Mediatek Corporation

Chun-Chih Hou

Wei-Hsuan Tu

Yin-Chao Huang

Power-on reset circuits are disclosed. A first reset circuit includes a first comparator to output a system reset signal, and a second reset circuit outputs a first reset signal to control operations of the first comparator, such that the first reset circuit outputs the system reset signal when a first voltage is less than a first reference voltage.

Power-on reset circuits

An amplifying system includes an amplifier operated according to a supply voltage, and a detector coupled to the amplifier for generating a first control signal to the amplifier to disable an output stage of the amplifier when the supply voltage reaches a threshold.

Amplifying system and related method

Variable gain amplifiers with wider linear range are provided, in which first and second loads are coupled to a power voltage, and a transconductor cell comprises first and second transistors, a gain control transistor, and first and second current sources. The first and second transistors comprise control terminals receiving a set of input signals, first terminals coupled to the first and second loads respectively, and second terminal coupled to first and second nodes respectively. The first and second current sources are coupled between the first node and a first voltage and between the second node and the first voltage respectively. The first gain control transistor is coupled between the first node and second node, receiving a gain control voltage, in which the grain control transistor has a threshold voltage lower than that of the first and second transistors.

Growing community of inventors

Tainan County, Taiwan

Chun-Chih Hou