
1531108
Title :
84-dB Range Logarithmic Digital-to-Analog Converter in CMOS 0.18- 
Technology
Author :
Purighalla, Sandhya ; Maundy, Brent
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Calgary, Calgary, AB, Canada
Volume :
58
Issue :
5
fYear :
2011
fDate :
5/1/2011 12:00:00 AM
Firstpage :
279
Lastpage :
283
Abstract :
This brief presents an 84-dB dynamic range true logarithmic amplifier. Logarithmic ordering in the output is achieved as a function of control parameter X, which in turn is tuned digitally. The result is a digitally controlled data conversion that yields a new type of logarithmic digital-to-analog converter. This 4-bit nonlinear converter has been fabricated in a TSMC 0.18-μm complimentary metal-oxide-semiconductor technology. Measurement results confirm theory and simulations, and display logarithmic transfer characteristics within [-1.36%, 0.84%] output linear error. The integrated circuit has dimensions of 1.5 × 1 mm2 and an average power consumption of 13.2 mW when powered with ±1.65-V supply voltages.
Keywords :
CMOS integrated circuits; digital-analogue conversion; CMOS technology; average power consumption; complimentary metal-oxide-semiconductor technology; digitally controlled data conversion; dynamic range true logarithmic amplifier; integrated circuit; logarithmic ordering; logarithmic transfer characteristics; nonlinear converter; power 13.2 mW; range logarithmic digital-to-analog converter; size 0.18 mum; supply voltage; Approximation methods; CMOS integrated circuits; CMOS technology; Digital-analog conversion; Gain; Resistors; Transfer functions; Digitally controlled variable resistor; dynamic range (DR) expansion; logarithmic digital-to-analog converter (DAC); pseudologarithmic amplifier; variable gain amplifier;
fLanguage :
English
Journal_Title :
Circuits and Systems II: Express Briefs, IEEE Transactions on
Publisher :
ieee
ISSN :
1549-7747
Type :
jour
DOI :
10.1109/TCSII.2011.2149030
Filename :
5782942
Link To Document :
