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it is hard to tell based on simplified schematics of ICs. You have to remember that it is much harder to produce a resistor than a transistor in an IC so those "resistors" you see in those simplified schematics are likely transistors.
For example, in the 1875 schematic, Q9 and Q11 are transistors that function like a resistor.
the work flow for 1875 is quite similar to others: Q4/Q5 form a differential pair, driving into a current mirror (Q7/Q8). Q10 is the voltage amplification stage, buffered by Q30. Q30 is isolated from the Output stage via a current mirror (Q32/Q33). |
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