A Floating-Point A/D Converter with Self-Calibration

Goichi OOTOMO  Kousuke TSUKAMOTO  Takeshi WATAHIKI  Takeo MIYATA  

IEICE TRANSACTIONS (1976-1990)   Vol.E71   No.12   pp.1303-1309
Publication Date: 1988/12/25
Online ISSN: 
Print ISSN: 0000-0000
Type of Manuscript: PAPER
Category: Software Systems

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This paper describes an A/D converter for signal processing applications which has a floating point format. This converter has been implemented using CMOS switches, an operational amplifier, a comparator, a binary weighted capacitor-array, and D/A converter for calibration. A 13-bit accuracy has been achieved with the self-calibration technique although the capacitor-array used has a 9-bit accuracy. Also other errors like stray capacitances, charge injection of the CMOS switches etc. are compensated by calibration circuit.