Draw the cascade connection of two amplifiers. Wri

Perform an ac analysis. Represent the amplifier by its ac equivalent circuit and discuss the input resistance at the base and the output resistance. (You can draw the circuit by hand on paper and can paste the image)

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

Hand Calculation: Since you now have the values of R1 and R2 resistors, obtain numeric value of voltage gain Av=Vo/Vi, and numerical values of input and output resistances Ri and Ro. Note that you need to DC analysis first. Do a hand calculation and calculate the DC collector current or IC. This is needed in order to calculate the small signal parameters gm and rπ and in turn to obtain the Av , Ri and Ro Hence, first perform a DC analysis (use the circuit in Figure 1 and take all capacitors open) and assume your transistor has a β=140.

What is mean by operational amplifier? Derive the input/output relationship in inverting and non-inverting amplifier.

Why do we need 3 types of cascaded amplifiers?

An operational amplifier consisting of three cascaded stages has a voltage gain of 3500. The gain of the first two stages is known to be -5 and -900. What is the voltage gain of the last stage and which type of MOSFET amplifier would you prefer for this stage?

Design an inverting amplifier of voltage gain of 100 .also draw it's circuit diagram

1. By using re model, draw the a.c. equalent circuit for the transistor amplifier shown in figure 1 Figure 1 i. ii. iii. iv. "Î Figure 2 R₁ C₁ V₁ R₂ 2. By using equalent circuit mention in 'part 1'. Write the mathematical expressions for followings, www m input impedence of the amplifier output impedance of the amplifier voltage gain of the amplifier current gain of the amplifier 3. By using h-parameter model, draw the a.c. equalent circuit for the transistor amplifier shown in figure 2. Assume that hre= high (∞), hoe = 0 and the rectance of capacitors C₁, C₂ and C3 is zero. Vcc Rc R₁ C₁ VBE RE R₂ +₁. Vcc Rc RE: C₂ C₂ Vo Vo R₁ R₂ Rc RE hie hfe = 38 ΚΩ = 10 ΚΩ = 4.7 ΚΩ = 2.2 kΩ = 1kΩ = 50

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