Method and apparatus for adjusting a reference
AssigneePower Integrations, Inc.
InventorZhao-Jun Wang
Life of this patent
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Abstract
Examples of a method and apparatus for adjusting a reference. One circuit includes a current divider to divide a current from a current source into a first current and a reference current. The circuit also includes a current mirror coupled to the current divider to receive the first current from the current divider and to receive an adjustment current. The adjustment current is to set the reference current such that the reference current is adjustable between a full value and a fraction of the full value in response to the adjustment current. A change in the reference current and a change in the adjustment current are proportional when the adjustment current is between an upper and a lower threshold value.
Claims17
A circuit, comprising:
- a current divider to divide a current from a current source into a first current and a reference current;
- and
- a current mirror coupled to the current divider to receive the first current from the current divider and to receive an adjustment current, the adjustment current to set the reference current such that the reference current is adjustable between a full value and a fraction of the full value in response to the adjustment current, wherein a change in the reference current and a change in the adjustment current are proportional when the adjustment current is between an upper and a lower threshold value.
A method, comprising:
- dividing a source current into a first current and a second current such that a sum of the first and the second current is substantially equal to the source current;
- mirroring an adjustment current into the first current;
- and
- adjusting the second current in response to the adjustment current such that the second current is adjustable between a full value and a fraction of the full value in response to the adjustment current, wherein a change in the second current and a change in the adjustment current are proportional when the adjustment current is between an upper and a lower threshold value.
Dependencies are inferred from the claim text.