A Current Mode Cyclic A/D Converter with Submicron Processes

Masaki KONDO
Hidetoshi ONODERA
Keikichi TAMARU

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E80-A    No.2    pp.360-364
Publication Date: 1997/02/25
Online ISSN: 
Print ISSN: 0916-8508
Type of Manuscript: Special Section LETTER (Special Section on Analog Circuit Techniques for System-on-Chip Integration)
A/D,  A/D converter,  current mode,  ratio-independent,  RGC,  

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We present a current mode cyclic analog-to-digital converter that is suitable for submicron LSI fabrication processes. Our converter is composed of sample-and-hold circuits with regulated cascode configuration which offers high output impedance and wide outoput range. The circuit requires small area since the architecture depends on neither precise analog transistors nor ratio-matched capacitors. We have designed and fabricated a test circuit that has an area of 0.014mm2 using a 0.8µm CMOS process. The circuit is examined to perform 8-bit resolution at a sampling rate of 40kHz and average power dissipation of 370µW at 4V supply voltage.