A two-port network has the ABCD parameters \(\left[ {\begin{array}{*{20}{c}} 7&8\\ 3&4 \end{array}} \right]\). Two such identical networks are cascaded. The ABCD parameters of the overall cascaded network will be

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  1. \(\left[ {\begin{array}{*{20}{c}} 14&16\\ 6&8 \end{array}} \right]\)
  2. \(\left[ {\begin{array}{*{20}{c}} 73&88\\ 33&40 \end{array}} \right]\)
  3. \(\left[ {\begin{array}{*{20}{c}} 1&1\\ 1&1 \end{array}} \right]\)
  4. \(\left[ {\begin{array}{*{20}{c}} 49&64\\ 9&16 \end{array}} \right]\)

Answer (Detailed Solution Below)

Option 2 : \(\left[ {\begin{array}{*{20}{c}} 73&88\\ 33&40 \end{array}} \right]\)
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Detailed Solution

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Concept:

In cascaded connection transmission parameters get multiplied. 

Calculation:

\(\left[ {\begin{array}{*{20}{c}} A&B\\ C&D \end{array}} \right] = \left[ {\begin{array}{*{20}{c}} {{A_1}}&{{B_1}}\\ {{C_1}}&{{D_1}} \end{array}} \right]\left[ {\begin{array}{*{20}{c}} {{A_2}}&{{B_2}}\\ {{C_2}}&{{D_2}} \end{array}} \right]\)

\( = \left[ {\begin{array}{*{20}{c}} 7&8\\ 3&4 \end{array}} \right]\left[ {\begin{array}{*{20}{c}} 7&8\\ 3&4 \end{array}} \right]\)

\( = \left[ {\begin{array}{*{20}{c}} {73}&{88}\\ {33}&{40} \end{array}} \right]\)

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