*28. For the network of Fig. 5.166, determine A,. 8 V 3.6 k2 +6 V -10 V B=75 Sos=5 us 6.8 k2 4.7 k2 oV, 3.9 k2 a = 0.998 8os = 10 us -5 V FIG. 5.165 FIG. 5.166 Problem 27. Problem 28. 5.10 Collector...

Extracted text: *28. For the network of Fig. 5.166, determine A,. 8 V 3.6 k2 +6 V -10 V B=75 Sos=5 us 6.8 k2 4.7 k2 oV, 3.9 k2 a = 0.998 8os = 10 us -5 V FIG. 5.165 FIG. 5.166 Problem 27. Problem 28. 5.10 Collector Feedback Configuration 29. For the collector feedback configuration of Fig. 5.167: a. Determine re. b. Find Z; and Z. c. Calculate A. *30. Given r. = 10 2, B = 200, A, = -160, and A; = 19 for the network of Fig. 5.168, deter- mine Rc, RF, and Vcc- *31. For the network of Fig. 5.49: a. Derive the approximate equation for A,. b. Derive the approximate equations for Z; and Zp. c. Given Rc = 2.2 k2, RF = 120 k2, RE = 1.2 k2, B = 90, and Vcc = 10 V, calculate the magnitudes of A, Zj, and Z, using the equations of parts (a) and (b). 12 V Vcc 3.9 k2 RC 220 k2 Rp -o V. r, = 10 2 V V, oA B= 200 B= 120 To= 40 k2 r.= 80 k2 FIG. 5.167 FIG. 5.168 Problem 29. Problem 30.