US 2026/0149458 A1Published application

Digital to analog converter

AssigneesGlobal Unichip Corporation, Taiwan Semiconductor Manufacturing Company, Ltd.

InventorsTing-Hao WANG, Hui-Wen TSAI

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Abstract

A digital to analog converter includes multiple switching current cells, an offset current cell, and a first amplifier. Each of the switching current cells includes a first differential switch pair, a first stack transistor and a first current source transistor. The first differential switch pair is controlled by a first control signal and a first inverted control signal. The first stack transistor and the first current source transistor are coupled in series and are coupled to the first differential switch pair. The offset current cell includes a second stack transistor. An input terminal of the first amplifier is coupled to a source of the second stack transistor. An output terminal of the first amplifier is coupled to each of a gate of the second stack transistor and a gate of the first stack transistor.

Claims20

Dependent claims

A digital to analog converter, comprising:

a plurality of switching current cells, each of the plurality of switching current cells comprising:
a first differential switch pair controlled by a first control signal and a first inverted control signal;
and
a first stack transistor and a first current source transistor coupled in series with each other and coupled to the first differential switch pair;
an offset current cell, comprising:
a second differential switch pair controlled by a second control signal;
and
a second stack transistor and a second current source transistor coupled in series with each other and coupled to the second differential switch pair, wherein a gate of the second current source transistor is coupled to a gate of the first current source transistor;
a first amplifier circuit, an input terminal of the first amplifier circuit being coupled to a source of the second stack transistor, and an output terminal of the first amplifier circuit being coupled to each of a gate of the second stack transistor and a gate of the first stack transistor;
and
a current source circuit coupled to the second current source transistor to form a current mirror, and coupled to the first current source transistor to form a current mirror.

8 more elements

An operation method of a digital to analog converter, comprising:

controlling a first differential switch pair controlled by a first control signal and a first inverted control signal, wherein a first stack transistor and a first current source transistor are coupled in series with each other and coupled to the first differential switch pair;
and
controlling a second differential switch pair controlled by a second control signal, wherein a second stack transistor and a second current source transistor are coupled in series with each other and coupled to the second differential switch pair, and a gate of the second current source transistor is coupled to a gate of the first current source transistor,
wherein an input terminal of a first amplifier circuit is coupled to a source of the second stack transistor, and an output terminal of the first amplifier circuit is coupled to each of a gate of the second stack transistor and a gate of the first stack transistor, and
a current source circuit is coupled to the second current source transistor to form a current mirror, and is coupled to the first current source transistor to form a current mirror.

2 more elements

Dependencies are inferred from the claim text.