US 11,385,668 B2Granted

Configurable offset compensation device

AssigneeRealtek Semiconductor Corp.

InventorsTing-Yao Huang, Po-Chih Wang, Ka-Un Chan

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Abstract

An offset compensation device includes a first bias module and a second bias module. The first bias module includes a plurality of first current control circuits and a plurality of second current control circuits coupled in parallel. Each of the first current control circuits generates a first reference current, and each of the second current control circuits generates a second reference current. The second bias module includes a plurality of third current control circuits and a plurality of fourth current control circuits coupled in parallel. Each of the third current control circuits generates a third reference current, and each of the fourth current control circuits generates a fourth reference current. The second reference current is greater than the first reference current, and the fourth reference current is greater than the third reference current.

Claims14

Dependent claims

An offset compensation device comprising:

a first bias module coupled to a first bias node and comprising:
a plurality of first current control circuits each configured to generate a first reference current;
and
a plurality of second current control circuits each configured to generate a second reference current;
and
a second bias module coupled to a second bias node and comprising:
a plurality of third current control circuits each configured to generate a third reference current;
and
a plurality of fourth current control circuits each configured to generate a fourth reference current;
wherein:
the plurality of first current control circuits and the plurality of second current control circuits are coupled in parallel and coupled to the first bias node;
the plurality of third current control circuits and the plurality of fourth current control circuits are coupled in parallel and coupled to the second bias node;
the second reference current is greater than the first reference current, and the fourth reference current is greater than the third reference current;
when a second current control circuit of the plurality of second current control circuits is enabled, the plurality of fourth current control circuits are disabled;
and
when a fourth current control circuit of the plurality of fourth current control circuits is enabled, the plurality of second current control circuits are disabled.

13 more elements

A method for operating an offset compensation device, the offset compensation device comprising a first bias module and a second bias module, the first bias module comprising a plurality of first current control circuits and a plurality of second current control circuits, the second bias module comprising a plurality of third current control circuits and a plurality of fourth current control circuits, the plurality of first current control circuits and the plurality of second current control circuits being coupled in parallel and coupled to a first bias node, and the plurality of third current control circuits and the plurality of fourth current control circuits being coupled in parallel and coupled to a second bias node, and the method comprising:

enabling a first number of second current control circuits or the first number of fourth current control circuits according to an offset value for making a preliminary compensation to the offset value;
and
enabling a second number of first current control circuits or the second number of third current control circuits according to the offset value after the preliminary compensation is made for making a further compensation to the offset value;
wherein:
a second reference current generated by each of the second current control circuits is greater than a first reference current generated by each of the first current control circuits, and a fourth reference current generated by each of the fourth current control circuits is greater than a third reference current generated by each of the third current control circuits;
when a second current control circuit of the plurality of second current control circuits is enabled, the plurality of fourth current control circuits are disabled;
and
when a fourth current control circuit of the plurality of fourth current control circuits is enabled, the plurality of second current control circuits are disabled.

5 more elements

Dependencies are inferred from the claim text.