Question: Acommercial wideband monolithic feedback amplifier (the 733) is shown in Fig. 8.51. This consists of a local series-feedback stage feeding a two-stage shunt-shunt feedback amplifier.

Acommercial wideband monolithic feedback amplifier (the 733) is shown in Fig. 8.51. This consists of a local series-feedback stage feeding a two-stage shunt-shunt feedback amplifier. The current output of the input stage acts as a current drive to the shunt-shunt output stage.

(a) Assuming all device areas are equal, calculate the collector bias current in each device.

(b) Calculate input impedance, output impedance, and overall gain Ï…_o/Ï…_i for this circuit at low frequencies with R_L = 2 kÎ©. Also calculate the loop gain of the output stage.

Data: Î² = 100, r_b = 0, r_o = ˆž.

Fig. 8.51:

+6 V 1.1 k2 1.1 k2 2.4 k2 2.4 k2 ОБ 10 ka Q3 Q4 Q2 7 k2 640 2 640 2 RL = 2 k2 7 k2 Ов Q10 :300 2 1.4 k2 400 2 400 2

+6 V 1.1 k2 1.1 k2 2.4 k2 2.4 k2 10 ka Q3 Q4 Q2 7 k2 640 2 640 2 RL = 2 k2 7 k2 Q10 :300 2 1.4 k2 400 2 400 2 300 2 -6 V

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