| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for acquiring electric field strength information advantageous to obtain the information by using a receiving unit SE1 from an electromagnetic signal in which an input voltage IN to an operational amplifier V1 having a fixed amplification factor is generated by using an input resistor R1 from a signal UIN received by the receiving unit and a ratio of the voltage IN to an output voltage UOUT is decided. <P>SOLUTION: The method for acquiring information on the electric field strength comprises the steps of comparing an output signal of the operational amplifier with a reference voltage UREF, comparing a value of a changed input resistance with a value filed in a value field so that the input voltage IN of the amplifier is changed by using the change of the input resistance with the result that the output voltage falls within a predetermined range including the value of the reference voltage, and finding an electric field strength of the received signal. <P>COPYRIGHT: (C)2003,JPO |
