PURPOSE: To furthermore miniaturize a voltage control oscilla-tion circuit used for a mobile communication terminal
CONSTITUTION: In this voltage control oscillation circuit having a resonance circuit 1 incorporated with a variable capacitance diode band a transistor Q, a line L3 with prescribed length shorter than 1/4 wavelength corresponding to the resonance frequency of a resonance circuit is formed on a substrate, the 1st capacitor element C1 having a capacitance value generating low impedance less than a prescribed value is connected between one end of the line L3 and earth, the 2nd capacitor element C2 having a capacitance value generating high impedance more than the prescribed value at the time of checking impedance from the other end to the one end is connected between the other end of the line L3 and the earth, and control voltage is impressed from one end of the line L3 to the diode D through the other end.
UEDA HIROKAZU
CHONO GAKUYO
