The 741 op amp schematic is shown below. What is the function of the following t
ID: 2084335 • Letter: T
Question
The 741 op amp schematic is shown below. What is the function of the following transistors? a) Q_1-Q_4 differential CE input followed by CC buffer differential CE-CB cascode input stage differential CB-CC cascade input stage differential CO-CB cascade input stage Q_5-Q_7 buffered current mirror active load for differential input stage buffered current source bias for differential input stage Wilson current mirror active load for differential input stage Widlar current mirror active load for differential input stage Q_11-Q_12 Q_12 is a CE gain stage and Q_11 is a CC buffer Q_11 and Q_12 are CE gain stages Q_11 is a CE gain stage and Q_12 is a CC buffer Q_11 is a CE gain stage and Q_12 is a diode-connected transistor to adjust the DC levelExplanation / Answer
A) Q1-Q4 ------> Differential CC-CB cascade input stage
NPN emitter follower pair Q1, Q2 that provide high input impedance
PNP common-base pair Q3, Q4 that eliminates the undesirable Miller effect
B) Q5-Q7 ------> Wilson current mirror active load for differential input stage
Wilson current mirror; its role is to convert the (differential) input current signal to a single-ended signal without the attendant 50% losses
C)Q11-Q12 -----> Q11 is a CE gain stage and Q12 is a CC buffer
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