Methods and apparatus for driver calibration
AssigneeSemiconductor Components Industries, LLC
InventorSeiji Takeuchi
Life of this patent
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Abstract
Various embodiments of the present technology may comprise methods and apparatus for driver calibration. The methods and apparatus may comprise various circuits and/or systems to minimize an offset output current (e.g., a drive current) due to an offset voltage in an operational amplifier. The methods and apparatus may comprise a current comparator circuit and a replica circuit that operate in conjunction with each other to monitor the drive current and provide a feedback signal, which is then used to adjust the drive current and improve the accuracy of the drive current.
Claims20
A driver calibration circuit, comprising:
- a current comparator circuit configured to generate a threshold current and comprising a first node and a second node;
- a controller connected to the second node of the current comparator circuit;
- a digital-to-analog converter (DAC) connected to an output terminal of the controller;
- an amplifier connected to an output terminal of the DAC;
- a driver connected to an output terminal of the amplifier and configured to have a first current;
- and
- a replica circuit connected to:
- the first node of the current comparator circuit;
- the output terminal of the amplifier;
- and the driver;
- wherein the replica circuit is configured to have a second current that is proportional to the first current.
A system, comprising:
- an actuator;
- and
- a control circuit configured to control the actuator and comprising:
- a current comparator configured to generate a threshold current and comprising a first node and a second node;
- a controller connected to the second node of the current comparator;
- a digital-to-analog converter (DAC) connected to an output terminal of the controller;
- an amplifier connected to an output terminal of the DAC;
- a driver connected to an output terminal of the amplifier and configured to have a first current;
- and
- a replica circuit connected to the first node of the current comparator, the output terminal of the amplifier;
- and the driver;
- wherein the replica circuit is configured to have a second current that is proportional to the first current.
A driver calibration circuit, comprising:
- a current comparator configured to generate a threshold current and comprising a first node and a second node;
- a controller connected to the second node of the current comparator;
- a digital-to-analog converter (DAC) connected to an output terminal of the controller;
- an amplifier connected to an output terminal of the DAC;
- a driver connected to an output terminal of the amplifier and configured to have a first current;
- and
- a replica circuit connected to the first node of the current comparator, the output terminal of the amplifier, and the driver;
- wherein the replica circuit is configured to have a second current that is directly proportional to the first current.
Dependencies are inferred from the claim text.