Patent ID: 6621364
Filing Date: 2003-09-16
Classification: H03C

Abstract:
A voltage-controlled oscillator for frequency modulation, comprising:an oscillator core including a tunable, frequency-determining resonant circuit component and a frequency-determining modulator component; a first terminal for supplying a control voltage, said first terminal being coupled to said frequency-determining modulator component and being connected to said tunable, frequency-determining resonant circuit component for providing a frequency tuning; a second terminal for supplying a modulation signal connected to said frequency-determining modulator component; a third terminal for supplying a bias voltage; an output terminal coupled to said oscillator core, said output terminal providing an output signal, the output signal being frequency modulated in dependence on the modulation signal and having a carrier frequency tuned in dependence on the control voltage; and said frequency-determining modulator component including a first voltage-controlled capacitance and a second voltage-controlled capacitance connected in parallel to said first voltage-controlled capacitance, said first voltage-controlled capacitance being connected to said first terminal for supplying the control voltage and being controlled by the control voltage, said second voltage-controlled capacitance being connected said third terminal for supplying the bias voltage.