High power LDMOS (Laterally Diffused MOS) transistor.High power GaN (Gallium Nitride) transistor.High power MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor).Some possible synonyms for high power RF transistor might include: In industrial heating systems, high power RF transistors are used to generate the high frequency electromagnetic energy that is used to heat materials. In radar systems, high power RF transistors are used to generate the high frequency carrier signal that is used to detect objects in the environment. One of the most common uses is in broadcast transmitters, where they are used to amplify the radio signal before it is broadcast. High power RF transistors are used in a variety of applications. These transistors are used in applications that require high levels of RF power, such as in broadcast transmitters, radar systems, and industrial heating systems. It can easily be shown that at high frequency, electrical energy can be radiated into space.A high power RF transistor is a type of RF transistor that is designed to handle high output power levels, typically above 1 watt. It may be emphasised here that radio waves are sent without employing any wire. These are similar to light and heat waves except that they have longer wavelengths. Radio waves are electromagnetic waves and possess the same general properties. These radio waves travel with the velocity of light 3x10 m/sec. The transmitting antenna radiates the radio waves in space in all directions. The radio waves from the transmitter are fed to the transmitting antenna or aerial from where these are radiated into space. As the carrier frequency is very high, therefore, the audio signal can be transmitted over large distances. The process of modulation permits the transmission of the audio signal at the carrier frequency. The resultant waves are called modulated waves or radio waves and the process is called modulation. Here, the audio signal is superimposed on the carrier wave suitably. The amplified audio signal and carrier waves are fed to the modulator. Such high power is necessary for transmitting the signal to the required distances. The power level of the carrier wave is raised to a sufficient level by radiofrequency amplifier stages Most broadcasting stations have carrier wave power of several kilowatts. Usually, a crystal oscillator is used for this purpose. The function of an oscillator is to produce a high-frequency signal, called a carrier wave.
The amplified output from the last audio amplifier is fed to the modulator for rendering the process of modulation. This job is accomplished by cascaded audio amplifiers.
The audio signal from the microphone is quite weak and requires amplification.
The output of the microphone is fed to a multistage amplifier. When the speaker speaks or a musical instrument is played, the varying air pressure generates an audio electrical signal corresponding in frequency to the original signal. The important elements of transmitters are as follows:Ī microphone is a device that converts sound waves into electrical waves. Transmitter: The transmitter is an extremely important device, its purpose is to produce radio frequency waves for transmission into space.
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