Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
SEMICONDUCTOR DEVICE AND IC CARD
Document Type and Number:
WIPO Patent Application WO/2006/117834
Kind Code:
A1
Abstract:
A semiconductor device is provided with a demodulating circuit (1) for demodulating an amplitude-modulated voltage signal. The demodulating circuit is provided with a detecting circuit (10) which detects the amplitude-modulated voltage signal with a prescribed sensitivity and has the detection sensitivity variable. Since the detection sensitivity to the amplitude-modulated voltage signal is variable, the detection sensitivity is increased when a wireless communication distance is increased and a signal level is reduced, and on the contrary, the detection sensitivity is reduced when the wireless communication distance is reduced and the signal level is increased. The reliability of the communication using the amplitude modulation is easily improved.

More Like This:
JPH033424RECEIVER
JP2001502514INDUSTRIAL APPLICABILITY Reception of a modulation carrier having an asymmetric sideband
WO/2006/008685DEMODULATOR FOR AMPLITUDE-MODULATED SIGNALS
Inventors:
OKUDA YUICHI (JP)
TSUNODA HISATAKA (JP)
WATANABE KAZUKI (JP)
Application Number:
PCT/JP2005/007789
Publication Date:
November 09, 2006
Filing Date:
April 25, 2005
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
RENESAS TECH CORP (JP)
OKUDA YUICHI (JP)
TSUNODA HISATAKA (JP)
WATANABE KAZUKI (JP)
International Classes:
H04L27/06; H03D1/00; H04B1/59; H04B5/02
Foreign References:
JPS5776960A1982-05-14
JPH01175029U1989-12-13
JP2002368830A2002-12-20
JP2003067693A2003-03-07
JP2001148621A2001-05-29
JPH11214960A1999-08-06
Attorney, Agent or Firm:
Tamamura, Shizuyo (Yamashiro Building 1, Kanda Ogawamachi 1-chom, Chiyoda-ku Tokyo, JP)
Download PDF:
View/Download PDF      PDF Help



 
Previous Patent: WATER TURBINE IN TETHERED ASYMMETRIC NOZZLE

Next Patent: TRANSMISSION SYSTEM AND OPTICAL TRANSMISSION SYSTEM