Dialog Semiconductor Gmbh

Dialog Integrated Circuits (Tianjin) Limited

Iwatt Integrated Circuits Technology (Tianjin) Limited

Weihai Huang

Jianming Yao

John William Kesterson

Fuqiang Shi

Yong Li

Honglai Wang

A device for determining impedance at a data pin of a communication interface. In one embodiment, the device includes a current source configured to selectively inject a test current to the data pin. The device also includes a sensing circuit for sensing a first test voltage corresponding to a voltage at the data pin without the test current injected, and a second test voltage corresponding to another voltage at the data pin with the test current injected. The sensing circuit determines the impedance at the data pin based on the first test voltage and the second test voltage.

USB data pin impedance detection

A switching power converter is provided that transitions between output voltage modes over a delay period using at least one of an adaptive resistor and an adaptive reference voltage circuit.

Power converters with adaptive output voltages

Various embodiments of the present invention relate to a reference voltage generator circuit. Specifically, the circuit may for example comprise: a mirror constant current source having a first branch and a second branch, wherein a first current on the first branch is proportional to a second current on the second branch; wherein the first branch has a first resistive element, and the second branch has two second resistive elements connected in series; and a power supply terminal located between said two second resistive elements on the second branch. A high-precision reference voltage relative to the voltage source can be provided at the power supply terminal by using the circuit provided by various embodiments of the present invention.

Reference voltage generator circuits and integrated circuits having the same reference voltage generator circuits

Growing community of inventors

Tianjin, China

Weihai Huang