Flicker noise cancellation in oscillators
AssigneeQUALCOMM Incorporated
InventorsSylvain M. Colin, Jun Young Park, Marzio Pedrali Noy
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Abstract
An oscillator is disclosed. The oscillator includes a first capacitor. The oscillator also includes a second capacitor. The oscillator further includes a first current source. The oscillator also includes a second current source. The oscillator further includes a comparator that has a first input and a second input. The oscillator also includes a reference node. The oscillator further includes a controller that is configured to selectively couple the first current source to the first capacitor and the second current source to the reference node during a first time period.
Claims55
A method for flicker noise cancellation in an oscillator, the method comprising:
- selectively coupling a first current source to a first capacitor of the oscillator during a first time period of an oscillation period of the oscillator;
- and
- selectively coupling the first current source to a reference node of the oscillator during a second time period of the oscillation period.
An oscillator comprising:
- a first capacitor;
- a reference node;
- and
- a controller configured to selectively couple a first current source to the first capacitor during a first time period and to selectively couple the first current source to the reference node during a second time period.
An oscillator comprising:
- a first capacitor;
- a second capacitor;
- a first current source;
- a second current source;
- a comparator, wherein the comparator has a first input and a second input;
- a reference node;
- and
- a controller, wherein the controller is configured to selectively couple the first current source to the first capacitor and the second current source to the reference node during a first time period.
A method for flicker noise cancellation in an oscillator, the method comprising:
- selectively configuring a comparator with one of a first configuration, a second configuration, a third configuration, a fourth configuration or a fifth configuration, wherein the comparator has a first input and a second input;
- and
- cycling components of the oscillator through multiple states using a controller, wherein the components of the oscillator comprise a first current source, a second current source, a first capacitor, a second capacitor and a reference node, and wherein cycling the components of the oscillator through multiple states causes the oscillator to oscillate with reduced flicker noise.
An apparatus for flicker noise cancellation in an oscillator, comprising:
- means for selectively configuring a comparator with one of a first configuration, a second configuration, a third configuration, a fourth configuration and a fifth configuration, wherein the comparator has a first input and a second input;
- and
- means for cycling components of the oscillator through multiple states using a controller, wherein the components of the oscillator comprise a first current source, a second current source, a first capacitor, a second capacitor and a reference node, and wherein cycling the components of the oscillator through multiple states causes the oscillator to oscillate with reduced flicker noise.
Dependencies are inferred from the claim text.