Highly linear RF amplifier design: theoretical analysis and experimental study

Abstract

In this article, a high frequency amplifier design method based on the negative impedance compensation has been demonstrated analytically and experimentally. An effective nonlinear model has been used to simulate the harmonic distortion and intermodulation distortion factors in amplifier design. The simulation and measurement results show that, with this proposed technique, high linearity and high gain accuracy can be achieved. The proposed method is particularly suitable for linearisation of RF/microwave amplifiers with low open-loop gain.

Linearization of High frequency Class E Feedback Amplifier using Negative Impedance Method

“…Later on, M.T. Ali et al in [10] modeled his negative feedback amplifier with negative impedance linearization using the Volterra series. Again, in [12] R. Wu describes the linearization scheme using the close loop differential amplifier shown below in fig 6.…”

“…Moreover, P Sampath et al in [9], designed an analog pre-distortion with the help of the square law method. In this work, another modern approach was utilized which known negative impedance method developed by M.T.Ali et al shown from [10] to [12] where an adjustment current is introduced at the input side of a differential amplifier which helps to increase its linearity. The novelty of this work is the application of this method on a highly nonlinear class E switch-mode power amplifier and observe its linearity as well as other performance parameters.…”

Linear modeling and regression for exponential engineering functions by a generalized ordinary least squares method

“…Naudot and Yang [13] studied normalization and quasi-linearization of a family of germs of hyperbolic vector fields at the origin. Ali et al [14] design and linearize concurrent dual-band doherty power amplifier with frequency-dependent power ranges. Chubich and Chernikova [15] studied Gaussian nonlinear discrete systems based on the time domain linearization and optimal control.…”

Stability analysis and stabilisation of an amplifier with non-linearity compensation

“…Several researchers have reported their work on the stability analysis of RF amplifier with traditional envelope feedback and Cartesian feedback (Kheirkhahi et al 2011 andDowson et al 2004). In this paper, the stability of the amplifier with the negative impedance compensation reported in (Wu et al 2007, Wu et al 2010and Ali et al 2014) is investigated by using effective stability analysis methods such as the Routh-Hurwitz criterion (Surhone et al 2010 andJagan 2008). The certain region to guarantee the stability of the amplifier can be determined by using additional capacitance compensation, which provides improved flexibility for the amplifier design.…”

“…, special transistor combination and arrangement (Kim et al 2000;Yum et al 2006;Kang et al 2006 andNakatsugawa 2001), signal-injection (Cheng et al 2003 andMizusawa et al 2005), compensation using auxiliary amplifier (Liang et al 2005, Zhang 2011Wu et al 2007, Wu et al 2010and Ali et al 2014) have been reported.…”