dzafar
Member level 4
Hi!
I am trying to understand the "purpose" of different transistors in LM741. In the figure below,
- I understand that Q1 and Q2 form a differential pair.
- Q5, Q6 along with R1 and R2 for the resistor-ratioed current mirror. I am guessing their function is to act as load. Is that correct?
- Q7 is the base current compensating transistor, added to reduce mismatch. Is that correct?
- R3, the current shunting resistor, is to make Q7 operate at the same current as Q5 and Q6.
- Question 1: Is Q8 the biasing transistor?
- Question 2: What does Q3 and Q4 do?
Thanks for all the help
I am trying to understand the "purpose" of different transistors in LM741. In the figure below,
- I understand that Q1 and Q2 form a differential pair.
- Q5, Q6 along with R1 and R2 for the resistor-ratioed current mirror. I am guessing their function is to act as load. Is that correct?
- Q7 is the base current compensating transistor, added to reduce mismatch. Is that correct?
- R3, the current shunting resistor, is to make Q7 operate at the same current as Q5 and Q6.
- Question 1: Is Q8 the biasing transistor?
- Question 2: What does Q3 and Q4 do?
Thanks for all the help