Title:
ELECTRONIC CIRCUIT, METHOD FOR MODULATING, AND, APPARATUS AND METHOD FOR INFORMATION PROCESSING
Document Type and Number:
Japanese Patent JP3891421
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To realize a suppression of occurring frequency of a communication fault at a receiver side when digital data are transmitted via an antenna including a resonance circuit by an amplitude modulation.
SOLUTION: A shaping waveform applicator 61 inputs a first pulse signal 22 corresponding to transmitted data output from a transmitted data output unit 12, and applies a signal wave corresponding to a second pulse signal 71 waveform shaped from the first pulse signal 22 to a modulation amplifier 13. A carrier 22 applied to a base of a transistor of the amplifier 13 is amplitude-modulated by a signal wave corresponding to the second pulse signal 71 applied to its emitter to an amplitude modulated wave 72 strengthened at a modulated part of the amplitude. The wave 72 is supplied to the antenna 14 including a resonance circuit via its collector, and transmitted as an electromagnetic wave 73 from the antenna 14. For example, this electronic circuit can be applied to an R/W (reader/writer) unit of a non-contact IC card system.
Inventors:
Tatsuo Maeda
Akihiko Yamagata
Akihiko Yamagata
Application Number:
JP2002301256A
Publication Date:
March 14, 2007
Filing Date:
October 16, 2002
Export Citation:
Assignee:
ソニー株式会社
International Classes:
H03C1/00; H03C1/36; H04L27/02; H03C1/44; H04B1/59; H04L27/04; H04L27/36; (IPC1-7): H04L27/02; H03C1/00; H04B1/59
Domestic Patent References:
| JP2002092554A | ||||
| JP2070524U | ||||
| JP62245733A | ||||
| JP5206826A | ||||
| JP11355367A | ||||
| JP8181728A |
Attorney, Agent or Firm:
Yoshio Inamoto