H - Electricity – 03 – M
Patent
H - Electricity
03
M
354/88
H03M 1/06 (2006.01) H03M 1/00 (2006.01) H03M 1/46 (2006.01) H03M 1/68 (2006.01)
Patent
CA 1175942
ABSTRACT OF THE DISCLOSURE The analog output from a local DAC comprising an LDAC and an MDAC, in which the full scale of the LDAC is always larger than the quantized level of the MDAC, is compared with an input analog signal which is sampled and held. A digital code obtained by successive approxi- mation in accordance with the result of the comparison is stored in a successive approximation register. A shift code for calibrating the D/A conversion in the local DAC by shifting the digital code which is pre- viously allotted to each digital code is stored in a shift code generating circuit (ROM). The digital code from the successive approximation register is digitally shifted in accordance with the shift code by a code shift circuit such as a digital adder/subtractor to obtain an A/D conversion output. An analog to digital converter with a high accuracy and an improved conver- sion speed is inexpensively fabricated in the form of a one chip LSI by a usual CMOS process.
385753
Akazawa Yukio
Iwata Atsushi
Matsuya Yasuyuki
Gowling Lafleur Henderson Llp
Nippon Telegraph & Telephone Public Corporation
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