The operational amplifiers shown above have the following open loop gains: A01 = 1000 V/V A02 = 500 V/V A03 = 100 V/V a) Select values for Rı through Rs to produce the following nominal gains: AN1 = 26 V/V AN2 = 1 V/V AN3 = -20V/V b) Calculate the total closed loop gain of the amplifier. c) If vi = 0.25V, select a value for R9 in units of ohms, that would deliver an output power of 60mW.

3. Amplifier: (a) Which type of amplifier is shown in the figure on the right? What are its proper- ties? What is the condition for U? Name one pratical application for this type of amplifier. (b) Calculate the input impedance of the am- plifier shown in the figure. U R

4) Below is the small signal model of a multistage amplifier. Using this model, write the equationsthat you would need to determine the voltagegain. IMPORTANT: You only need to providethe equations that you would need to determinethe voltage gain. You DO NOT need to combine and simplify the equationsto determine a final expression for the voltagegain. Vin Vo Vb vo1 Rb R13 Vbe1 Vbe2 'e gm 1 Vbe1 gm 2 Vbe2 Rc2 Rc1 Re

How did they get case 1 and case 2 and simplify break down for a dummy?