*9.119 Figure P9.119 shows a bipolar op-amp circuit that resembles the CMOS op amp of Fig. 9.40….

*9.119 Figure P9.119 shows a bipolar op-amp circuit that resembles the CMOS op amp of Fig. 9.40. Here, the input differential pair Q1:

Q2:

is loaded in a current mirror formed by Q3:

and Q4:

 The second stage is formed by the current-source-loaded common-emitter transistor Q5:

 Unlike the CMOS circuit, here there is an output stage formed by the emitter follower Q6:

 The function of capacitor CC will be explained later, in Chapter 11. All transistors have β = 100, / VBE / = 0.7 V, and roro =∞.

 

For inputs grounded and output held at 0 V (by negative feedback, not shown) find the emitter currents of all transistors. (b) Calculate the gain of the amplifier with RL =1 kΩ

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