Title:
A/D変換装置
Document Type and Number:
Japanese Patent JP4275688
Kind Code:
B2
Abstract:
An up-converter 124 frequency-up-converts an analog signal Sm. A down-converter 121 frequency-down-converts analog signal Sm. A signal selection block 125 selects one of the frequency-up-converted signal Sfu and frequency-down-converted signal Sfd. The signal Se selected by the signal selection block 125 is provided to the primary winding of a transformer 127. A signal induced in the secondary winding of the transformer 127 is provided to an A/D converter 128 to produce a digital signal Dm. For example, if the analog signal Sm has DC or a low frequency close to DC, the signal Sfu is selected as the signal Se. If the analog signal Sm does no have DC nor a low frequency close to DC, the signal Sfd is selected as the signal Se.
Inventors:
Akira Nara
Application Number:
JP2006226842A
Publication Date:
June 10, 2009
Filing Date:
August 23, 2006
Export Citation:
Assignee:
Tektronix International Sales GmbH
International Classes:
H03M1/12; G01R23/16
Domestic Patent References:
| JP2004312587A | ||||
| JP2008501933A | ||||
| JP8088577A | ||||
| JP63061817U |
Attorney, Agent or Firm:
Kunio Yamaguchi
Takashi Yamaguchi
Takashi Yamaguchi