Title:
ANALOG/DIGITAL CONVERTER AND ANALOG/DIGITAL CONVERSION METHOD
Document Type and Number:
Japanese Patent JP2015103820
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide an analog/digital converter (ADC) that performs analog/digital conversion at high speed.SOLUTION: The ADC includes a first conversion part, a selector and a second conversion part. The first conversion part generates a high-order bit digital signal by performing analog/digital conversion on an analog signal during a first period. The selector selects one or more reference voltages on the basis of the high-order bit digital signal, thereby obtaining a selected reference voltage group within a narrower voltage range in comparison with a full scale. The second conversion part generates a low-order bit digital signal by performing analog/digital conversion on an analog signal while using the selected reference voltage group. The first period starts prior to settling the analog signal to a precision corresponding to a total resolution of the first and second conversion parts.
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Inventors:
SHIRAISHI KEI
MATSUNO JUNYA
FURUTA MASANORI
ITAKURA TETSURO
MATSUNO JUNYA
FURUTA MASANORI
ITAKURA TETSURO
Application Number:
JP2013240445A
Publication Date:
June 04, 2015
Filing Date:
November 20, 2013
Export Citation:
Assignee:
TOSHIBA CORP
International Classes:
H03M1/14
Attorney, Agent or Firm:
Kurata Masatoshi
Yoshihiro Fukuhara
Nobuhisa Nogawa
Takashi Mine
Naoki Kono
Katsu Sunagawa
Morisezo Iseki
Takao Ako
Tadashi Inoue
Tatsushi Sato
Takashi Okada
Mihoko Horiuchi
Yoshihiro Fukuhara
Nobuhisa Nogawa
Takashi Mine
Naoki Kono
Katsu Sunagawa
Morisezo Iseki
Takao Ako
Tadashi Inoue
Tatsushi Sato
Takashi Okada
Mihoko Horiuchi