Patent ID: 6927762

Claim:
An electromagnetic-induction system, said electromagnetic-induction system comprising: an antenna loop for receiving and emitting the electromagnetic wave with a specific frequency; an analogy-switch group being coupled with said antenna loop; a control sub-circuit being coupled to said analogy-switch group; a first operator being coupled to said control sub-circuit and receiving the signal from said control sub-circuit to perform operation; and an application specific integrated circuit, being individually coupled to said control sub-circuit said analogy-switch group and said first operator, wherein said application specific integrated circuit comprises: a filter being coupled to said analogy-switch group and receiving the signal from said analogy-switch group; a gain amplifier being coupled to said filter and receiving the signal from said filter; a second operator being coupled to said control sub-circuit and receiving the signal from said control sub-circuit to perform operation; a frequency generator being coupled to said control sub-circuit and receiving the signal from said control sub-circuit so as to generate the special frequency; a counter; and a latch device being coupled to said counter and receiving the signal from said counter.