Patent ID: 7609123
Filing Date: 2009-10-27
Classification: H03B,H03C

Abstract:
1. A direct modulation type voltage-controlled oscillator for oscillating a signal in which a carrier wave component is modulated by a modulated wave component, the direct modulation type voltage-controlled oscillator comprising: a first variable capacitor section having a first terminal and a second terminal, the first variable capacitor section including a variable capacitor whose capacitance value varies in accordance with a potential difference between a control voltage, corresponding to the carrier wave component, which is fed to the first terminal and a first reference voltage applied to the second terminal; a second variable capacitor section having a first terminal and a second terminal, the second variable capacitor section including a variable capacitor whose capacitance value varies in accordance with a potential difference between a control voltage, corresponding to the modulated wave component, which is fed to the first terminal and a second reference voltage applied to the second terminal; and a voltage setting section operable to set the control voltage corresponding to the modulated wave component based on the second reference voltage, wherein the voltage setting section includes: