### Identify the stages and describe the operation

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##### Reference no: EM131669690

Question 1. Determine the voltage VO in the circuit of FIGURE 1 for:

(a) β = 50, VBE = 0.7 V

(b) β = 250, VBE = 0.7 V.

Fig 1

Comment on the significance of your result.

 VS 12 V RC 1 kΩ RE 200Ω RB1 15 kΩ RB2 3.3 kΩ

Question 2. State the effects of negative feedback, when applied in a voltage amplifier, upon:

- the overall amplification

- variations in transistor gain

- non-linearity

- output impedance.

Question 3. Estimate the power developed in the 8 ? speaker of the circuit of FIGURE 2 for a 1 kHz sinusoidal input signal of 100 mV peak. All capacitors may be assumed to act as a short circuit at the frequency of operation.

Compare your estimate with that derived from a PSpice simulation.

[A Simetrix version of the circuit can be downloaded from the module's Learning Materials on BlackBoard.]

Fig 2.

Question 4. FIGURE 3 shows the circuit of a multistage amplifier. Identify the stages and describe the operation and principle features of the amplifier. You should also make an estimate of the maximum output current of the amplifier.

Fig 4.

Question 5. FIGURE 4 shows an amplifier circuit. operation and performance of the circuit. should:

Write a short report on the In completing the report you

- Explain the operation of the circuit and in particular the role of resistors R1 and R2.

- Build the circuit in PSpice and use it to determine:

(i) the quiescent value of Vout.

(ii) the voltage gain for a 100 mV, 1 kHz , input signal.

- Sketch the small-signal equivalent circuit of the amplifier and use it to estimate the voltage gain. Compare your answer with that of (ii) above.

- Attempt to calculate the quiescent value of Vout. Compare your answer with that given by the PSpice model. Try to explain any discrepancies.

[Hint : Apply the appropriate equation (1 or 2) of Lesson 4.]

Fig 4.

N.B The parameters used by Simetrix for the transistor model can be obtained in the Schematic Command window. Use the function key F11 to reveal this window. But first import the description of the model by selecting from the menu bar;

Simulator/Import Models.../Import direct copy.

Note also that VP = VTO and IDSS = β × VP2 .

Verified Expert

In this assignment ,the electronic circuit design was analyzed mathematically and practically. How a circuit is built for a specific use ,how is a datasheet is used to get the required information . Lastly when the circuits are built analytically, it is tested in simulation software to get the exact idea how the actual circuit will behave.

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### Reviews

#### urv1669690

11/19/2018 11:39:06 PM

The received assignment was as per my requirement and the rate of plagiarism was low. So, I would recommend this to my friends. Good job. I liked how the plagiarism was minimum. I only did minor review. Thanks Thank you for the solution....I needed a unique answer since I was having difficulty researching and finding the right info....thank you once again. Great work

#### len1669690

10/6/2017 1:00:47 AM

N.B The parameters used by Simetrix for the transistor model can be obtained in the Schematic Command window. Use the function key F11 to reveal this window. But first import the description of the model by selecting from the menu bar; Simulator/Import Models…/Import direct copy.

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