| 摘要 |
PROBLEM TO BE SOLVED: To provide a vehicular LF antenna drive device capable of reducing the generation of radio noise. SOLUTION: The vehicular LF antenna drive device has a square-wave generation means 10 for generating a square wave of a prescribed frequency, a state variable type band-pass filter 20 for outputting a sine wave, by making the square wave outputted from the square wave generation means 10 as the input, an antenna load 40 constituted of a serial connection circuit of an inductor L, a capacitor C, and a resistor R, and an antenna drive circuit 30 for driving the antenna load 40, by amplifying the sine wave outputted from the band-pass filter 20. The generation of harmonic components can be suppressed, since the antenna load 40 is driven by the sine wave, and radio noise can be reduced. COPYRIGHT: (C)2007,JPO&INPIT
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