| 摘要 |
PURPOSE:To eliminate the generation of a distortion in a low frequency band, and to stabilize a degree of modulation by applying a frequency modulation to the second voltage control oscillator provided separately from a PLL, in an FM receiver. CONSTITUTION:From the first voltage control oscillator 5, the first signal f1 by which the maximum oscillation frequency f1max and the minimum oscillation frequency f1min are determined in accordance with an FM band is outputted. This first signalf f1, and second signal f2 of a constant frequency f2 outputted from the second voltage control oscillator 10 are added by the second mixer 11, and the third signal f3 shown by an expression I is formed. This third signal f3 is inputted to the first mixer 2 through a band pass filter 12, and a receiving signal (f) is subtracted from this third signal f3, by which an intermediate frequency signal fi shown in an expression II is obtained. |
