Single-staged balanced-output inductor-free oscillator and method thereof
AssigneeRealtek Semiconductor Corp.
InventorChia-Liang Lin
Life of this patent
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Abstract
A single-staged balanced-output inductor-free oscillator and method thereof are provided. In one implementation an apparatus includes a first network comprising a first amplifier configured in a self feedback topology via a first feedback network for generating a first end of an output signal; a second network comprising a second amplifier configured in a self feedback topology via a second feedback network for generating a second end of the output signal; and a cross-coupling network for cross-coupling the first end and the second end of the output signal, wherein the first network and the second network share a common supply current and the first feedback network and the second feedback network are configured in a cross-controlling topology.
Claims17
An oscillator comprising:
- a first network comprising a first amplifier configured in a self feedback topology via a first feedback network for generating a first end of an output signal;
- a second network comprising a second amplifier configured in a self feedback topology via a second feedback network for generating a second end of the output signal;
- and
- a cross-coupling network for cross-coupling the first end and the second end of the output signal, wherein the first feedback network and the second feedback network are configured in a cross-controlling topology, wherein a total effective resistance of the first feedback network decreases when a magnitude of the second end of the output signal increases and a total effective resistance of the second feedback network decreases when a magnitude of the first end of the output signal increases.
An oscillator comprising:
- a first amplifier including a first feedback network for outputting a first end of an output signal;
- a second amplifier including a second feedback network for outputting a second end of the output signal;
- a circuit for providing a supply current to the first amplifier and the second amplifier;
- and
- a cross-coupling network for cross-coupling the first end and the second end of the output signal, wherein the first feedback network is controlled by the second end of the output signal, and the second feedback network is controlled by the first end of the output signal, wherein a total effective resistance of the first feedback network decreases when a magnitude of the second end of the output signal increases and a total effective resistance of the second feedback network decreases when a magnitude of the first end of the output signal increases.
A method applied to an oscillator comprising:
- generating a first end of an output signal by amplifying a first end of an intermediate signal;
- generating a second end of the output signal by amplifying a second end of the intermediate signal;
- cross-coupling the first end and the second end of the output signal;
- coupling the first end of the output signal to the first end of the intermediate signal using a first feedback network controlled by the second end of the output signal;
- coupling the second end of the output signal to the second end of the intermediate signal using a second feedback network controlled by the first end of the output signal, wherein a total effective resistance of the first feedback network decreases when a magnitude of the second end of the output signal increases and a total effective resistance of the second feedback network decreases when a magnitude of the first end of the output signal increases.
Dependencies are inferred from the claim text.