Postech Foundation

Pohang University of Science and Technology Foundation

Jeonghyeon Cha

Bumman Kim

Youngoo Yang

Jangheon Kim

Ildu Kim

A power amplifying apparatus includes a Doherty amplifier having a carrier amplifier and a peaking amplifier connected in parallel, each having an input/output matching circuit and an asymmetric power driver for driving the carrier amplifier and the peaking amplifier using an asymmetric power driver.

Power amplifying apparatus using asymmetric power drive

A microwave Doherty amplifier employs a way-extension in which N ways (N&#x2267;2, N is a natural number) are established, and envelope tracking for high efficiency and linearity of the power amplifier of a mobile communications base station or of a handset with improved reliability. The Doherty amplifier includes N ways, where N&#x2267;2 and N is a natural number; a carrier amplifier which is placed on one of the N ways; peak amplifiers which are placed on respective ways of the (N&#x2212;1) ways excluding the way on which the carrier amplifier is placed; a power distribution unit which distributes power to each of the N ways; and a quarter wave impedance transformer at which the N ways meet.

Growing community of inventors

Kyungsangbuk-do, South Korea

Jeonghyeon Cha