calculation for 741 opamp

[Usama Siddiqui]

i m stuck in finding some sound knowledge about how to calculate input output resistance of different stages and from which point?? also when to include early resistance and when not?? help me out plz

 

[chuckey]

if you are talking about the standard opamp circuit. Input via a resistor (Ri) to the negative input with a resistor also from this point to the output (Rf). The input impedance is Ri, the output impedance is the actual output impedance of the opamp (100 ohms) divided by the gain of the circuit ( Rf/Ri).
Frank

 

[Usama Siddiqui]

thanku sir for ur concern,actually i meant the stages precisely,am actually unable to determine the input and output resistance of each stage,like what transistors shud i pick up that are included in dat stage and what wud be its input from which transistor and how.basically the proper concept of input and output resistance

- - - Updated - - -

if you are talking about the standard opamp circuit. Input via a resistor (Ri) to the negative input with a resistor also from this point to the output (Rf). The input impedance is Ri, the output impedance is the actual output impedance of the opamp (100 ohms) divided by the gain of the circuit ( Rf/Ri).
Frank

no sirrrrr not the standard one,i mean the actual one.

 

[chuckey]

See :- https://www.ti.com/lit/ds/symlink/lm741.pdf Ri ~1 M, Iosc ~10 mA @12V = 1.2K

Frank

 

[Usama Siddiqui]

See :- https://www.ti.com/lit/ds/symlink/lm741.pdf Ri ~1 M, Iosc ~10 mA @12V = 1.2K

Frank

bro i did look dat but thats not what i want i want the method of calculation,i wana learn the method to calculate not the formula directly