Title:
RECTIFICATION CIRCUIT AND RADIO COMMUNICATION DEVICE USING THE SAME
Document Type and Number:
WIPO Patent Application WO/2007/148401
Kind Code:
A1
Abstract:
When a demodulation circuit is connected in parallel to the input of a radio tag multi-stage
rectification circuit, the rectification circuit is affected by the impedance
of the demodulation circuit to increase the minimum input power for generating
a predetermined power voltage and the communication distance between a radio
tag and a reader/writer device is shortened. In order to solve this problem, the
demodulation circuit is connected at an intermediate stage of the multi-stage
rectification circuit so as to reduce the affect of the impedance of the demodulation
circuit and enable generation of a predetermined power supply voltage even if
the communication distance between the radio tag and the reader/writer device
is large and the input power to the radio tag is small.
Inventors:
OGAWA TAKASHI (JP)
TAKIKAWA KUMIKO (JP)
TANAKA SATOSHI (JP)
OSHIMA TAKASHI (JP)
ASHIZAWA MINORU (JP)
TAKIKAWA KUMIKO (JP)
TANAKA SATOSHI (JP)
OSHIMA TAKASHI (JP)
ASHIZAWA MINORU (JP)
Application Number:
PCT/JP2006/312530
Publication Date:
December 27, 2007
Filing Date:
June 22, 2006
Export Citation:
Assignee:
HITACHI LTD (JP)
OGAWA TAKASHI (JP)
TAKIKAWA KUMIKO (JP)
TANAKA SATOSHI (JP)
OSHIMA TAKASHI (JP)
ASHIZAWA MINORU (JP)
OGAWA TAKASHI (JP)
TAKIKAWA KUMIKO (JP)
TANAKA SATOSHI (JP)
OSHIMA TAKASHI (JP)
ASHIZAWA MINORU (JP)
International Classes:
H02J17/00; G06K19/07; H02M7/10; H04B1/18; H04B1/59
Domestic Patent References:
| WO2006038314A1 | 2006-04-13 |
Foreign References:
| JP2000278887A | 2000-10-06 |
Attorney, Agent or Firm:
NITTO INTERNATIONAL PATENT OFFICE P.P.C. (3-3 Shinkawa 1-chome,Chuo-k, Tokyo 33, JP)
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