| 摘要 |
Provided is a control method of a frequency variable filter circuit including a resonant circuit of an inductor and a variable capacitance unit, the method including: determining a center frequency of the frequency variable filter circuit, wherein the variable capacitance unit includes a capacitor bank, a capacitance value Y of the capacitor bank is expressed by an equation below with respect to an assigned frequency, and the center frequency thereof is determined by deciding coefficientsα,β, A, B and C. Y=A×(α−X)n+B×(α−X)(n-1)+C×(α−X)(n-2)+ . . . +β(where, X is the assigned frequency, Y is the capacitance value of the capacitor bank,αis an offset frequency coefficient,βis a correction coefficient for correcting frequency shift, A, B and C are correction coefficients for correcting frequency shift of the center frequency with respect to the assigned frequency, and n is a positive integer equal to or larger than 2)
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