Question

Task 1: An amplifier is formed by cascading the two operational amplifier stages shown in Fig. T1. 47 kΩ 360 kΩ 10 kΩ 24 k2 Uo Figure T1: An amplifier is formed by cascading the two operational amplifier stages a) What are the voltage gain, input resistance, and output resistance for this amplifier, assuming the op-amps are ideal? (Insert your work, notes, and comments here) b) What are the voltage gain, input resistance, and output resistance for this amplifier , and output 200 Ω. assuming the op-amps have gain 105, input resistance 500 (Insert your work, notes, and comments here) c) Draw the new circuit and repeat part (a), assuming the ideal amplifiers are interchanged (Insert your work, notes, and comments here) d) Assuming the real amplifiers described in part (b) are interchanged, draw the new circuit and repeat the part (b), i.e. determine the voltage gain, input resistance, and output resistance for this modified amplifier (Insert your work, notes, and comments here)

Answer 1

Ans:

360 k2 10 k92 Uo

The closed Loop Voltage gain (Av) of Inverting Amplifier is

Vout Rf Vin Rin

• so, Voltage gain of first amplifier is Av = -47/10 = -4.7
• Output Voltage of the first Amplifier = -4.7 x V1
• Similarly, Overall Voltage Gain = -360/24 = -15

Input Resistance:

As Per the Formula

iv.IR

After substituting R1 value in above equation Rin Value will be equals to 10KΩ

Output Resistance:

For Ideal operation Amplifier Out Resistance is Zero.