| 摘要 |
In a contactless IC card system, a modulating circuit manufactured in an IC form is operable in a high power efficiency. The demodulating apparatus is arranged by: 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.
|
