RF power transistor
Radio frequency (RF) power transistors are commonly used in amplification stages for radio base station amplifiers. A radio frequency (RF) amplifier is incorporated in a wireless device to transmit the information. The radio frequency amplifier is connected to an antenna to disperse the signal in a directional or non-directional pattern depending on the application. Power transistors are designed to deliver high output power and high gain. A power transistor typically comprises a plurality of transistor cells or unit elements in a semiconductor die with the cells connected in parallel for amplifying an input signal. Power transistors for RF and Microwave frequencies are made of multiple building blocks or individual transistors which are driven in parallel with the outputs of the transistors combined as the power output. Radio frequency (RF) power transistors are used for mobile communication devices in the frequency range from 900 MHz to 2 GHz.
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