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Nt1310 Unit 1 Lab Report

Satisfactory Essays

Figure~\vref{fig:res}, shows the characteristic functions of the classes of the linear power amplifiers in which the active device operates as a current source. Its major disadvantage is holding a voltage to the transistor terminals during the conductance of the current, resulting in power dissipation. As shown, classes A and B are linear, while class C is incapable of storing amplitude information, hence often not be considered one of these classes. \begin{figure}[H] \centering \includegraphics[width=0.75\columnwidth]{resumee} \caption{Bias of class A, AB, B and C.} \label{fig:res} \end{figure} \begin{table}[H] \centering \caption{Summary of maximum values for each PA's Not-switched class} \label{tab: tab1} \resizebox{\textwidth}{!}{% …show more content…

\begin{tabular}{|c|c|c|c|c|} \hline \textbf{PA Class} & \textbf{A} & \textbf{B} & \textbf{AB} & \textbf{C} \\ \hline $\boldsymbol{\theta}$ & $2\theta = 2\pi$ & $2\theta = \pi$ & $\pi\leqslant 2\theta \leqslant 2\pi$ & $0\leqslant 2\theta \leqslant \pi$ \\ \hline $\boldsymbol{P_{DC,max}}$ & $\frac{V_{DD}^{2}}{R_{opt}}$ & $\frac{2V_{DD}^{2}}{\pi R_{opt}}$& $\frac{V_{DD}.I_{rf}}{\pi}.[sin\theta - \theta cos\theta]$ & $\frac{V_{DD}.I_{rf}}{\pi}.[sin\theta - \theta cos\theta]$ \\ \hline $\boldsymbol{P_{out,max}}$ & $\frac{V_{DD}^{2}}{2R_{opt}}$ & $\frac{V_{DD}^{2}}{2R_{opt}}$ & $\frac{V_{DD}^{2}}{2R_{opt}}$ & $\frac{V_{DD}^{2}}{2R_{opt}}$ \\ \hline $\boldsymbol{\eta_{max}}$ & 50\% & 78.5\% & $50\% < \eta <78.5\%$ & 94\% \\ \hline \textbf{Linearity} & Excellent & Good & Very Good & Bad \\

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