9780199339136, Chapter 1, Problem 79P

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Chapter Problem 79P Step solution Step Refer Table the textbook for the equivalent of amplifier Consider that the amplifier circuit is fed with voltage having source resistance ot connected to load consisting of a resistance with C, Draw circuit diagram + V. Figure 1 Step (a) Apply voltage division method to determine the input voltage the circuit Consider that x% of the input signal lost coupling the signal source the Equate expressions R 100 100 Step Simplify equation further 100 R. R, 100 100 100 100 100 Step Simplify equation further 100 100-x 100 100 the required constraint satisfied for the condition Step (b) Consider the following expression for the 3-dB frequency of the parallel RC the output circuit f. Consider that the 3-dB frequency is greater than or equal the specified value the required constraint satisfied for the condition Step (c) Write expression for the gain of the amplifier = Consider that the dc gain equal greater than specified Substitute the expression of in the equation from part (a) since, 100 100 the required constraint satisfied for the condition Step Determine the input resistance 100 Substitute for and 10% for in the equation 100 Therefore the value nput resistance Step of 9 Determine output resistance Substitute for 2 MHz for and for the value output resistance Step Determine the transconductance 100 Substitute 100 V/V for for and 10% for (100) 10 100 100 0.9 100 mA/V Therefore the value of transconductance 27.925 mA/V