| 摘要 |
PROBLEM TO BE SOLVED: To provide an AM receiving circuit capable of effective suppression of a tracking error even with a simple circuit structure. SOLUTION: The AM receiving circuit is provided with: an antenna tuning circuit 102 including an antenna coil 30 and a variable capacity diode 32; and an oscillation side circuit 104 including an oscillation coil 40 and a variable capacity diode 44. C-V characteristics of the variable capacity diode 44 include an area showing non-linearity where an inclination of decrease change in capacity decreases as applied voltage rises in the case that the capacity C is displayed by logarithm. C-V characteristics of the variable capacity diode 32 are higher in linearity than the variable capacity diode 44 when the capacity C is displayed by logarithm. COPYRIGHT: (C)2008,JPO&INPIT
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