Transformer coupled(Class A power amplifier)
Instead of resistive coupling transformer coupling is used
\( R^{,}_{L}=(\frac{N_1}{N_2})^2R_L\)
\( N_2=2N_1\)
\(\frac{N_1}{N_2}=\frac{V_1}{V_2}\) =>
\( V_2=2V_1\)
\( R^{,}_{L}\) is the resistance reflected to \(1°\) winding.It acts like \(R_c\) in series fed class A
\( V_{pp}=2V_{cc}\)
\( I_{pp}=\frac{2V_{cc}}{R^{,}_{L}}\)
\( I_c=\frac{V_{cc}}{R^{,}_{L}}\)
\(η =\frac{V_{pp}I_{pp}}{8V_{cc}I_c}\)
\(=\frac{2V_{cc}\frac{2V_{cc}}{R^{,}_{L}}}{8V_{cc}\frac{V_{cc}}{R^{,}_{L}}}=\frac{1}{2}\)=50%MathJax example
Instead of resistive coupling transformer coupling is used
\( R^{,}_{L}=(\frac{N_1}{N_2})^2R_L\)
\( N_2=2N_1\)
\(\frac{N_1}{N_2}=\frac{V_1}{V_2}\) =>
\( V_2=2V_1\)
\( R^{,}_{L}\) is the resistance reflected to \(1°\) winding.It acts like \(R_c\) in series fed class A
\( V_{pp}=2V_{cc}\)
\( I_{pp}=\frac{2V_{cc}}{R^{,}_{L}}\)
\( I_c=\frac{V_{cc}}{R^{,}_{L}}\)
\(η =\frac{V_{pp}I_{pp}}{8V_{cc}I_c}\)
\(=\frac{2V_{cc}\frac{2V_{cc}}{R^{,}_{L}}}{8V_{cc}\frac{V_{cc}}{R^{,}_{L}}}=\frac{1}{2}\)=50%
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