Realtek Semiconductor Inc.

Gen-Sheng Ran

Ka-Un Chan

Po-Chih Wang

A power amplifier includes a power switching circuit, a driver circuit, and an amplifier circuit. The power switching circuit is configured to receive a first voltage and a second voltage, and provide the first voltage or the second voltage according to an operation mode of the power amplifier. The driver circuit is coupled to the power switching circuit. The driver circuit is configured to operate according to the first voltage or the second voltage and generate a driving signal according to an input signal. The amplifier circuit is coupled to the power switching circuit and the driver circuit. The amplifier circuit is configured to operate according to the first voltage or the second voltage and generate an output signal according to the driving signal.

Power amplifier and power amplifying method

A triple cascode power amplifier is provided. The triple cascode power amplifier includes a first-stage transistor pair, a second-stage transistor pair and a third-stage transistor pair. The first-stage transistor pair comprises two first-stage transistors that respectively receive two dynamic bias voltages with opposite polarities. The second-stage transistor pair is coupled with the first-stage transistor pair to form a first node and comprise two second-stage transistors coupled with each other to form a second node. The third-stage transistor pair is coupled with the second-stage transistor pair and comprises two third-stage transistors for outputting a differential signal. The first-stage transistor pair and the second-stage transistor pair are low voltage components while the third-stage transistor pair is a high voltage component. The power amplifier transforms the differential signal into a single-ended signal for output.

Growing community of inventors

Hsinchu, Taiwan

Gen-Sheng Ran