Title:
A/D変換装置
Document Type and Number:
Japanese Patent JP4140534
Kind Code:
B2
Abstract:
A voltage-to-time conversion circuit compares a ramp-wave voltage, which steps up at a certain gradient, with each of a reference voltage, an input voltage, and a reference voltage, and produces a PB pulsating signal representing the times which the voltages require for having a predetermined relationship to the ramp-wave voltage. An encoder circuit converts the times into coded data items according to the ratios of the times to a common unit time. A normalization circuit determines a conversion characteristic curve on the basis of the coded data items, into which the times required by the reference voltages are converted, and A/D-converted values predefined for the reference voltages, and fits the coded data, into which the time required by the input voltage is converted, to the characteristic curve. Thus, the A/D-converted value of the input voltage Vin is calculated.
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Inventors:
Isomura Hirofumi
Application Number:
JP2004053803A
Publication Date:
August 27, 2008
Filing Date:
February 27, 2004
Export Citation:
Assignee:
株式会社デンソー
International Classes:
H03M1/52; H03K4/08; H03M1/50; H03M1/56
Domestic Patent References:
| JP59223023A | ||||
| JP2000078012A |
Attorney, Agent or Firm:
Tsuyoshi Sato
Kiyoshi Ogawa
Kiyoshi Ogawa