Lab 1

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Texas A&M University *

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326

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Electrical Engineering

Date

Apr 3, 2024

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docx

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8

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Lab 1: Design of a Common-Emitter BJT Amplifier Course: ECEN 326-501 Name: Parth Grover UIN: 631003546 Introduction The lab consisted of designing a single stage common emitter BJT amplifier and measuring certain values. The design of the lab was completed as a pre-lab which was submitted to the TA prior to the lab starting. Procedure The circuit built during the lab was figure 1 in the lab 1 manual. After building the amplifier, values such as Ic, Ve, Vc, Vb, Isupply, Av, Rin, and Rout were calculated and checked if they matched with what was simulated in the pre-lab. Measurements Calculated Simulated Measured Vb N/A 1.61 V 1.642 V Vc N/A 2.89 V 2.826 V Ve 1 V 964 mV 1.004 V Ic 0.587 mA 561 mA 580 mA Av 40 V/V 37.2707 V/V 31.9 dB = 39.72 V/V Rin 5 6.725 7.420 Rout N/A 2.730 5.950 Isupply 1.5 mA 0.623 mA 0.639 mA Maximum unclipped output signal amplitude N/A 42 mV 50 mV Input signal amplitude resulting 5% THD N/A 13.1 mV 20 mV
Figure 1: Vb DC voltage
Figure 2: Vc DC voltage
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Figure 3: Ve DC voltage
Figure 4: Gain (dB) of the circuit
Figure 5: Rin gain
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Figure 6: Amplitude of input voltage for 5% THD Discussion The DC values that I assumed and simulated matched with what I got as I measured during the lab. Also, the gain I got was within a reasonable range. My magnitude for the input voltage for 5% THD is higher than my simulated because the oscilloscope can only go down to a minimum of 20mV. For my output resistance, my measured value did not match up with the simulated value. There could be couple of reasons for that as my simulation model could not have been accurate. It could also just be that the measurement technique I used introduced some unknown
errors. Lastly, I did not include in the plots my maximum unclipped output voltage and Rout gain as I forgot to take a screenshot of those graphs. However, I showed my work to the TA when presenting her with my results at the end.