Microwave amplifier
Radio frequency and microwave communication systems are known to place ever-increasing demands on the linearity and efficiency of power amplifiers. Microwave amplifiers, such as solid-state power amplifiers and traveling wave tube amplifiers, are widely used in communication systems for transmitting analog or digital data. In a satellite communication system, communication is performed by using a microwave (ultra-high frequency wave) modulated by an input signal having a comparatively low frequency. The transmitter of such a communication system employs a microwave amplifier using an active element, e.g., an FET (Field Effect Transistor), in order to amplify the microwave signal with a high gain. Broadband low noise direct-coupled microwave amplifiers are increasingly being required to serve the needs for a variety of modern electronic applications which operate over a wide frequency range extending from DC to microwave frequencies. Some applications include instrumentation systems, radio and cellular phone systems, personal communication networks (PCN), high definition television (HDTV), cable television (CATV), optical communications, and global positioning satellite (GPS) systems. A typical application of the microwave amplifier is a power control for a transmitter incorporated in a cellular phone. The output power of the wireless telephone is controlled by using the microwave amplifier, and a field effect transistor is the essential circuit component of the prior art microwave amplifier circuit. A microwave amplifier has a field effect transistor such as a compound semiconductor field effect transistor which is superior in high speed and high frequency performances, for example, a GaAs field effect transistor.
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