A/D converter and D/A converter employing a rodix smaller than a two, and calibration thereof

摘要

PCT No. PCT/FI91/00209 Sec. 371 Date Mar. 1, 1993 Sec. 102(e) Date Mar. 1, 1993 PCT Filed Jul. 2, 1991 PCT Pub. No. WO92/00630 PCT Pub. Date Jan. 9, 1992.A converter system is comprised of an analog-to-digital converter (1) and a digital-to-analog converter (2). A first base number of a number system used in the analog-to-digital converter is less than 2, and a second base number of a number system used in the digital-to-analog converter is less than two. The first base number does not equal the second base number. For example, both are within a range from 1.90 to 1.99. In a calibration method the output of the digital-to-analog converter is switched to the input of the analog-to-digital converter, and a controller (3) provides digital values to the input of the digital-to-analog converter, and receives corresponding digital values from the output of the analog-to-digital converter.