Contactless IC card system
AssigneeSony Corporation
InventorShigeru Arisawa
Life of this patent
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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.
Claims9
A modulating circuit, comprising:
- first signal output means for outputting a first output signal having a first predetermined phase with respect to that of an input signal;
- second signal output means for outputting a second output signal having a second predetermined phase with respect to that of said input signal;
- gate means for gating at least said second output signal;
- calculation means for adding or subtracting said first output signal and said second output signal;
- and
- control means for controlling the operation of said gate means in response to a logic level of input data.
Dependencies are inferred from the claim text.