(a) Using the small-signal equivalent circuit in Figure 12.25 for the circuit in Figure 12.24(a), derive the expression for the small-signal current gain \(A_{i f}=I_{o} / I_{s}\).

(b) Using the circuit parameters given in Figure 12.24

(a) and assuming transistor parameters \(h_{F E}=100\) and \(V_{A}=\infty\), calculate the value of \(A_{i f}\). Compare this answer with the results of Example 12.9.

Data From Example 12.9:-

Figure 12.24(a):-

Figure 12.25:-

Transcribed Image Text:

Determine the closed-loop current gain and input resistance of a discrete shunt-series transistor feedback circuit. = 100 Consider the circuit in Figure 12.24(a), with transistor parameters hFE and VA = . Assume the source resistance is Rs = 10 MS2. The capacitors are large enough to act as short circuits to the signal currents.