Which of the following is one of the classification groups of amplifiers? 1. Low frequency amplifiers II. Narrow frequency amplifiers III. Radio frequency amplifiers Please choose one: a. I, II, III b. Lonely II C. Lonely I d. I,ll E.  I,III

Identify the types of power amplifiers used to amplify low-level AM signals. (Check all that apply.) Class C amplifier Class D amplifier Class A amplifier Class B amplifier Linear amplifier

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

What are resistors for?  What are capacitors for?   What are transistors for? What are Operational amplifiers for?  What are oscilloscope for?