The 741 op amp schematic is shown below. What is the function of the following t

Question

The 741 op amp schematic is shown below. What is the function of the following transistors? a) Q_1 - Q_4 (i) differential CE input followed by CC buffer (ii) differential CE-CB cascode input stage (iii) differential CB-CC cascade input stage (iv) differential CC-CB cascade input stage b) Q_5 - Q_7 (i) buffered current mirror active load for differential input stage (ii) buffered current source bias for differential input stage (iii) Wilson current mirror active load for differential input stage (iv) Widlar current mirror active load for differential input stage c) Q_11 and Q-12 (i) Q_12 is a CE gain stage and Q_11 is a CC buffer (ii) Q_11 and Q_12 are CE gain stages (iii) Q_11 is a CE gain stage and Q_12 is a CC buffer (iv) Q_11 is a CE gain stage and Q_12 is a diode-connected transistor to adjust the DC level

Explanation / Answer

a)differential CC-CB cascade input stage

b)wilson current mirror active load for differential input stage

c)Q12 is CE stage and Q11 is CC buffer stage

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