Skew corner driver compensation
AssigneeRenesas Electronics America Inc.
InventorsSteven Ernest Finn, Preston Blaire Sluder
Life of this patent
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Abstract
Systems and methods for skew compensation in a push-pull driver are described. A device can include a first circuit configured to output a skew measurement of an output driver stage in a driver circuit. The device can further include a second circuit configured to determine a first skew parameter based on the skew measurement and apply a first bias that is dependent on the skew measurement to drive a high-side transistor in the output driver stage. The device can further include a third circuit configured to determine a second skew parameter based on the skew measurement and apply a second bias that is dependent on the skew measurement to drive a low-side transistor in the output driver stage. The first bias and the second bias can be complementary.
Claims17
A semiconductor device comprising:
- a first circuit configured to output a skew measurement of an output driver stage in a driver circuit;
- a second circuit configured to:
- determine a first skew parameter based on the skew measurement;
- and
- apply a first bias that is dependent on the skew measurement to drive a high-side transistor in the output driver stage;
- and
- a third circuit configured to:
- determine a second skew parameter based on the skew measurement;
- and
- apply a second bias that is dependent on the skew measurement to drive a low-side transistor in the output driver stage, wherein the first bias and the second bias are complementary,
- wherein:
- the first circuit comprises a replica of the high-side transistor and a replica of the low-side transistor;
- and
- the skew measurement indicates an imbalance between the replica of the high-side transistor and the replica of the low-side transistor.
An apparatus comprising:
- a controller configured to receive an input signal;
- an output driver stage comprising a high-side transistor and a low-side transistor, the output driver stage being configured to switch the high-side transistor and the low-side transistor to output an output voltage that represents the input signal;
- and
- a circuit configured to:
- determine a skew measurement of the output driver stage;
- determine a first skew parameter based on the skew measurement;
- apply a first bias that is dependent on the skew measurement to drive the high-side transistor;
- determine a second skew parameter based on the skew measurement;
- and
- apply a second bias that is dependent on the skew measurement to drive the low-side transistor, wherein the first bias and the second bias are complementary,
- wherein:
- the circuit comprises a replica of the high-side transistor and a replica of the low- side transistor;
- and
- the skew measurement indicates an imbalance between the replica of the high-side transistor and the replica of the low-side transistor.
A method for operating a driver circuit, the method comprising:
- determining a skew measurement of an output driver stage of a driver circuit;
- determining a first skew parameter based on the skew measurement;
- applying a first bias that is dependent on the skew measurement to drive a high-side transistor of the output driver stage;
- determining a second skew parameter based on the skew measurement;
- and
- applying a second bias that is dependent on the skew measurement to drive a low-side transistor of the output driver stage, wherein:
- the first bias and the second bias are complementary;
- and
- the skew measurement indicates an imbalance between a replica of the high-side transistor and a replica of the low-side transistor.
Dependencies are inferred from the claim text.