Voltage controlled oscillator and control method thereof
AssigneeMediatek Inc.
InventorsChao-Ching Hung, Po-Chun Huang, Yu-Li Hsueh
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Abstract
A voltage-controlled oscillator for generating oscillation signals at two output terminals includes an inductor coupled between the two output terminals, a capacitor coupled between the two output terminals, two P-type transistors, coupled between a supply voltage and the two output terminals, two N-type transistors coupled between a ground voltage and the two output terminals, and a control circuit. The control circuit is coupled to the inductor, and is arranged to control a current flowing through the two P-type transistors and the inductor by controlling a voltage of the inductor.
Claims19
A voltage-controlled oscillator for generating oscillation signals at two output terminals, comprising:
- an inductor coupled between the two output terminals;
- a capacitor coupled between the two output terminals;
- two P-type transistors, coupled between a supply voltage and the two output terminals;
- two N-type transistors, coupled between a ground voltage and the two output terminals;
- and
- a control circuit, coupled to the inductor, for controlling a current flowing through the two P-type transistors and the inductor by controlling DC voltages of the two output terminals.
A voltage-controlled oscillator for generating oscillation signals at two output terminals, comprising:
- an inductor coupled between the two output terminals;
- a capacitor coupled between the two output terminals;
- two P-type transistors, coupled between a supply voltage and the two output terminals;
- two N-type transistors, coupled between a ground voltage and the two output terminals;
- and
- a control circuit, coupled to the inductor, for turning on or off the two N-type transistors.
A method for controlling a voltage controlled oscillator, comprising:
- when the voltage controlled oscillator is in a start-up stage, controlling the voltage controlled oscillator to operate as a P-type voltage controlled oscillator;
- and
- when the voltage controlled oscillator is in a normal stage following the start-up stage, controlling the voltage controlled oscillator to operate as a PN-type voltage controlled oscillator.
Dependencies are inferred from the claim text.