Title:
DIGITAL PROCESSING APPARATUS
Document Type and Number:
WIPO Patent Application WO/2007/114523
Kind Code:
A1
Abstract:
In an apparatus for converting an analog signal having a high periodicity to a digital
signal by use of an A/D converter for a digital processing, the occurrence of spurious
output caused by a malfunction of the A/D converter can be reduced. As a specific
solution, for example, in a frequency synthesizer of a particular type of system,
an A/D converter is placed on the output side of a voltage controlled oscillator
and it is arranged that an output signal of the A/D converter be applied to a device,
which performs a digital processing, and that a result of the digital processing
be D/A converted and then applied back to the voltage controlled oscillator. In
this case, it is arranged that noise occurring in the band noise generator be added
to an input signal of the analog/digital converter and that the band noise be in
a band that does not affect the digital signal processing performed in the foregoing
device.
Inventors:
KOBATA TSUKASA (JP)
SHIOBARA TSUYOSHI (JP)
SHIOBARA TSUYOSHI (JP)
Application Number:
PCT/JP2007/057727
Publication Date:
October 11, 2007
Filing Date:
March 30, 2007
Export Citation:
Assignee:
NIHON DEMPA KOGYO CO (JP)
KOBATA TSUKASA (JP)
SHIOBARA TSUYOSHI (JP)
KOBATA TSUKASA (JP)
SHIOBARA TSUYOSHI (JP)
International Classes:
H03M1/08; H03K7/08; H03L7/08; H03L7/18
Foreign References:
| JP2001267922A | 2001-09-28 | |||
| JPH03283822A | 1991-12-13 | |||
| JPH06132825A | 1994-05-13 |
Other References:
See also references of EP 2003783A4
Attorney, Agent or Firm:
INOUE, Toshio (3-29 Sumiyoshi-cho, Naka-ku,Yokohama-sh, Kanagawa 13, JP)
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