Solid state power amplifier and its applications

　　RF power amplifier

　　Wireless transmission requires modulated waves to be transmitted over long distances through the air. Use an antenna to send signals, and the transmission range depends on the power of the signal fed to the antenna. For wireless transmissions such as FM radio, antennas require signals with an input power of several kilowatts. Here, the RF power amplifier is used to increase the power amplitude of the modulated wave to a level sufficient to achieve the desired transmission distance.

　　The microwave millimeter wave high-power amplifier commonly heard in daily life is a high-end testing instrument, which has been widely used in various fields such as electromagnetic compatibility (EMC) testing, 5G communication testing, electronic countermeasures and interference, specific electromagnetic environment simulation, and aerospace. As a radio frequency microwave power amplifier, it has gone through the era of electronic tubes, the era of traveling wave tubes (TWT), and now it has entered the era of solid-state amplifiers using semiconductors as the core. High power solid-state amplifiers have occupied frequency bands that are not too high.

　　Introduction to Solid State Power Amplifier

　　Solid state power amplifiers have the advantages of small size, low operating voltage, long lifespan, high efficiency, and high reliability. They have been widely used in RF/microwave/millimeter wave systems such as radar, mobile communication, interference, and identification, and occupy a very important position.

　　In simple terms, a solid-state power amplifier is a module that integrates and packages circuits with amplification capabilities to amplify signals.

　　There are various types of solid-state power amplifiers, such as audio solid-state amplifiers and microwave signal solid-state amplifiers. Their characteristic is that they are easy to use, only need to provide the module with working power, input signals that meet the requirements, connect the output, and it can work normally.

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