28.6 ΚΩ 20 ΚΩ +15 V 20 ΚΩ • 3 ΚΩ 2.3 ΚΩ Q₁ Q2 Q4 Q5 Q7 Q3 Q6 Q9 4X 15.7 ΚΩ -15 V w Q8 • 3 ΚΩ
2. For the OPAMP below:
g) Grounding the inputs, perform a DC analysis (assume beta is infinite and VBE=0.7V and neglect the early voltage),
calculate the DC currents and voltages everywhere in the circuit (all the collector and emitter currents and voltages as
well as the output voltage). Note that Q4 is 4 times as big as Q9 and Q3
h) If Q1 and Q2 have a beta of 100, calculate the input bias current to the opamp
i) What is the input common mode range of this opamp?
j) Calculate the common mode gain if the early voltage of Q3 and Q6 is 50V
k) Calculate the differential gain vo/vid of this circuit
I) Calculate the input and output impedance of the opamp assuming beta is 100
m) Calculate the input referred offset (Vos) if R2=21K
Step by step
Solved in 2 steps
