Title:
DIGITAL RECEPTION DEVICE
Document Type and Number:
WIPO Patent Application WO/2007/080715
Kind Code:
A1
Abstract:
A digital reception device includes a band pass type delta sigma A/D converter for
performing analog-digital conversion for converting a signal to be modulated in
an analog region into a signal in the digital region. It is possible to reduce the
thermal noise and power consumption of the band pass type delta signal A/D converter.
The digital reception device includes a signal level detection unit (9a) for
detecting the level of the IF signal SIF and a current control unit (10) for adjusting,
according to the detection result DETa, operation current of a calculation amplifier
as delay means as one of the components of a switched capacitor filter (7b) arranged
in the band pass type delta sigma A/D converter (7). As the electric field intensity
induced by an antenna (1) becomes smaller and the level of the IF signal SIF becomes
lower, the operation current of the calculation amplifier is made smaller so
as to reduce power consumption. As the electric field intensity induced by the
antenna (1) becomes greater and the level of the IF signal SIF becomes greater,
the operation current of the calculation amplifier is made greater so as to reduce
the thermal noise.
Inventors:
YAMAMOTO YUJI (JP)
Application Number:
PCT/JP2006/323815
Publication Date:
July 19, 2007
Filing Date:
November 29, 2006
Export Citation:
Assignee:
PIONEER CORP (JP)
YAMAMOTO YUJI (JP)
YAMAMOTO YUJI (JP)
International Classes:
H03M3/02; H03F3/70; H03G3/30; H04B1/16
Foreign References:
| JP2003124813A | 2003-04-25 | |||
| JP2005072632A | 2005-03-17 | |||
| JP2005198033A | 2005-07-21 | |||
| JPH11163731A | 1999-06-18 | |||
| JP2002135808A | 2002-05-10 | |||
| JP2002353815A | 2002-12-06 | |||
| JP2005286910A | 2005-10-13 |
Other References:
See also references of EP 1976127A4
Attorney, Agent or Firm:
EBISU International Patent Office (1-6-10 Ebisuminami, Shibuya-k, Tokyo 22, JP)
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