Industrial Technology Research Institute

Yu-Cheng Hsu

Shih-Ming Wang

Cheng-Chung Chen

Yu-Teng Chang

Chung-Chi Lai

De-Cheng Chang

A switching circuit and a method of providing the switching circuit are provided. The switching circuit includes a first transmission amplifier, a second transmission amplifier, a third transmission amplifier, and a fourth transmission amplifier. The first transmission amplifier amplifies a first signal at a first connection port and transmits the first signal to a second connection port in a first mode. The second transmission amplifier amplifies a second signal at a third connection port and transmits the second signal to a fourth connection port in the first mode. The third transmission amplifier amplifies the first signal at the first connection port and transmits the first signal to the fourth connection port in the second mode. The fourth transmission amplifier amplifies the second signal at the third connection port and transmits the second signal to the second connection port in the second mode.

Switching circuit and method of providing switching circuit

An adaptive bias power amplifier including an amplifier, a signal coupler, a power detector and a bias control circuit is provided. The signal coupler is connected to an input terminal of the amplifier. The power detector is connected to the signal coupler, and detects an input power of the amplifier via the signal coupler. The bias control circuit is connected to an output terminal of the power detector and the input terminal of the amplifier. The bias control circuit adjusts a gate bias of the amplifier in accordance with a detecting result of the power detector.

Power amplifier

A multi-frequency and multi-mode power amplifier is provided. The amplifier has a carrier power amplifier and a peaking power amplifier. The carrier power amplifier receives a first signal and outputs a first amplified signal, in which a first transistor size adjusting unit is included to adjust an equivalent transistor size based on a mode indication signal. The peaking power amplifier receives a second signal and outputs a second amplified signal, in which a second transistor size adjusting unit is included to adjust an equivalent transistor size based on the mode indication signal.

Growing community of inventors

Hsinchu County, Taiwan

Yu-Cheng Hsu