Himax Technologies, Inc.

Ping-Liang Chen

Chun-Yu Liu

Chao-Liang Chien

Shih-Yi Tang

An operational amplifier includes a first output transistor and a second output transistor connected in series between two power nodes, the second output transistor having a semiconductor type opposite to the first output transistor, the first output transistor and the second output transistor being electrically coupled at an output node, and gates of the first output transistor and the second output transistor being connected to a first drive node and a second drive node respectively; and a decoupling capacitor circuit electrically connected between the first drive node and the second drive node.

Operational amplifier

A capacitor includes a first transistor, a second transistor, and a control circuit. The first terminal of the first transistor is coupled to the first terminal of the capacitor. The first terminal of the second transistor is coupled to the second terminal of the capacitor. In a normal mode, the control circuit turns on the first transistor and the second transistor, the second terminal of the second transistor is coupled to the control terminal of the first transistor through the control circuit, and the control terminal of the second transistor is coupled to the second terminal of the first transistor through the control circuit. In a power saving mode, the control circuit turns off the first transistor and the second transistor.

Capacitor

The present invention provides a voltage level shifter architecture applicable for positive and negative voltage shifting, in which a shielding circuit is configured to relax the voltage stress of the transistors in the input stage circuit, and a switching circuit is configured to avoid current leakage. In addition, designing the power domain(s) of the n-well P-type transistors in the voltage-level shifter makes the voltage-level shifter area-efficient and power-efficient or design-flexible and application-adaptive.

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Tainan, Taiwan

Ping-Liang Chen