Chegg Solutions for Microelectronic Circuits (Adel S Sedra, Kenneth C Smith) (Z-Library)_parte_1238

Prévia do material em texto

Step of 6 11.009P Consider the Figure P11.9 in the textbook. The equivalent circuit diagram is shown in Figure 1. r. + V. V. + MV, - R2 Figure 1 Step of 6 The loading effect of the feedback network at the input side is can be obtained by short-circuiting at output side and looking into input side. Then, the resultant resistance is The loading effect of the feedback network at the output side is can be obtained by open- circuiting at input side and looking into output side. Then, the resultant resistance is +R2 The equivalent circuit diagram is shown in Figure 2. r. + + + - - Figure 2 Step of 6 Determine the value of open loop gain A Open loop gain A is defined as, V. It can be also written as follows: (1) Calculate the ratio of V from the Figure 2. Apply Voltage division rule at output. (2) Step of 6 Calculate the ratio of from the Figure 2. Apply Voltage division rule at output. R (3) Step of 6 Substitute the equatin 2 and 3 in equation 1. A = = Thus, the open loop gain A is obtained as, The feedback factor is obtained from the feedback network. Step of 6 Determine the loop gain AB Substitute for A and for in equation. = Consider the resistance R₁ is greater than R2 Thus, = Therefore, the loop gain is