| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method and a circuit for demodulating a signal transmitted by an electromagnetic transponder. <P>SOLUTION: The electromagnetic transponder reader has a sensor on an oscillation circuit of a parameter which is a function of a load of the transponder, a phase demodulator and an amplitude demodulator which are parallel functionally at least for receiving a signal from the sensor, an adder for the results of the demodulators, and a delay element serially connected with one demodulator for compensating a propagation time difference between the both. <P>COPYRIGHT: (C)2004,JPO</p> |
