Contactless IC card system

Details Contactless IC card system Contactless IC card system

2006-03-21

2006-03-21

Tran, Khanh C. (Department: 2631)

Pulse or digital communications

Transmitters

Antinoise or distortion

C332S149000

Reexamination Certificate

active

07016432

ABSTRACT:
In a contactless IC card system, a modulating circuit manufactured in an IC form is operable at a high power efficiency. The demodulating apparatus is configured to include: first signal output means for outputting a first output signal having a predetermined phase with respect to that of an input signal, a second signal output means for outputting a second output signal having a predetermined phase with respect to that of the input signal, gate means for gating at least the second output signal, calculation means for adding, or subtracting the first output signal and the second output signal; and control means for controlling the operation of the gate means in response to a logic level of input data.

REFERENCES:
patent: 3919645 (1975-11-01), Ohsawa et al.
patent: 4307347 (1981-12-01), Thomson
patent: 4458216 (1984-07-01), Bingham
patent: 4546241 (1985-10-01), Walton
patent: 4583232 (1986-04-01), Howell
patent: 4661948 (1987-04-01), Shapiro et al.
patent: 4691202 (1987-09-01), Denne et al.
patent: 4937842 (1990-06-01), Howell
patent: 5517194 (1996-05-01), Carroll et al.
patent: 5949826 (1999-09-01), Iiyama et al.
patent: 6111459 (2000-08-01), Nishijima et al.
patent: 6198361 (2001-03-01), Arisawa
patent: 6529562 (2003-03-01), Muraishi
patent: 6570490 (2003-05-01), Saitoh et al.
patent: 0 677 815 (1995-10-01), None

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