Amplifiers are essential for the correct operation of all communication systems. In addition to the requirements for their linear operation, there is also a requirement for efficiency. Usually, efficient amplifiers are not necessarily linear and the process of linearization is usually performed using a Digital Pre-Distorter (DPD) on an efficient amplifier, which distorts the input signal in a specific way to yield a linear output. There are several amplifier efficiency enhancement techniques, however, the Doherty amplifier, introduced in 1936 [1], has been the mainstay in the telecommunications industry due to its inherent simplicity and efficiency.
My work on amplifiers goes all the way back to 2002. My work on amplifiers included discrete transistor characterisation (Volterra and Taylor series), design of Low Noise Amplifiers (LNAs) and the design efficiency enhancement amplifiers, such as Doherty amplifiers.
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