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.
Claims54
A method for flicker noise cancellation in an oscillator, the method comprising:
- coupling a first current source to a first capacitor of the oscillator during a first time period of an oscillation period of the oscillator;
- coupling the first current source to a reference node of the oscillator during a second time period of the oscillation period;
- and
- coupling a second current source to a second capacitor of the oscillator during a third time period of the oscillation period.
An oscillator comprising:
- a first capacitor;
- a second capacitor;
- a reference node;
- a first controller configured to couple a first current source to the first capacitor during a first time period and to couple the first current source to the reference node during a second time period;
- and
- a second controller configured to couple a second current source to the second capacitor during a third time period.
An oscillator comprising:
- a first capacitor;
- a second capacitor;
- a first current source;
- a second current source;
- a reference node;
- and
- a controller, wherein the controller is configured to couple the first current source to the first capacitor and the second current source to the reference node during a first time period, wherein the controller is configured to couple the first current source to the reference node and the second current source to the second capacitor during a second time period, and wherein a sum of the first time period and the second time period is substantially equal to an oscillation period of the oscillator.
A method for flicker noise cancellation in an oscillator, the method comprising:
- selectively configuring a first input and a second input to a comparator with one of a first configuration, a second configuration, a third configuration, a fourth configuration or a fifth configuration;
- 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 first input and a second input to a comparator with one of a first configuration, a second configuration, a third configuration, a fourth configuration and a fifth configuration;
- 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.