| 摘要 |
A voltage control oscillator used in mobile communication systems such as cellular phones and video machines. An oscillation output of the first output oscillation circuits (1a) enters a broad band buffer amplifier circuit (4) through a stage-to-stage coupling capacitor (22) and an oscillation output of the second output oscillation circuit (1b) enters the broad band buffer amplifier circuit (4) through frequency selective filters (3a, 3b) and the stage-to-stage coupling capacitor (22). On/off operation of a control voltage of a switch terminal (2) installed on the first or second output oscillation circuit outputs selectively an oscillation signal from the first or second output oscillation circuit. |
