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The linearization approach that exploits the modified baseband signal is applied in this paper to linearize a two-way broadband Doherty power amplifier. The required linearization signal formed as a product of the second-order nonlinearity of a nonlinear system is adequately processed in amplitude and phase in the digital domain. Then, the fundamental carrier second harmonic is modulated by the tuned...
In this paper a broadband RF power amplifier operating at frequency range 0.75 GHz to 1.25 GHz is linearized by the even-order nonlinear signals at frequencies around the second harmonics that are inserted at the amplifier transistor gate and drain throughout the broadband matching circuits that provide high amplifier efficiency as well as adequate power level of the injected signal for the linearization...
This paper presents the linearization technique for RF power amplifiers that uses the modified baseband signals. The signal for linearization is formed in baseband, digitally processed by adjusting the amplitude and polarity and injected at the input and output of the amplifier transistor across the DC bias circuits. The modified baseband signal is one of the products of the second order nonlinearity...
A novel linearization technique for RF power amplifiers is presented in this paper. The proposed technique uses the modified baseband signal that modulates the fundamental carrier second harmonic. This additional signal processed for linearization is then injected, together with the fundamental useful signal, at the input of the amplifier transistor. Also, a prepared signal for linearization is inserted...
The linearization of broadband two-way Doherty amplifier for application in the frequency range 0.85–1.15GHz is considered in this paper. The carrier and peaking amplifiers in Doherty configuration comprise Freescale's transistor MRF281S LDMOSFET characterized by the maximum output power 4W and the broadband lumped element matching circuits. The linearization of the amplifier is carried out by the...
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