Week 7 - Model-Based Systems Engineering

         For this week, we were given a task to complete a tutorial on CE BJT small-signal amplifier. The tutorial is divided into 3 steps. Step 1 is to calculate the dc and ac characteristics of the amplifier in the figure given. Step 2 is to produce an alternative analog design, using op-amps as a solution. For the final step, we do not have to do it yet. 



        For step 1, we did simulation using multisim software and compare the result with our calculation. Below shows the calculation and simulation result.

                Simulation result for dc characteristics:


                Calculation for dc characteristics:

                    
                    Calculation for ac characteristic:

    

        For step 2, we discuss to produce the alternate analog design of step 1 using op-amp. Below shows the circuit, wave, and values that are obtained.

            Original:
 

           
            VCEQ




        Modified circuit:

    VCEQ




Conclusion:

            We switched from NPN to PNP transistors. Both of the transistors is to amplify the signal. The difference between NPN and PNP is the NPN transistor is amplifying a positive signal by allowing the larger current to flow from collector to emitter. In contrast, the PNP transistor is to allow current flow from emitter to collector. We also convert the value of the resistor to low and the capacitor to a slightly higher value. We also change the VPP to evaluate the graph produced. There is a not so significant change to the value of VCEQ. But we can only see the changes from the graph. There is an increased value of the gain when the value of VPP is increased.




Comments

  1. ZackNQuackMarch 23, 2021 at 10:51 PM

    Good attempt, however, we need to use op-amp as solution. Is there any improvements? Note down in minute of meetings.

    ReplyDelete

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